相較於 GeForce RTX 4080,這次 Radeon RX 7900 XTX 表現亮眼許多。

12 月 8 日晚上 Radeon RX 7900 XT 與 Radeon RX 7900 XTX 外觀正式解禁,但台灣部分因為一些技術問題,沒有在這波名單中,但我們也已經在進行相關顯示卡的實測。

這次 RDNA 3 架構的 Radeon RX 7900 系列顯示卡是首度採用 Chiplet 設計的 Gaming GPU。

在設計上,Radeon RX 7900 系列 GPU 採用的是代號 Navi 31 的產品,其 GPU 是由 1x GPU 與 6x MCD 所組成,採用 2nd Gen 的 AMD Infinity Cache 技術,讓資料可以在 5.3TB/s 的頻寬下進行高速傳輸。除了 2nd Gen Infinity Cache 技術,RDNA 3 還整合了全新的 AI 加速器、2nd Gen RT 加速器以及全新的 AMD Radiance Display Engine。

AMD 在 Reviewer Guide 中提到 3 款顯示卡的 Infinity Cache 數據:

– Radeon RX 6950 XT:128MB 1st Gen Infinity Cache,18Gbps GDDR6 記憶體與 256 bit 記憶體匯流排,提供 1793.5 GB/s 頻寬;

– Radeon RX 7900 XT:80MB 2nd Gen Infinity Cache,20Gbps GDDR6 記憶體與 320 bit 記憶體匯流排,提供 2912 GB/s 頻寬;

– Radeon RX 7900 XTX:96MB 2nd Gen Infinity Cache,20Gbps GDDR6 記憶體與 384 記憶體匯流排,提供 3494.4 GB/s 頻寬;

RDNA 3 架構的 Radeon RX 7000 系列還擁有針對 AV1 編碼與解碼用的硬體加速引擎,讓顯示卡可以支援 8K60 的高畫質。

VP9H.264H.265AV1
Decode4K210
8K48
(4:2:0 8 / 10b)
4K330
(4:2:0 8b)
4K210
8K48
(4:2:0 8 / 10b)
4K240
8K60
(4:2:0 8 / 10 / 12b)
Encode--4K180
(4:2:0 8b)
4K180
8K48
(4:2:0 8 / 10b)
4K240
8K60
(4:2:0 8 / 10b)

至於 AMD Radiance Display Engine 主要就是 Radeon RX 7900 系列顯示卡加入了 DisplayPort 2.1,透過其 54Gbps 的頻寬,讓顯示卡可以輸出 8K 165Hz 或 4K 480Hz 的影像;如果是 DisplayPort 1.4 的話,至多只能達到 8K 60Hz 或 4K 240Hz。

Radeon RX 6950 XT
Radeon RX 7900 Series
DisplayPort VersionDisplayPort 1.4DisplayPort 2.1
Refresh Rate - 1440p(Max)480Hz900Hz
Refresh Rate - 4K(Max)240Hz480Hz
Refresh Rate - 8K(Max)60Hz
165Hz

現階段我們仍未見到任何支援 DisplayPort 2.1 的螢幕,但就 AMD 在發表會提到的,預計在 2023 年初,我們將可以見到不少品牌推出相關螢幕。

Radeon RX 6950 XTRadeon RX 7900 XT
Radeon RX 7900 XTX
Architecture
RDNA 2RDNA 3RDNA 3
Process7nm5nm GCD + 6nm MCD5nm GCD + 6nm MCD
Transistor Count26.8b57.7b57.7b
Die Size520mm2300mm2 GCD
220mm2 MCD
300mm2 GCD
220mm2 MCD
Compute Units
808496
Ray Accelerators
808496
AI Accelerators-168 192
Stream Processors512053766144
Game GPU Clock2100MHz2000MHz2300MHz
Boost GPU ClockUp to 2310MHzUp to 2400MHz
Up to 2500MHz
ROPs128192192
AMD Infinity Cache128MB80MB96MB
Memory16GB GDDR6
20GB GDDR6
24GB GDDR6
Effective Memory Bandwidth with AMD Infinity CacheUp to 1793.5GB/sUp to 2900GB/sUp to 3500GB/s
Memory Bus Interface256 bit320 bit384 bit
PCIe InterfacePCIe 4.0 x16PCIe 4.0 x16PCIe 4.0 x16
Board Power(TBP)335W315W355W

AMD Radeon RX 7900 XTX 的整體功耗(Total Board Power, TBP)為 355W,建議搭配 800W 的電源供應器;Radeon RX 7900 XT 的整體功耗(Total Board Power, TBP)為 315W,建議搭配 750W 的電源供應器。

就數字來看,AMD Radeon RX 7900 XTX 的功耗是高於 NVIDIA GeForce RTX 4080 的 320W(Total Graphics Power, TGP);雖然 Radeon RX 7900 XT 稍微低於 GeForce RTX 4080,但某個程度來說,這樣可以算是打成平手,或者是在同一個區間內。

說了那麼多,來看看 AMD Radeon RX 7900 XTX 與 Radeon RX 7900 XT 顯示卡。

實際上 2 張顯示卡並不是同一張 PCB,因為 Radeon RX 7900 XT 整體要比 Radeon RX 7900 XTX 小,為何 AMD 不放 2 款顯示卡採用相同 PCB,這樣共用散熱模組的前提下,也許就能省下不少時間與成本。

AMD Radeon RX 7900 XTX

radeon rx 7900 xtx_1
radeon rx 7900 xtx_2
radeon rx 7900 xtx_3
radeon rx 7900 xtx_4
radeon rx 7900 xtx_6
radeon rx 7900 xtx_5
radeon rx 7900 xtx_7
radeon rx 7900 xtx_8
radeon rx 7900 xtx_1 radeon rx 7900 xtx_2 radeon rx 7900 xtx_3 radeon rx 7900 xtx_4 radeon rx 7900 xtx_6 radeon rx 7900 xtx_5 radeon rx 7900 xtx_7 radeon rx 7900 xtx_8

AMD Radeon RX 7900 XT

radeon rx 7900 xt_1
radeon rx 7900 xt_2
radeon rx 7900 xt_3
radeon rx 7900 xt_4
radeon rx 7900 xt_5
radeon rx 7900 xt_6
radeon rx 7900 xt_7
radeon rx 7900 xt_1 radeon rx 7900 xt_2 radeon rx 7900 xt_3 radeon rx 7900 xt_4 radeon rx 7900 xt_5 radeon rx 7900 xt_6 radeon rx 7900 xt_7

MBA(Made By AMD)版本的 AMD Radeon RX 7900 系列顯示卡在 I/O 部分加入 USB-C,方便使用者透過 USB-C 傳出線輸出訊號至擁有 USB-C 的螢幕。至於各 AIB 的自製卡部分,可能都會將 USB-C 移除,更換為 DisplayPort 供使用。

NVIDIA 從 GeForce RTX 3090 Ti 開始強制使用 12VHPWR(12 + 4 Pin)接頭,AMD 這裡依舊保留了 PCIe 8 Pin。

某程度來說,AMD 雖然較為保守,但在不需要更換電源供應器,也不需要額外的轉接線的情況下,這樣的作法對於大部分使用者來說,確是件相當不錯的事情。

Radeon RX 7900 XTX 散熱器具有發光功能,而 Radeon RX 7900 XT 則沒有。

以 999 美元的訂價,很明顯這次 AMD Radeon RX 7900 XT 就是鎖定 1,190 美元的 NVIDIA GeForce RTX 4080,至於 899 美元的 Radeon RX 7900 XT 則是鎖定原本命名為 GeForce RTX 4080 12GB,但現在更名為 GeForce RTX 4070 Ti 的顯示卡。

不過,現階段 GeForce RTX 4070 Ti 尚未正式發表,因此數據上沒有辦法提供讓大家參考。

針對 Radeon RX 7900 系列顯示卡的實測,我們使用 AMD Ryzen 9 7900X 搭配 DDR5-6000 MT/s 記憶體進行;顯示卡部分包含 Radeon RX 7900 XTX、Radeon RX 7900 XT、Radeon RX 6950 XT 與 NVIDIA GeForce RTX 4080。

一開始當然就是來看看 4 張顯示卡在 3DMark 的各項數據。

Radeon RX 7900 XTX vs Radeon RX 6950 XT:

3DMarkRadeon RX 6950 XTRadeon RX 7900 XTX
TIme Spy198912563622.410%
Graphic score207512889728.190%
CPU score1611215638-3.031%
Time Spy Extreme102501352224.198%
Graphic score102761436628.470%
CPU score10109101480.384%
Fire Strike456285162611.618%
Graphic score605187690421.307%
Physics score4211741545-1.377%
Combo score1677416647-0.763%
Fire Strike Extreme281713508819.713%
Graphic score297073936524.534%
Physics score4208741376-1.718%
Combo score149571717712.924%
Fire Strike Ultra148451990625.424%
Graphic score148282007026.119%
Physics score4219841663-1.284%
Combo score75611079329.945%
Port Royal103331552233.430%
Ray Tracing28.1748.8442.322%
Speed Way3816576933.853%
PCIE bandwidth27.4326.42-3.823%

Radeon RX 7900 XT vs Radeon RX 6950 XT:

3DMarkRadeon RX 6950 XTRadeon RX 7900 XT
TIme Spy198912294413.306%
Graphic score207512507417.241%
CPU score1611215489-4.022%
Time Spy Extreme102501184513.466%
Graphic score102761220315.791%
CPU score10109101600.502%
Fire Strike45628482335.401%
Graphic score605186837711.494%
Physics score4211741969-0.353%
Combo score1677416214-3.454%
Fire Strike Extreme28171307788.470%
Graphic score297073345811.211%
Physics score4208741586-1.205%
Combo score14957154623.266%
Fire Strike Ultra148451684611.878%
Graphic score148281688712.193%
Physics score4219841542-1.579%
Combo score7561882214.294%
Port Royal103331326322.092%
Ray Tracing28.1740.9631.226%
Speed Way3816485721.433%
PCIE bandwidth27.4326.29-4.336%

Radeon RX 7900 XTX vs GeForce RTX 4080:

3DMarkGeForce RTX 4080Radeon RX 7900 XTX
Time Spy25291256361.346%
Graphic score27958288973.249%
CPU score1641815638-4.988%
Time Spy Extreme13167135222.625%
Graphic score13921143663.098%
CPU score10078101480.690%
Fire Strike453715162612.116%
Graphic score619837690419.402%
Physics score41245415450.722%
Combo score15864166474.704%
Fire Strike Extreme308563508812.061%
Graphic score326633936517.025%
Physics score4255941376-2.859%
Combo score16888171771.682%
Fire Strike Ultra171991990613.599%
Graphic score169452007015.571%
Physics score4259441663-2.235%
Combo score96531079310.562%
Port Royal1781915522-14.798%
Ray Tracing84.3648.84-72.727%
Speed Way70995769-23.054%
PCIE bandwidth26.8226.42-1.514%

Radeon RX 7900 XT vs GeForce RTX 4080:

3DMarkGeForce RTX 4080Radeon RX 7900 XT
TIme Spy2529122944-10.229%
Graphic score2795825074-11.502%
CPU score1641815489-5.998%
Time Spy Extreme1316711845-11.161%
Graphic score1392112203-14.079%
CPU score10078101600.807%
Fire Strike45371482335.934%
Graphic score61983683779.351%
Physics score41245419691.725%
Combo score15864162142.159%
Fire Strike Extreme3085630778-0.253%
Graphic score32663334582.376%
Physics score4255941586-2.340%
Combo score1688815462-9.223%
Fire Strike Ultra1719916846-2.095%
Graphic score1694516887-0.343%
Physics score4259441542-2.532%
Combo score96538822-9.420%
Port Royal1781913263-34.351%
Ray Tracing84.3640.96-105.957%
Speed Way70994857-46.160%
PCIE bandwidth26.8226.29-2.016%

Radeon RX 7900 XTX vs Radeon RX 7900 XT:

3DMarkRadeon RX 7900 XTRadeon RX 7900 XTX
TIme Spy229442563610.501%
Graphic score250742889713.230%
CPU score15489156380.953%
Time Spy Extreme118451352212.402%
Graphic score122031436615.056%
CPU score1016010148-0.118%
Fire Strike48233516266.572%
Graphic score683777690411.088%
Physics score4196941545-1.021%
Combo score16214166472.601%
Fire Strike Extreme307783508812.283%
Graphic score334583936515.006%
Physics score4158641376-0.508%
Combo score15462171779.984%
Fire Strike Ultra168461990615.372%
Graphic score168872007015.859%
Physics score41542416630.290%
Combo score88221079318.262%
Port Royal132631552214.554%
Ray Tracing40.9648.8416.134%
Speed Way4857576915.809%
PCIE bandwidth26.2926.420.492%

跟著就是 4 款顯示卡在 4K 解析度下的各遊戲表現。

Radeon RX 7900 XTX vs Radeon RX 6950 XT:

4K gamingRadeon RX 6950 XTRadeon RX 7900 XTX
Assassin Creed Vahalla7910222.549%
Borderlands 3 : bad ass73.78105.3329.953%
Cyberpunk207743.5868.0835.987%
Cyberpunk2077 +RT12.9720.436.422%
Cyberpunk2077 +RT+DLSS3/FSR Performance43.2256.3923.355%
Tom Clancy’s The Division 27911229.464%
Metro Exodus75.54100.0824.520%
Metro Exodus(RT_high)42.4558.2627.137%
F1 2214819624.490%
F1 22 (Ray Tracing_Ultra_high)355536.364%
F1 22 (Ray Tracing+DLSS_Quality)8111328.319%
Far Cry 69212325.203%
Forza Horzion 5 (Extreme/RT off)10211813.559%
Forza Horzion 5 (Extreme/RT ON)9010514.286%
Horizon Zero Dawn9111722.222%
Rainbow Six Siege32939717.128%
Shadow of the Tomb Raider (highest)9612925.581%
SpiderMan Miles Moral (Very High)6288.730.101%
SpiderMan Miles Moral (Very High + RT)263627.778%
SpiderMan Miles Moral (Very High + RT+ DLSS/FSR Perf)-75.6-
Total War: Troy98.313426.642%
WarHammer Darktide(High)46.265.729.680%
Watch Dog Legion689629.167%
Watch Dog Legion(RT_Ultra)263933.333%

Radeon RX 7900 XT vs Radeon RX 6950 XT:

4K gamingRadeon RX 6950 XTRadeon RX 7900 XT
Assassin Creed Vahalla79879.195%
Borderlands 3 : bad ass73.7888.5116.642%
Cyberpunk207743.5857.9824.836%
Cyberpunk2077 +RT12.9717.0724.019%
Cyberpunk2077 +RT+DLSS3/FSR Performance43.2249.5512.775%
Tom Clancy’s The Division 2799315.054%
Metro Exodus75.5488.3614.509%
Metro Exodus(RT_high)42.4548.7912.994%
F1 221481618.075%
F1 22 (Ray Tracing_Ultra_high)354623.913%
F1 22 (Ray Tracing+DLSS_Quality)819817.347%
Far Cry 69210512.381%
Far Cry 6 (RT)768914.607%
Forza Horzion 5 (Extreme/RT off)1021030.971%
Forza Horzion 5 (Extreme/RT ON)90922.174%
Horizon Zero Dawn91976.186%
Rainbow Six Siege32937011.081%
Shadow of the Tomb Raider (highest)9610811.111%
Shadow of the Tomb Raider (RT)556515.385%
SpiderMan Miles Moral (Very High)6280.422.886%
SpiderMan Miles Moral (Very High + RT)2628.79.408%
SpiderMan Miles Moral (Very High + RT+ DLSS/FSR Perf)-63.4-
Total War: Troy98.3116.415.550%
WarHammer Darktide(High)46.255.116.152%
Watch Dog Legion688217.073%
Watch Dog Legion(RT_Ultra)263321.212%

Radeon RX 7900 XTX vs GeForce RTX 4080:

4K gamingGeForce RTX 4080Radeon RX 7900 XTX
Assassin Creed Vahalla951026.863%
Borderlands 3 : bad ass90.22105.3314.345%
Cyberpunk207764.868.084.818%
Cyberpunk2077 +RT30.8120.4-51.029%
Cyberpunk2077 +RT+DLSS3/FSR Performance83.3156.39-47.739%
Tom Clancy’s The Division 2115112-2.679%
Metro Exodus104.33100.08-4.247%
Metro Exodus(RT_high)74.9358.26-28.613%
F1 2216219617.347%
F1 22 (Ray Tracing_Ultra_high)6155-10.909%
F1 22 (Ray Tracing+DLSS_Quality)10011311.504%
Far Cry 611012310.569%
Far Cry 6 (RT)961047.692%
Forza Horzion 5 (Extreme/RT off)121118-2.542%
Forza Horzion 5 (Extreme/RT ON)112105-6.667%
Horizon Zero Dawn1171170.000%
Rainbow Six Siege410397-3.275%
Shadow of the Tomb Raider (highest)134129-3.876%
Shadow of the Tomb Raider (RT)8877-14.286%
SpiderMan Miles Moral (Very High)103.488.7-16.573%
SpiderMan Miles Moral (Very High + RT)49.736-187.222%
SpiderMan Miles Moral (Very High + RT+ DLSS/FSR Perf)109.875.634.259%
Total War: Troy118.713418.060%
WarHammer Darktide(High)65.765.7-80.670%
Watch Dog Legion879631.563%
Watch Dog Legion(RT_Ultra)4639-123.077%

Radeon RX 7900 XT vs GeForce RTX 4080:

4K gamingGeForce RTX 4080Radeon RX 7900 XT
Assassin Creed Vahalla9587-9.195%
Borderlands 3 : bad ass90.2288.51-1.932%
Cyberpunk207764.857.98-11.763%
Cyberpunk2077 +RT30.8117.07-80.492%
Cyberpunk2077 +RT+DLSS3/FSR Performance83.3149.55-68.133%
Tom Clancy’s The Division 211593-23.656%
Metro Exodus104.3388.36-18.074%
Metro Exodus(RT_high)74.9348.79-53.577%
F1 22162161-0.621%
F1 22 (Ray Tracing_Ultra_high)6146-32.609%
F1 22 (Ray Tracing+DLSS_Quality)10098-2.041%
Far Cry 6110105-4.762%
Far Cry 6 (RT)9689-7.865%
Forza Horzion 5 (Extreme/RT off)121103-17.476%
Forza Horzion 5 (Extreme/RT ON)11292-21.739%
Horizon Zero Dawn11797-20.619%
Rainbow Six Siege410370-10.811%
Shadow of the Tomb Raider (highest)134108-24.074%
Shadow of the Tomb Raider (RT)8865-35.385%
SpiderMan Miles Moral (Very High)103.480.4-28.607%
SpiderMan Miles Moral (Very High + RT)49.728.7-73.171%
SpiderMan Miles Moral (Very High + RT+ DLSS/FSR Perf)109.863.4-73.186%
Total War: Troy118.7116.4-1.976%
WarHammer Darktide(High)65.755.1-19.238%
Watch Dog Legion8782-6.098%
Watch Dog Legion(RT_Ultra)4633-39.394%

Radeon RX 7900 XTX vs Radeon RX 7900 XT:

4K gamingGeForce RTX 4080Radeon RX 7900 XTX
Assassin Creed Vahalla951026.863%
Borderlands 3 : bad ass90.22105.3314.345%
Cyberpunk207764.868.084.818%
Cyberpunk2077 +RT30.8120.4-51.029%
Cyberpunk2077 +RT+DLSS3/FSR Performance83.3156.39-47.739%
Tom Clancy’s The Division 2115112-2.679%
Metro Exodus104.33100.08-4.247%
Metro Exodus(RT_high)74.9358.26-28.613%
F1 2216219617.347%
F1 22 (Ray Tracing_Ultra_high)6155-10.909%
F1 22 (Ray Tracing+DLSS_Quality)10011311.504%
Far Cry 611012310.569%
Far Cry 6 (RT)961047.692%
Forza Horzion 5 (Extreme/RT off)121118-2.542%
Forza Horzion 5 (Extreme/RT ON)112105-6.667%
Horizon Zero Dawn1171170.000%
Rainbow Six Siege410397-3.275%
Shadow of the Tomb Raider (highest)134129-3.876%
Shadow of the Tomb Raider (RT)8877-14.286%
SpiderMan Miles Moral (Very High)103.488.7-16.573%
SpiderMan Miles Moral (Very High + RT)49.736-187.222%
SpiderMan Miles Moral (Very High + RT+ DLSS/FSR Perf)109.875.634.259%
Total War: Troy118.713418.060%
WarHammer Darktide(High)65.765.7-80.670%
Watch Dog Legion879631.563%
Watch Dog Legion(RT_Ultra)4639-123.077%

最後的遊戲測試則是在 2K 解析度下進行,這可能也是大部分使用此級別顯示卡玩家會選擇的解析度。

Radeon RX 7900 XTX vs Radeon RX 6950 XT:

2K GamingRadeon RX 6950 XTRadeon RX 7900 XTX
Assassin Creed Vahalla13616718.563%
Borderlands 3 : bad ass140.05201.530.496%
Cyberpunk207775.57133.8643.545%
Cyberpunk2077 +RT28.0541.5332.458%
Cyberpunk2077 +RT+DLSS3/FSR Performance75.4492.5118.452%
Tom Clancy’s The Division 215020326.108%
Metro Exodus118.15152.4922.520%
Metro Exodus(RT_high)77.47105.9926.908%
F1 222512717.380%
F1 22 (Ray Tracing_Ultra_high)7310429.808%
F1 22 (Ray Tracing+DLSS_Quality)14416613.253%
Far Cry 614215910.692%
Far Cry 6 (RT)1191308.462%
Forza Horzion 5 (Extreme/RT off)1421505.333%
Forza Horzion 5 (Extreme/RT ON)1271355.926%
Horizon Zero Dawn17520213.366%
Rainbow Six Siege59571016.197%
Shadow of the Tomb Raider (highest)18123322.318%
Shadow of the Tomb Raider (RT)10214228.169%
SpiderMan Miles Moral (Very High)92.412324.878%
SpiderMan Miles Moral (Very High + RT)456429.688%
Total War: Troy186234.720.750%
WarHammer Darktide(High)91134.532.342%
Watch Dog Legion11014624.658%
Watch Dog Legion(RT_Ultra)507432.432%

Radeon RX 7900 XT vs Radeon RX 6950 XT:

2K GamingRadeon RX 6950 XTRadeon RX 7900 XT
Assassin Creed Vahalla1361509.333%
Borderlands 3 : bad ass140.05165.2315.239%
Cyberpunk207775.57116.7635.277%
Cyberpunk2077 +RT28.0535.5621.119%
Cyberpunk2077 +RT+DLSS3/FSR Performance75.4483.149.261%
Tom Clancy’s The Division 215017514.286%
Metro Exodus118.15122.673.685%
Metro Exodus(RT_high)77.4787.3511.311%
F1 222512572.335%
F1 22 (Ray Tracing_Ultra_high)739119.780%
F1 22 (Ray Tracing+DLSS_Quality)1441588.861%
Far Cry 614216212.346%
Far Cry 6 (RT)11914015.000%
Forza Horzion 5 (Extreme/RT off)142135-5.185%
Forza Horzion 5 (Extreme/RT ON)127123-3.252%
Horizon Zero Dawn1751802.778%
Rainbow Six Siege5956254.800%
Shadow of the Tomb Raider (highest)18120511.707%
Shadow of the Tomb Raider (RT)10212317.073%
SpiderMan Miles Moral (Very High)92.4111.417.056%
SpiderMan Miles Moral (Very High + RT)455010.000%
Total War: Troy186208.610.834%
WarHammer Darktide(High)91107.415.270%
Watch Dog Legion11013619.118%
Watch Dog Legion(RT_Ultra)506523.077%

Radeon RX 7900 XTX vs GeForce RTX 4080:

2K GamingGeForce RTX 4080Radeon RX 7900 XTX
Assassin Creed Vahalla1531678.383%
Borderlands 3 : bad ass168.9201.516.179%
Cyberpunk2077132.69133.860.874%
Cyberpunk2077 +RT63.1541.53-52.059%
Cyberpunk2077 +RT+DLSS3/FSR Performance132.4692.51-43.185%
Tom Clancy’s The Division 2215203-5.911%
Metro Exodus153.8152.49-0.859%
Metro Exodus(RT_high)125.28105.99-18.200%
F1 2223127114.760%
F1 22 (Ray Tracing_Ultra_high)112104-7.692%
F1 22 (Ray Tracing+DLSS_Quality)1571665.422%
Far Cry 61541593.145%
Far Cry 6 (RT)1211306.923%
Forza Horzion 5 (Extreme/RT off)157150-4.667%
Forza Horzion 5 (Extreme/RT ON)146135-8.148%
Horizon Zero Dawn2012020.495%
Rainbow Six Siege7047100.845%
Shadow of the Tomb Raider (highest)240233-3.004%
Shadow of the Tomb Raider (RT)165142-16.197%
SpiderMan Miles Moral (Very High)158123-28.455%
SpiderMan Miles Moral (Very High + RT)90.864-41.875%
Total War: Troy203.1234.713.464%
WarHammer Darktide(High)125.2134.56.914%
Watch Dog Legion1321469.589%
Watch Dog Legion(RT_Ultra)8574-14.865%

Radeon RX 7900 XT vs GeForce RTX 4080:

2K GamingGeForce RTX 4080Radeon RX 7900 XT
Assassin Creed Vahalla153150-2.000%
Borderlands 3 : bad ass168.9165.23-2.221%
Cyberpunk2077132.69116.76-13.643%
Cyberpunk2077 +RT63.1535.56-77.587%
Cyberpunk2077 +RT+DLSS3/FSR Performance132.4683.14-59.322%
Tom Clancy’s The Division 2215175-22.857%
Metro Exodus153.8122.67-25.377%
Metro Exodus(RT_high)125.2887.35-43.423%
F1 2223125710.117%
F1 22 (Ray Tracing_Ultra_high)11291-23.077%
F1 22 (Ray Tracing+DLSS_Quality)1571580.633%
Far Cry 61541624.938%
Far Cry 6 (RT)12114013.571%
Forza Horzion 5 (Extreme/RT off)157135-16.296%
Forza Horzion 5 (Extreme/RT ON)146123-18.699%
Horizon Zero Dawn201180-11.667%
Rainbow Six Siege704625-12.640%
Shadow of the Tomb Raider (highest)240205-17.073%
Shadow of the Tomb Raider (RT)165123-34.146%
SpiderMan Miles Moral (Very High)158111.4-41.831%
SpiderMan Miles Moral (Very High + RT)90.850-81.600%
Total War: Troy203.1208.62.637%
WarHammer Darktide(High)125.2107.4-16.574%
Watch Dog Legion1321362.941%
Watch Dog Legion(RT_Ultra)8565-30.769%

Radeon RX 7900 XTX vs Radeon RX 7900 XT:

2K GamingRadeon RX 7900 XTRadeon RX 7900 XTX
Assassin Creed Vahalla15016710.180%
Borderlands 3 : bad ass165.23201.518.000%
Cyberpunk2077116.76133.8612.775%
Cyberpunk2077 +RT35.5641.5314.375%
Cyberpunk2077 +RT+DLSS3/FSR Performance83.1492.5110.129%
Tom Clancy’s The Division 217520313.793%
Metro Exodus122.67152.4919.555%
Metro Exodus(RT_high)87.35105.9917.587%
F1 222572715.166%
F1 22 (Ray Tracing_Ultra_high)9110412.500%
F1 22 (Ray Tracing+DLSS_Quality)1581664.819%
Far Cry 6162159-1.887%
Far Cry 6 (RT)140130-7.692%
Forza Horzion 5 (Extreme/RT off)13515010.000%
Forza Horzion 5 (Extreme/RT ON)1231358.889%
Horizon Zero Dawn18020210.891%
Rainbow Six Siege62571011.972%
Shadow of the Tomb Raider (highest)20523312.017%
Shadow of the Tomb Raider (RT)12314213.380%
SpiderMan Miles Moral (Very High)111.41239.431%
SpiderMan Miles Moral (Very High + RT)506421.875%
Total War: Troy208.6234.711.121%
WarHammer Darktide(High)107.4134.520.149%
Watch Dog Legion1361466.849%
Watch Dog Legion(RT_Ultra)657412.162%

針對 Radeon RX 7900 XTX、Radeon RX 7900 XT、Radeon RX 6950 XT 與 NVIDIA GeForce RTX 4080 在 3DMark、4K Gaming、4K Gaming with RT、2K Gaming 與 2K Gaming with RT 的數據比較,這裡彙整了 5 張曲線圖提供參考。

曲線圖部分,是以 Radeon RX 6950 XT 為基準點去設定。

3DMark 部分,不難發現 Radeon RX 7900 XTX 在 Time Spy 與 FireStrike 系列都領先 GeForce RTX 4080,但是在 Port Royal、Speed Way 與 Ray Tracing 部分都落後於 GeForce RTX 4080。

4K 遊戲方面,Radeon RX 7900 XTX 在我們測試的遊戲項目內,有著一定優勢,不過 GeForce RTX 4080 則是在 Tom Clancy‘s The Division 2、Forza Horizon 5、Rainbox Six Siege、Shadow of the Tomb Raider 和 SpiderMan Miles Moral 領先 Radeon RX 7900 XTX。

開啟 RT 的 4K 遊戲部分,Radeon RX 7900 XT 除了在 Far Cry 6 佔有一些優勢外,其他遊戲基本上都是 GeForce RTX 4080 的天下。

至於 2K 遊戲的話,我們遊戲測試項目共計 15 款,AMD Radeon RX 7900 XTX 領先 NVIDIA GeForce RTX 4080 有 11 款之多。

2K 解析度下開啟 RT 進行測試,AMD Radeon RX 7900 XTX 也只有在 Far Cry 6 一款遊戲領先 GeForce RTX 4080,這部分與 4K 解析度相同。大家,也可能注意到 Far Cry 6 遊戲下,AMD Radeon RX 7900 XT 的表現要比 Radeon RX 7900 XTX 佳,這部分可能是因為 CPU BOUND 的關係。

跟著來看看 Radeon RX 7900 XTX 與 Radeon RX 7900 XT 的待機、Furmark 與 F1 22 的功耗表現。

Radeon RX 7900 XTX 在 Furmark 條件下,TBP 平均可以達到 373.4W,至於 Radeon RX 7900 XT 則是 319.4W,這些數據都高於 AMD 官方提出的 355W 與 315W。

至於透過 NVIDIA PCAT 工具,Radeon RX 7900 XTX 與 Radeon RX 7900 XT 瞬間最大功耗分別可以來到 398W 與 349W.

在測試中,我們也發現了一個有趣的現象,也許用 BUG 稱之會更合適。Radeon RX 7900 系列顯示卡在 HDMI 2.1 條件下的待機功耗約在 30W 左右,但在使用 DisplayPort 的條件下,顯示卡的待機功耗則會突破 90 – 100W。

Radeon RX 7900 XTX with DisplayPort:

Radeon RX 7900 XTX with HDMI:

Radeon RX 7900 XT with DisplayPort:

Radeon RX 7900 XT with HDMI:

也許是顯示卡驅動尚未優化完成,希望 AMD 在未來的驅動更新可以將此問題解決。

無法與 Ada Lovelace 架構的旗艦產品 GeForce RTX 4090 抗衡,但給予 NVIDIA GeForce RTX 家族最多人選擇的高階卡一些壓力,對於整個市場是一件好事,特別是大家都覺得 NVIDIA 這次在 GeForce RTX 4080 的訂價偏高許多。

面對採用 Chiplet 設計的 RDNA 3 架構,NVIDIA GeForce RTX 4080 在部分遊戲是明顯落後 Radeon RX 7900 XTX,這也許會讓 NVIDIA 開始思考調整 GeForce RTX 4080 的售價,只是到目前為止都只是市場傳聞,NVIDIA 若真如此做,那就真的打破過往調整售價的步伐。

至於 Ray Tracing 部分,採用 RDNA 3 架構的 AMD Radeon RX 7900 系列確實有強化,但與 Ada Lovelace 架構相比較的話,很明顯還是落後不少,AMD 在這部分還有很大的努力空間。

另一方面,USB-C 的加入以及 DisplayPort 2.1 都算是一個相當不錯的加分功能。

Radeon RX 7900 XTX 確實與 GeForce RTX 4080 有著相當不錯的抗衡,不過功耗部分可能是一個弱點;至於 Radeon RX 7900 XT 要與 GeForce RTX 4070 Ti 或是 GeForce RTX 4070 比較後才能了解其定位是否正確。

不過以 899 美元的訂價,Radeon RX 7900 XT 效能應該與 GeForce RTX 4070 Ti 相差不大。

整體而言,RDNA 3 架構的 AMD Radeon RX 7900 XTX 表現讓我們覺得相當具有優勢,至於 Radeon RX 7900 XT 我們先保留到 GeForce RTX 4070 Ti 出來後再下結論。