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Gaming Performance Comparison
In terms of overall gaming performance, the graphical capabilities of the AMD Radeon HD 7990 are very slightly better than the AMD Radeon HD 7970 Crossfire.
The Radeon HD 7990 has a 25 MHz higher core clock speed and the same number of Texture Mapping Units as the HD 7970. This results in the Radeon HD 7990 providing 6.4 GTexel/s better texturing performance. This still holds weight but shader performance is generally more relevant, particularly since both of these GPUs support at least DirectX 10.
The Radeon HD 7990 has a 25 MHz higher core clock speed than the HD 7970 and the same number of Render Output Units. This results in the Radeon HD 7990 providing 1.6 GPixel/s better pixeling performance. However, both GPUs support DirectX 9 or above, and pixeling performance is only really relevant when comparing older cards.
The Radeon HD 7990 was released less than a year after the HD 7970, and so they are likely to have similar driver support for optimizing performance when running the latest games.
Both GPUs exhibit very powerful performance, so it probably isn't worth upgrading from one to the other, as both are capable of running even the most demanding games at the highest settings.
The Radeon HD 7970 Crossfire and the Radeon HD 7990 have the same amount of video memory, but are likely to provide slightly different experiences when displaying game textures at high resolutions.
The Radeon HD 7990 has 48 GB/sec greater memory bandwidth than the HD 7970, which means that the memory performance of the Radeon HD 7990 is noticeably better than the HD 7970.
Both the Radeon HD 7970 Crossfire and the Radeon HD 7990 have 4096 Shader Processing Units. While the two GPUs have the same number of SPUs, the actual performance delivered by the . Knowing that the shader performance of the Radeon HD 7990 is superior, it is not necessary to examine the GPUs' respective Texture and Pixel Fill Rates.
The Radeon HD 7970 Crossfire requires 460 Watts to run and the Radeon HD 7990 requires 375 Watts. We would recommend a PSU with at least 750 Watts for the Radeon HD 7990, but we do not have a recommended PSU wattage for the HD 7970. The HD 7970 requires 85 Watts more than the Radeon HD 7990 to run. The difference is significant enough that the HD 7970 may have an adverse affect on your yearly electricity bills in comparison to the Radeon HD 7990.
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|Max Power||460 Watts||vs||375 Watts|
|Recommended RAM||8 GB||vs||12 GB|
|Recommended Screen Size||1920x1080||2560x1600|
|Recommended PSU||-||750 Watts & 46 Amps|
|Mini Review||Radeon HD 7970 Crossfire is a solution of two Radeon HD 7970 put together using AMD'S Crossfire technology. |
Check the page of Radeon HD 7970 to know more about its chip.
Crossfire relies a lot on proper driver support and may suffer from micro-stuttering in lower frame rates (below 30). Benchmarks indicate the performance is overall, is up to 64% better than a single Radeon HD 7970 performing by itself but at times (depending whether or not the 3D game supports crossfire or in the graphics driver) it performed worse than a single Radeon HD 7970. Expect this combination to draw up to 600 Watt though the average power consumption should be slightly lower.
Even the most demanding games will run at the highest settings.
|Radeon HD 7990 is a dual-graphics solution based on the 28nm, GCN architecture. |
It's based on a Core codenamed "Malta" and offers 4096 Shader Processing Units (2048 per GPU), 256 TMUs (128 per GPU) and 64 ROPs (32 per GPU), on a 768-bit (368-bit per GPU) memory interface of fast GDDR5. The central unit runs at 950MHz (1000 in Turbo Mode) and the memory clock operates at 1500MHz.
It consumes up to 375W.
With the latest driver optimizations, benchmarks put this card as the fastest standard dual-graphics solution available.