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Gaming Performance Comparison

In terms of overall gaming performance, the graphical capabilities of the AMD Radeon HD 7950 Vapor-X OC Edition are marginally better than the AMD Radeon HD 6950 Crossfire.

The HD 7950 has a 100 MHz higher core clock speed than the HD 6950, but the HD 6950 has 64 more Texture Mapping Units than the HD 7950. As a result, the HD 6950 exhibits a 40 GTexel/s better Texture Fill Rate than the HD 7950. This still holds weight but shader performance is generally more relevant, particularly since both of these GPUs support at least DirectX 10.

The HD 7950 has a 100 MHz higher core clock speed than the HD 6950, but the HD 6950 has 32 more Render Output Units than the HD 7950. As a result, the HD 6950 exhibits a 22.4 GPixel/s better Pixel Fill Rate than the HD 7950. However, both GPUs support DirectX 9 or above, and pixeling performance is only really relevant when comparing older cards.

The HD 7950 was released less than a year after the HD 6950, 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 HD 6950 has 1024 MB more video memory than the HD 7950, so is likely to be much better at displaying game textures at higher resolutions. This is supported by the fact that the HD 6950 also has superior memory performance overall.

The HD 6950 has 80 GB/sec greater memory bandwidth than the HD 7950, which means that the memory performance of the HD 6950 is much better than the HD 7950.

The Radeon HD 6950 Crossfire has 2016 Shader Processing Units and the Radeon HD 7950 Vapor-X OC Edition has 1792. However, the actual shader performance of the HD 6950 is 1048 and the actual shader performance of the HD 7950 is 1452. The HD 7950 having 404 better shader performance is not particularly notable, as altogether the HD 6950 performs better when taking into account other relevant data.

The HD 7950 transistor size technology is 12 nm (nanometers) smaller than the HD 6950. This means that the HD 7950 is expected to run slightly cooler and achieve higher clock frequencies than the HD 6950. As they exhibit similar graphical performance, the HD 7950 should consume less power than the HD 6950.

The Radeon HD 6950 Crossfire requires 400 Watts to run but there is no entry for the Radeon HD 7950 Vapor-X OC Edition. We would recommend a PSU with at least 500 Watts for the HD 7950, but we do not have a recommended PSU wattage for the HD 6950.

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GPU Core Details

Core Speed800 MHzvs900 MHz
ArchitectureCayman Pro GCN 1.0 Tahiti PRO
Notebook GPUnono
Release Date01 Oct 201001 Aug 2012
GPU LinkGD LinkGD Link

GPU Memory

Memory4096 MBvs3072 MB
Memory Speed1250 MHzvs1250 MHz
Memory Bus512 Bitvs384 Bit
Memory TypeGDDR5vsGDDR5
Memory Bandwidth320GB/secvs240GB/sec
L2 Cache - vs green tick 768 KB

GPU Display

Shader Processing Units2016vs1792
Actual Shader Performance1048vs1452
Texture Mapping Units176vs112
Texture Rate140.8 GTexel/svs100.8 GTexel/s
Render Output Units64vs32
Pixel Rate51.2 GPixel/svs28.8 GPixel/s

GPU Display Tech

Shader Model5.0vs5.0
Open GL4.2vs4.2
Max Resolution (WxH)2560x1600vs4096x2160
VGA Connections0vs0
DVI Connections0vs2
HDMI Connections0vs1

GPU Power Requirements

Max Power400 Watts-

GPU Supporting Hardware

Recommended RAM8 GBvs8 GB
Recommended Screen Size1920x10801920x1080
Recommended PSU-500 Watts

Gaming Performance Value

Performance Value

GPU Mini Review

Mini ReviewRadeon HD 6950 Crossfire is a solution of two Radeon HD 6950 put together using AMD'S Crossfire technology.
Check the page of Radeon HD 6950 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 x% better than a single Radeon HD 6950 performing by itself it might be worse (depending on whether or not the 3D game supports crossfire or in the graphics driver) than a single Radeon HD 6950. Expect this combination to draw up to 400 Watt though the average power consumption should be slightly lower.
Even the most demanding games will run at the highest settings.
Radeon HD 7950 Vapor-X OC Edition is a special edition of the Radeon HD 7950. See the standard's version page to know more about it.
The new features include a core-clock raise from 800MHz to 850MHz (900MHz in Turbo Boost) which can be of 950MHz in "lethal mode" (via BIOS). A new cooling system called Vapor-X was installed which should keep Radeon HD 7950's temperatures low under extreme loading.
The performance boost is around 4% and 7% when compared to standard Radeon HD 7950 in normal and lethal modes, respectively.
Recommended CPUAMD Phenom II X4 840T
Intel Core i3-3245 3.4GHz
AMD APU A8-5600K Quad-Core
Intel Core i3-3220 3.3GHz
Intel Core i3-3225 3.3GHz
Intel Core i7-4785T 4-Core 2.2GHz
Intel Xeon E5-2407 v2
Intel Core i5-4570 3.2GHz
Intel Core i5-4670S 3.1GHz
Intel Core i5-3570 3.4GHz
Possible GPU UpgradesRadeon R9 280X Sapphire Toxic 3GB OC Edition
GeForce GTX 770
Radeon R9 280X XFX Double D Black Edition
Radeon R9 280X Matrix Platinum 3GB Edition
Radeon R9 280X DirectCU II TOP 3GB Edition
GeForce GTX 770 Gainward Phantom 4GB Edition
GeForce GTX 770 Inno3D iChill HerculeZ X3 Ultra 4GB Edition
GeForce GTX 770 DirectCU II 2GB OC Edition
Radeon R9 280X Sapphire Toxic 3GB OC Edition
GeForce GTX 770
GPU Variants--