Select any two GPUs for comparison

Gaming Performance Comparison

Recommended System Requirements
Game Radeon HD 7950 3-way Crossfire GeForce GTX 660 SLI
Halo: Reach 71% 60%
Cyberpunk 2077 24% 75%
Red Dead Redemption 2 10% 27%
Dragon Ball Z Kakarot 45% 22%
Call of Duty: Modern Warfare 10% 27%
Doom Eternal 23% 9%
Microsoft Flight Simulator 24% 75%
Grand Theft Auto VI 37% 94%
FIFA 20 52% 32%
Need For Speed Heat 10% 27%

In terms of overall gaming performance, the graphical capabilities of the AMD Radeon HD 7950 3-way Crossfire are significantly better than the Nvidia GeForce GTX 660 SLI.

The GTX 660 has a 180 MHz higher core clock speed than the HD 7950, but the HD 7950 has 176 more Texture Mapping Units than the GTX 660. As a result, the HD 7950 exhibits a 112 GTexel/s better Texture Fill Rate than the GTX 660. This still holds weight but shader performance is generally more relevant, particularly since both of these GPUs support at least DirectX 10.

The GTX 660 has a 180 MHz higher core clock speed than the HD 7950, but the HD 7950 has 48 more Render Output Units than the GTX 660. As a result, the HD 7950 exhibits a 29.8 GPixel/s better Pixel Fill Rate than the GTX 660. However, both GPUs support DirectX 9 or above, and pixeling performance is only really relevant when comparing older cards.

The GTX 660 was released less than a year after the HD 7950, 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 7950 has 5120 MB more video memory than the GTX 660, so is likely to be much better at displaying game textures at higher resolutions. This is supported by the fact that the HD 7950 also has superior memory performance overall.

The HD 7950 has 431.6 GB/sec greater memory bandwidth than the GTX 660, which means that the memory performance of the HD 7950 is massively better than the GTX 660.

The Radeon HD 7950 3-way Crossfire has 5376 Shader Processing Units and the GeForce GTX 660 SLI has 1920. However, the actual shader performance of the HD 7950 is 3656 and the actual shader performance of the GTX 660 is 1983. The HD 7950 having 1673 better shader performance and an altogether better performance when taking into account other relevant data means that the HD 7950 delivers a massively smoother and more efficient experience when processing graphical data than the GTX 660.

The Radeon HD 7950 3-way Crossfire requires 540 Watts to run and the GeForce GTX 660 SLI requires 280 Watts. We would recommend a PSU with at least 600 Watts for the GTX 660, but we do not have a recommended PSU wattage for the HD 7950. The HD 7950 requires 260 Watts more than the GTX 660 to run. The difference is significant enough that the HD 7950 may have an adverse affect on your yearly electricity bills in comparison to the GTX 660.

Game FPS Benchmarks On Ultra

GPU Architecture

Core Speed800 MHzvs980 MHz
Boost Clock-vs1033 MHz
ArchitectureGCN 1.0 Tahiti PRO (x3)Kepler GK106-400-A1 (x2)
OC Potential Fair vs Poor
Driver Support Good vs Good
Release Date01 Jan 2012vs01 Sep 2012
GPU LinkGD LinkGD Link

Resolution Performance

1366x768 - green tick vs green tick -
1600x900 - green tick vs green tick -
green tick vs
2560x1440 - green tick vs green tick -
3840x2160 - green tick vs green tick -

GPU Memory

Memory9216 MBvs4096 MB
Memory Speed1250 MHzvs1502 MHz
Memory Bus1152 Bitvs384 Bit
Memory TypeGDDR5vsGDDR5
Memory Bandwidth720GB/secvs288.4GB/sec
L2 Cache 2304 KB green tick vs 768 KB
Delta Color Compression no vs no
Memory Performance 0% green tick vs green tick 0%

GPU Display

Shader Processing Units5376vs1920
Actual Shader Performance100%vs95%
Texture Mapping Units336vs160
Texture Rate268.8 GTexel/svs156.8 GTexel/s
Render Output Units96vs48
Pixel Rate76.8 GPixel/svs47 GPixel/s

GPU Outputs

Max Digital Resolution (WxH)4096x2160vs4096x2160
VGA Connections0vs0
DVI Connections3vs4
HDMI Connections3vs2
DisplayPort Connections-vs-

GPU Power Requirements

Max Power540 Wattsvs280 Watts
Recommended PSU-600 Watts

GPU Features

Shader Model5.0vs5.0
Open GL4.4vs4.5
Open CL-vs-
Notebook GPUnono

GPU Supporting Hardware

Recommended ProcessorIntel Core i5-3570K 3.4GHzvsIntel Core i7-3770K 4-Core 3.5GHz
Recommended RAM8 GBvs8 GB
Maximum Recommended Gaming Resolution1920x1080vs1920x1080

Gaming Performance Value

Performance Value

GPU Mini Review

Mini ReviewRadeon HD 7950 3-way Crossfire is a solution of three Radeon HD 7950 put together using AMD'S Crossfire technology.
Check the page of Radeon HD 7950 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 somewhat superior to a single Radeon HD 7990 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 7950. Expect this combination to draw up to 540 Watt though the average power consumption should be slightly lower.
Even the most demanding games will run at the highest settings.
GeForce GTX 660 SLI is a solution of two GeForce GTX 660 put together using NVIDIA'S SLI technology.
SLI relies a lot on proper driver support and may cause micro stuttering in FPS below 30. This means this combination might even perform worse than a single GTX 660.
The optimal performance it delivers is largely better than a single GeForce GTX 680.
Therefore, this combination is sufficient for gaming at 1080p and most demanding games can be played at the highest settings.
Recommended CPU
Possible GPU Upgrades
GPU Variants