Select any two GPUs for comparison
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Gaming Performance Comparison

Recommended System Requirements
Game GeForce GTX 660 Gigabyte OC 2GB Edition SLI Radeon HD 7950 3-way Crossfire
Halo: Reach 62% 71%
Cyberpunk 2077 66% 24%
Red Dead Redemption 2 21% 10%
Dragon Ball Z Kakarot 25% 45%
Call of Duty: Modern Warfare 21% 10%
Doom Eternal 4% 23%
Microsoft Flight Simulator 66% 24%
Grand Theft Auto VI 85% 37%
FIFA 20 36% 52%
Need For Speed Heat 21% 10%

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 Gigabyte OC 2GB Edition SLI.

The GTX 660 has a 233 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 103.5 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 233 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 27.2 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 GeForce GTX 660 Gigabyte OC 2GB Edition SLI has 1920 Shader Processing Units and the Radeon HD 7950 3-way Crossfire has 5376. However, the actual shader performance of the GTX 660 is 2108 and the actual shader performance of the HD 7950 is 3656. The HD 7950 having 1548 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 GeForce GTX 660 Gigabyte OC 2GB Edition SLI requires 260 Watts to run and the Radeon HD 7950 3-way Crossfire requires 540 Watts. We would recommend a PSU with at least 600 Watts for the GTX 660. The HD 7950 requires 280 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 Speed1033 MHzvs800 MHz
Boost Clock1098 MHzvs-
ArchitectureKepler GK106-400-A1 (x2)GCN 1.0 Tahiti PRO (x3)
OC Potential Poor vs Fair
Driver Support Good vs Good
Release Date01 Sep 2012vs01 Jan 2012
GPU LinkGD LinkGD Link
Approved
Comparison

Resolution Performance

1366x768 - green tick vs green tick -
1600x900 - green tick vs green tick -
1920x1080
9.3
vs green tick
10
2560x1440 - green tick vs green tick -
3840x2160 - green tick vs green tick -

GPU Memory

Memory4096 MBvs9216 MB
Memory Speed1502 MHzvs1250 MHz
Memory Bus384 Bitvs1152 Bit
Memory TypeGDDR5vsGDDR5
Memory Bandwidth288.4GB/secvs720GB/sec
L2 Cache 768 KB vs green tick 2304 KB
Delta Color Compression no vs no
Memory Performance 0% green tick vs green tick 0%
Comparison

GPU Display

Shader Processing Units1920vs5376
Actual Shader Performance100%vs100%
Technology28nmvs28nm
Texture Mapping Units160vs336
Texture Rate165.3 GTexel/svs268.8 GTexel/s
Render Output Units48vs96
Pixel Rate49.6 GPixel/svs76.8 GPixel/s
Comparison

GPU Outputs

Max Digital Resolution (WxH)4096x2160vs4096x2160
VGA Connections0vs0
DVI Connections2vs3
HDMI Connections1vs3
DisplayPort Connections-vs-
Comparison

GPU Power Requirements

Max Power260 Wattsvs540 Watts
Recommended PSU600 Watts & 42 Amps-

GPU Features

DirectX12.0vs12.0
Shader Model5.0vs5.0
Open GL4.5vs4.4
Open CL-vs-
Notebook GPUnono
SLI/Crossfirenovsno
Dedicatedyesvsyes
Comparison

GPU Supporting Hardware

Recommended ProcessorIntel Core i5-3470 3.2GHzvsIntel Core i5-3570K 3.4GHz
Recommended RAM8 GBvs8 GB
Maximum Recommended Gaming Resolution1920x1080vs1920x1080

Gaming Performance Value

Performance Value

GPU Mini Review

Mini ReviewThe SLI setup of GeForce GTX 660 Gigabyte OC 2GB Edition.Radeon 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.
Recommended CPU
Possible GPU Upgrades
-
GPU Variants
-
-

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