Select any two GPUs for comparison
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Gaming Performance Comparison

Recommended System Requirements
Game Radeon HD 7950 Crossfire GeForce GTX 660 Zotac AMP Edition
Halo: Reach 62% 35%
Cyberpunk 2077 63% 183%
Dragon Ball Z Kakarot 27% 27%
Red Dead Redemption 2 18% 106%
Call of Duty: Modern Warfare 18% 106%
Microsoft Flight Simulator 63% 183%
Doom Eternal 2% 77%
Grand Theft Auto VI 81% 215%
FIFA 20 37% 10%
Need For Speed Heat 18% 106%

In terms of overall gaming performance, the graphical capabilities of the AMD Radeon HD 7950 Crossfire are significantly better than the Nvidia GeForce GTX 660 Zotac AMP Edition.

The GTX 660 has a 246 MHz higher core clock speed than the HD 7950, but the HD 7950 has 144 more Texture Mapping Units than the GTX 660. As a result, the HD 7950 exhibits a 95.5 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 246 MHz higher core clock speed than the HD 7950, but the HD 7950 has 40 more Render Output Units than the GTX 660. As a result, the HD 7950 exhibits a 26.1 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 4096 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 321.4 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 Crossfire has 3584 Shader Processing Units and the GeForce GTX 660 Zotac AMP Edition has 960. However, the actual shader performance of the HD 7950 is 2437 and the actual shader performance of the GTX 660 is 1067. The HD 7950 having 1370 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 Crossfire requires 360 Watts to run but there is no entry for the GeForce GTX 660 Zotac AMP Edition. We would recommend a PSU with at least 750 Watts for the HD 7950.

Game FPS Benchmarks On Ultra

GPU Architecture

Core Speed800 MHzvs1046 MHz
Boost Clock-vs1111 MHz
ArchitectureGCN 1.0 Tahiti PRO (x2)Kepler GK106-400-A1
OC Potential Fair vs Poor
Driver Support Good vs Good
Release Date01 Jan 2012vs01 Sep 2012
GPU LinkGD LinkGD Link
Approved
Comparison

Resolution Performance

1366x768 - green tick vs green tick -
1600x900 - vs green tick
9.1
1920x1080
9.4
green tick vs
7.2
2560x1440 - vs green tick
5.2
3840x2160 - vs green tick
3.5

GPU Memory

Memory6144 MBvs2048 MB
Memory Speed1250 MHzvs1652 MHz
Memory Bus768 Bitvs192 Bit
Memory TypeGDDR5vsGDDR5
Memory Bandwidth480GB/secvs158.6GB/sec
L2 Cache 1536 KB green tick vs 384 KB
Delta Color Compression no vs no
Memory Performance 0% green tick vs green tick 0%
Comparison

GPU Display

Shader Processing Units3584vs960
Actual Shader Performance100%vs51%
Technology28nmvs28nm
Texture Mapping Units224vs80
Texture Rate179.2 GTexel/svs83.7 GTexel/s
Render Output Units64vs24
Pixel Rate51.2 GPixel/svs25.1 GPixel/s
Comparison

GPU Outputs

Max Digital Resolution (WxH)4096x2160vs4096x2160
VGA Connections0vs0
DVI Connections0vs2
HDMI Connections0vs1
DisplayPort Connections-vs-
Comparison

GPU Power Requirements

Max Power360 Watts-
Recommended PSU750 Watts & 30 Amps-

GPU Features

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

GPU Supporting Hardware

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

Gaming Performance Value

Performance Value

GPU Mini Review

Mini ReviewRadeon HD 7950 Crossfire is a solution of two 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 up to 42% better than a single Radeon HD 7950 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 360 Watt though the average power consumption should be slightly lower.
Even the most demanding games will run at the highest settings.
GeForce GTX 660 Zotac AMP Edition a special edition of GeForce GTX 660.
The new features include a new cooling system and in terms of overclocking, the base-clock was increased from 980MHz to 1046MHz and the boost clock can now reach 1111MHz, instead of 1033MHz. The memory clock was raised to 1652MHz.
Benchmarks indicate a 5.5% performance when compared to the reference card.
Recommended CPU
Possible GPU Upgrades
GPU Variants
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