Select any two GPUs for comparison
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Gaming Performance Comparison

Recommended System Requirements
Game GeForce GTX 660 Gigabyte OC 3GB Edition Radeon HD 6870 PowerColor 1GB Edition
Halo: Reach 34% 8%
Cyberpunk 2077 186% 297%
Red Dead Redemption 2 108% 189%
Dragon Ball Z Kakarot 28% 78%
Call of Duty: Modern Warfare 108% 189%
Microsoft Flight Simulator 186% 297%
Doom Eternal 79% 149%
Grand Theft Auto VI 218% 342%
FIFA 20 11% 54%
Need For Speed Heat 108% 189%

In terms of overall gaming performance, the graphical capabilities of the Nvidia GeForce GTX 660 Gigabyte OC 3GB Edition are significantly better than the AMD Radeon HD 6870 PowerColor 1GB Edition.

The GTX 660 has a 133 MHz higher core clock speed and 24 more Texture Mapping Units than the HD 6870. This results in the GTX 660 providing 32.2 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 GTX 660 has a 133 MHz higher core clock speed than the HD 6870, but the HD 6870 has 8 more Render Output Units than the GTX 660. As a result, the HD 6870 exhibits a 4 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 6870, and so they are likely to have similar driver support for optimizing performance when running the latest games.

The GTX 660 has 2048 MB more video memory than the HD 6870, so is likely to be much better at displaying game textures at higher resolutions. This is supported by the fact that the GTX 660 also has superior memory performance overall.

The GTX 660 has 9.8 GB/sec greater memory bandwidth than the HD 6870, which means that the memory performance of the GTX 660 is marginally better than the HD 6870.

The GeForce GTX 660 Gigabyte OC 3GB Edition has 960 Shader Processing Units and the Radeon HD 6870 PowerColor 1GB Edition has 1120. However, the actual shader performance of the GTX 660 is 1054 and the actual shader performance of the HD 6870 is 504. The GTX 660 having 550 better shader performance and an altogether better performance when taking into account other relevant data means that the GTX 660 delivers a noticeably smoother and more efficient experience when processing graphical data than the HD 6870.

The GTX 660 transistor size technology is 12 nm (nanometers) smaller than the HD 6870. This means that the GTX 660 is expected to run slightly cooler and achieve higher clock frequencies than the HD 6870.

The GeForce GTX 660 Gigabyte OC 3GB Edition requires 140 Watts to run but there is no entry for the Radeon HD 6870 PowerColor 1GB Edition. We would recommend a PSU with at least 500 Watts for the GTX 660 and a PSU with at least 500 Watts for the HD 6870. The two GPUs have been recommended a PSU with the same amount of wattage. As such, there is no need to worry about which will more significantly affect your yearly electricity bills.

Game FPS Benchmarks On Ultra

GPU Architecture

Core Speed1033 MHzvs900 MHz
Boost Clock1098 MHzvs-
ArchitectureKepler GK106-400-A1Terascale 2 Barts XT
OC Potential Poor vs Fair
Driver Support Good vs Poor
Release Date01 Sep 2012vs01 Nov 2011
GPU LinkGD LinkGD Link
Approved
Comparison

Resolution Performance

1366x768 - green tick vs green tick -
1600x900
9.1
green tick vs
7.9
1920x1080
7.2
green tick vs
6
2560x1440
5.2
green tick vs
4.3
3840x2160
3.5
green tick vs -

GPU Memory

Memory3072 MBvs1024 MB
Memory Speed1502 MHzvs1050 MHz
Memory Bus192 Bitvs256 Bit
Memory TypeGDDR5vsGDDR5
Memory Bandwidth144.2GB/secvs134.4GB/sec
L2 Cache 384 KB vs green tick 512 KB
Delta Color Compression no vs no
Memory Performance 0% green tick vs green tick 0%
Comparison

GPU Display

Shader Processing Units960vs1120
Actual Shader Performance51%vs24%
Technology28nmvs40nm
Texture Mapping Units80vs56
Texture Rate82.6 GTexel/svs50.4 GTexel/s
Render Output Units24vs32
Pixel Rate24.8 GPixel/svs28.8 GPixel/s
Comparison

GPU Outputs

Max Digital Resolution (WxH)4096x2160vs2560x1600
VGA Connections0vs0
DVI Connections2vs2
HDMI Connections1vs1
DisplayPort Connections-vs-
Comparison

GPU Power Requirements

Max Power140 Watts-
Recommended PSU500 Watts & 32 Ampsvs500 Watts

GPU Features

DirectX12.0vs11.0
Shader Model5.0vs5.0
Open GL4.5vs4.3
Open CL-vs-
Notebook GPUnono
SLI/Crossfireyesvsyes
Dedicatedyesvsyes
Comparison

GPU Supporting Hardware

Recommended ProcessorIntel Core i5-3470 3.2GHzvsIntel Core i5-760 2.8GHz
Recommended RAM8 GBvs8 GB
Maximum Recommended Gaming Resolution1920x1080vs1920x1080

Gaming Performance Value

Performance Value

GPU Mini Review

Mini ReviewGeForce GTX 660 Gigabyte OC 3GB Edition a special edition of GeForce GTX 660.
The new features include the WINDFORCE 2X 100mm Fansink equipped with "Triangle Cool" Technology solution which is more effective than the standard/reference cooler.
In terms of overclocking, the base-clock was increased from 980MHz to 1033MHz and the boost clock can now reach 1098MHz, instead of 1033MHz. The memory clock was left untouched.
Furthermore, the frame buffer was increased to 3GB though this will not boost its performance and can be addressed as a gimmick - marketing to lure consumers into paying more for the same product.
The overclocking is therefore significant and the performance boost is around 6% when compared to the standard GeForce GTX 660.
Radeon HD 6870 PowerColor 1GB Edition is a special edition of the high-end Radeon HD 6870. See its page for more information about it.
It has no new features and so it can be addressed as a renamed Radeon HD 6870. Therefore its performance is exactly like the standard's.
Recommended CPU
Possible GPU Upgrades
GPU Variants
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