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Gaming Performance Comparison

Recommended System Requirements
Game GeForce GTX 660 MSI OC 2GB Edition Radeon HD 6870 PowerColor 1GB Edition
Cyberpunk 2077 118% 203%
Assassins Creed: Valhalla 101% 179%
Call of Duty: Black Ops Cold War 124% 211%
Genshin Impact 120% 205%
eFootball PES 2021 11% 54%
Marvel's Avengers 108% 189%
Watch Dogs Legion 112% 195%
FIFA 21 11% 54%
Mafia: Definitive Edition 215% 338%
Microsoft Flight Simulator 94% 170%

In terms of overall gaming performance, the graphical capabilities of the Nvidia GeForce GTX 660 MSI OC 2GB Edition are significantly better than the AMD Radeon HD 6870 PowerColor 1GB Edition.

The GTX 660 has a 106 MHz higher core clock speed and 24 more Texture Mapping Units than the HD 6870. This results in the GTX 660 providing 30.1 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 106 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 4.7 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 1024 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 MSI OC 2GB 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 1029 and the actual shader performance of the HD 6870 is 504. The GTX 660 having 525 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.

We would recommend a PSU with at least 500 Watts for the HD 6870, but we do not have a recommended PSU wattage for the GTX 660.

Game FPS Benchmarks On Ultra

GPU Architecture

Core Speed1006 MHzvs900 MHz
Boost Clock1072 MHzvs-
ArchitectureKepler GK106-400-A1Terascale 2 Barts XT
OC Potential Fair vs Fair
Driver Support Good vs Poor
Release Date01 Oct 2012vs01 Nov 2011
GPU LinkGD LinkGD Link

Resolution Performance

1366x768 - green tick vs green tick -
green tick vs
green tick vs
green tick vs
green tick vs -

GPU Memory

Memory2048 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%

GPU Display

Shader Processing Units960vs1120
Actual Shader Performance50%vs24%
Texture Mapping Units80vs56
Texture Rate80.5 GTexel/svs50.4 GTexel/s
Render Output Units24vs32
Pixel Rate24.1 GPixel/svs28.8 GPixel/s

GPU Outputs

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

GPU Power Requirements

Max Power--
Recommended PSU-500 Watts

GPU Features

Shader Model5.0vs5.0
Open GL4.5vs4.3
Open CL-vs-
Notebook GPUnono

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

Crysis 3vs
Performance Value

GPU Mini Review

Mini ReviewGeForce GTX 660 MSI OC 2GB Edition is a special edition of GeForce GTX 660.
The new features include the Propeller Blade Technology solution which generates 20% more airflow than traditional fan design, according to MSI.
In terms of overclocking, the base-clock was increased from 980MHz to 1006MHz and the boost clock can now reach 1072MHz, instead of 1033MHz. The memory clock was left untouched.
The overclocking is therefore somewhat significant and the performance boost is around 5% 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