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Gaming Performance Comparison

Recommended System Requirements
Game Radeon HD 6870 PowerColor 1GB Edition Radeon HD 7870
Red Dead Redemption 2 189% 106%
Doom Eternal 149% 77%
Cyberpunk 2077 297% 183%
Call of Duty: Modern Warfare 189% 106%
Dragon Ball Z Kakarot 78% 27%
Microsoft Flight Simulator 297% 183%
Star Wars: Jedi - Fallen Order 297% 183%
Grand Theft Auto VI 342% 214%
Need For Speed Heat 189% 106%
Warcraft 3: Reforged 89% 92%

In terms of overall gaming performance, the graphical capabilities of the AMD Radeon HD 7870 are significantly better than the AMD Radeon HD 6870 PowerColor 1GB Edition.

The Radeon HD 7870 has a 100 MHz higher core clock speed and 24 more Texture Mapping Units than the HD 6870. This results in the Radeon HD 7870 providing 29.6 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 Radeon HD 7870 has a 100 MHz higher core clock speed than the HD 6870 and the same number of Render Output Units. This results in the Radeon HD 7870 providing 3.2 GPixel/s better pixeling performance. However, both GPUs support DirectX 9 or above, and pixeling performance is only really relevant when comparing older cards.

The Radeon HD 7870 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 Radeon HD 7870 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 Radeon HD 7870 also has superior memory performance overall.

The Radeon HD 7870 has 19.2 GB/sec greater memory bandwidth than the HD 6870, which means that the memory performance of the Radeon HD 7870 is slightly better than the HD 6870.

The Radeon HD 6870 PowerColor 1GB Edition has 1120 Shader Processing Units and the Radeon HD 7870 has 1280. However, the actual shader performance of the HD 6870 is 504 and the actual shader performance of the Radeon HD 7870 is 1088. The Radeon HD 7870 having 584 better shader performance and an altogether better performance when taking into account other relevant data means that the Radeon HD 7870 delivers a significantly smoother and more efficient experience when processing graphical data than the HD 6870.

The Radeon HD 7870 transistor size technology is 12 nm (nanometers) smaller than the HD 6870. This means that the Radeon HD 7870 is expected to run slightly cooler and achieve higher clock frequencies than the HD 6870.

The Radeon HD 7870 requires 175 Watts to run but there is no entry for the HD 6870. We would recommend a PSU with at least 500 Watts for the HD 6870 and a PSU with at least 500 Watts for the Radeon HD 7870. 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 Speed900 MHzvs1000 MHz
Boost Clock-vs-
ArchitectureTerascale 2 Barts XTGCN 1.0 Pitcairn XT
OC Potential Fair vs Fair
Driver Support Poor vs Good
Release Date01 Nov 2011vs05 Mar 2012
GPU LinkGD LinkGD Link

Resolution Performance

1366x768 - vs green tick
vs green tick
vs green tick
vs green tick
3840x2160 - vs green tick

GPU Memory

Memory1024 MBvs2048 MB
Memory Speed1050 MHzvs1200 MHz
Memory Bus256 Bitvs256 Bit
Memory TypeGDDR5vsGDDR5
Memory Bandwidth134.4GB/secvs153.6GB/sec
L2 Cache 512 KB green tick vs green tick 512 KB
Delta Color Compression no vs no
Memory Performance 0% green tick vs green tick 0%

GPU Display

Shader Processing Units1120vs1280
Actual Shader Performance24%vs52%
Texture Mapping Units56vs80
Texture Rate50.4 GTexel/svs80 GTexel/s
Render Output Units32vs32
Pixel Rate28.8 GPixel/svs32 GPixel/s

GPU Outputs

Max Digital Resolution (WxH)2560x1600vs4096x2160
VGA Connections0vs0
DVI Connections2vs1
HDMI Connections1vs1
DisplayPort Connections-vs-

GPU Power Requirements

Max Power-175 Watts
Recommended PSU500 Wattsvs500 Watts & 33 Amps

GPU Features

Shader Model5.0vs5.0
Open GL4.3vs4.4
Open CL-vs-
Notebook GPUnono

GPU Supporting Hardware

Recommended ProcessorIntel Core i5-760 2.8GHzvsIntel Core i5-3570K 3.4GHz
Recommended RAM8 GBvs8 GB
Maximum Recommended Gaming Resolution1920x1080vs1920x1080

Gaming Performance Value

Performance Value

GPU Mini Review

Mini ReviewRadeon 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.
Radeon HD 7870 is a Performance Graphics Card based on the First Revision of the Graphics Core Next (GCN) Architecture.

The GCN Architecture succeeds the 40nm Terascale Architecture. In addition to being produced with a 28nm Technology, the GCN Architecture adds other Technologies that allow for energy efficiency. For example, ZeroCore Power, a long idle power saving technology, allows the Graphics Cards to shut down by itself when the Monitor is turned off.
GCN also adds Improved Anisotropic Filtering, DirectX 11 Tessellation and the Partially Resident Textures (PRT) Technology, which enables future games to utilize ultra-high resolution textures with the same performance as today's small and often repetitive textures.

It equips a GPU Codenamed Pitcairn XT which has 20 Compute Units activated and thus offers 1280 Shader Processing Units, 80 TMUs and 32 ROPs. The Central Unit is clocked at 1000MHz.

The GPU accesses a 2GB frame buffer of fast GDDR5, through a 256-bit memory interface. The size of the frame buffer is adequate. The Memory Clock Operates at 1200MHz.

Power Consumption
With a rated board TDP of 175W, it requires at least a 500W PSU with two available 6-pin connectors.

Radeon HD 7870 competes with GeForce GTX 660 Ti but its performance was only slightly above the lower positioned GeForce GTX 660 and so GeForce GTX 660 Ti was considerably faster.

System Suggestions
Radeon HD 7870 is best suited for resolutions up to and including 1920x1080. We recommend a Strong Processor (Intel Core i5 Quad Core/AMD FX Six Core) and 8GB of RAM for Optimal Performance.
Recommended CPU
Possible GPU Upgrades
GPU Variants