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Radeon HD 6870 vs Radeon HD 7850

Intro

The Radeon HD 6870 makes use of a 40 nm design. AMD has set the core speed at 900 MHz. The GDDR5 RAM is set to run at a frequency of 1050 MHz on this card. It features 1120 SPUs as well as 56 Texture Address Units and 32 Rasterization Operator Units.

Compare those specifications to the Radeon HD 7850, which has a clock frequency of 860 MHz and a GDDR5 memory frequency of 1200 MHz. It also features a 256-bit memory bus, and makes use of a 28 nm design. It is made up of 1024 SPUs, 64 TAUs, and 32 Raster Operation Units.

(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7850 130 Watts
Radeon HD 6870 151 Watts
Difference: 21 Watts (16%)

Memory Bandwidth

The Radeon HD 7850, in theory, should be just a bit faster than the Radeon HD 6870 in general. (explain)

Radeon HD 7850 153600 MB/sec
Radeon HD 6870 134400 MB/sec
Difference: 19200 (14%)

Texel Rate

The Radeon HD 7850 will be a bit (approximately 9%) more effective at AF than the Radeon HD 6870. (explain)

Radeon HD 7850 55040 Mtexels/sec
Radeon HD 6870 50400 Mtexels/sec
Difference: 4640 (9%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 6870 is the winner, but only just. (explain)

Radeon HD 6870 28800 Mpixels/sec
Radeon HD 7850 27520 Mpixels/sec
Difference: 1280 (5%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

Price Comparison

Radeon HD 6870

Amazon.com

Radeon HD 7850

Amazon.com

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

Model Radeon HD 6870 Radeon HD 7850
Manufacturer AMD AMD
Year October 2010 March 2012
Code Name Barts XT Pitcairn Pro
Fab Process 40 nm 28 nm
Bus PCIe x16 PCIe 3.0 x16
Memory 1024 MB 2048 MB
Core Speed 900 MHz 860 MHz
Shader Speed N/A MHz (N/A) MHz
Memory Speed 1050 MHz (4200 MHz effective) 1200 MHz (4800 MHz effective)
Unified Shaders 1120 1024
Texture Mapping Units 56 64
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
DirectX Version DirectX 11 DirectX 11.1
OpenGL Version OpenGL 4.1 OpenGL 4.2
Power (Max TDP) 151 watts 130 watts
Shader Model 5.0 5.0
Bandwidth 134400 MB/sec 153600 MB/sec
Texel Rate 50400 Mtexels/sec 55040 Mtexels/sec
Pixel Rate 28800 Mpixels/sec 27520 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the largest amount of data (measured in MB per second) that can be moved over the external memory interface in a second. The number is worked out by multiplying the card's interface width by its memory clock speed. If the card has DDR type RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The better the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.

Comments

2 Responses to “Radeon HD 6870 vs Radeon HD 7850”
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[...] budget is around 400. If not, i don't take the 7000series card and take the 6000series. Radeon HD 6870 vs Radeon HD 7850 – Performance Comparison Benchmarks @ Hardware Compare in that website, the different around less than 15%. but the price is differ 100+ So what do [...]

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