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Radeon HD 5870 vs Radeon HD 6870

Intro

The Radeon HD 5870 comes with a GPU core speed of 850 MHz, and the 1024 MB of GDDR5 RAM runs at 1200 MHz through a 256-bit bus. It also is made up of 1600(320x5) SPUs, 80 Texture Address Units, and 32 Raster Operation Units.

Compare those specs to the Radeon HD 6870, which features core speeds of 900 MHz on the GPU, and 1050 MHz on the 1024 MB of GDDR5 RAM. It features 1120 SPUs along with 56 TAUs and 32 Rasterization Operator Units.

(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6870 151 Watts
Radeon HD 5870 188 Watts
Difference: 37 Watts (25%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 5870 should perform a small bit faster than the Radeon HD 6870 in general. (explain)

Radeon HD 5870 153600 MB/sec
Radeon HD 6870 134400 MB/sec
Difference: 19200 (14%)

Texel Rate

The Radeon HD 5870 will be a lot (more or less 35%) faster with regards to texture filtering than the Radeon HD 6870. (explain)

Radeon HD 5870 68000 Mtexels/sec
Radeon HD 6870 50400 Mtexels/sec
Difference: 17600 (35%)

Pixel Rate

The Radeon HD 6870 is a little bit (more or less 6%) better at FSAA than the Radeon HD 5870, and also should be capable of handling higher screen resolutions while still performing well. (explain)

Radeon HD 6870 28800 Mpixels/sec
Radeon HD 5870 27200 Mpixels/sec
Difference: 1600 (6%)

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 5870

Amazon.com

Radeon HD 6870

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 5870 Radeon HD 6870
Manufacturer AMD AMD
Year September 23, 2009 October 2010
Code Name Cypress XT Barts XT
Fab Process 40 nm 40 nm
Bus PCIe 2.1 x16 PCIe x16
Memory 1024 MB 1024 MB
Core Speed 850 MHz 900 MHz
Shader Speed N/A MHz (N/A) MHz
Memory Speed 1200 MHz (4800 MHz effective) 1050 MHz (4200 MHz effective)
Unified Shaders 1600(320x5) 1120
Texture Mapping Units 80 56
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
DirectX Version DirectX 11 DirectX 11
OpenGL Version OpenGL 3.2 OpenGL 4.1
Power (Max TDP) 188 watts 151 watts
Shader Model 5.0 5.0
Bandwidth 153600 MB/sec 134400 MB/sec
Texel Rate 68000 Mtexels/sec 50400 Mtexels/sec
Pixel Rate 27200 Mpixels/sec 28800 Mpixels/sec

Memory Bandwidth: Bandwidth is the max amount of information (counted in MB per second) that can be transferred across the external memory interface in a second. It is worked out by multiplying the bus width by its memory speed. In the case of DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This number is worked out by multiplying the total number of texture units by the core clock speed of the chip. The better this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly record to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour ROPs by the the card's clock speed. 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 quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.

Comments

5 Responses to “Radeon HD 5870 vs Radeon HD 6870”
[...] Here is a theoretical comparison, that has always seemed pretty close to real world performance. Radeon HD 5870 vs Radeon HD 6870 – Performance Comparison Benchmarks @ Hardware Compare If you can wait till this evening, we do have some real experts, and you won't be disappointed. [...]
[...] Posted by Lemon hahahaha that's a 5870 loser Idiot, see this: Radeon HD 5870 vs Radeon HD 6870 ***8211; Performance Comparison Benchmarks @ Hardware Compare 5870 is better than 6870, I think it may be better than all but the 6900 series [...]
[...] more efficient in terms of power consumption compared to a 5870 (unless I've overlooked something) Radeon HD 5870 vs Radeon HD 6870 – Performance Comparison Benchmarks @ Hardware Compare Definitely will be aiming for a used card, hopefully some fellow Canucks will sell their cards to [...]
larsV12 says:
Real world shows the 6870 will deliver better performance over its sibling at high res': http://www.techspot.com/review/325-amd-radeon-6870/page8.html

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