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Radeon HD 6850 vs Radeon HD 7750

Intro

The Radeon HD 6850 features core clock speeds of 775 MHz on the GPU, and 1000 MHz on the 1024 MB of GDDR5 RAM. It features 960 SPUs along with 48 TAUs and 32 ROPs.

Compare all that to the Radeon HD 7750, which features a GPU core clock speed of 800 MHz, and 1024 MB of GDDR5 RAM set to run at 1125 MHz through a 128-bit bus. It also is comprised of 512 Stream Processors, 32 TAUs, and 16 Raster Operation Units.

Display Graphs

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(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7750 55 Watts
Radeon HD 6850 127 Watts
Difference: 72 Watts (131%)

Memory Bandwidth

The Radeon HD 6850 should in theory perform much faster than the Radeon HD 7750 in general. (explain)

Radeon HD 6850 128000 MB/sec
Radeon HD 7750 72000 MB/sec
Difference: 56000 (78%)

Texel Rate

The Radeon HD 6850 is quite a bit (more or less 45%) faster with regards to AF than the Radeon HD 7750. (explain)

Radeon HD 6850 37200 Mtexels/sec
Radeon HD 7750 25600 Mtexels/sec
Difference: 11600 (45%)

Pixel Rate

The Radeon HD 6850 is quite a bit (about 94%) more effective at AA than the Radeon HD 7750, and capable of handling higher resolutions better. (explain)

Radeon HD 6850 24800 Mpixels/sec
Radeon HD 7750 12800 Mpixels/sec
Difference: 12000 (94%)

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

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Radeon HD 6850

Amazon.com

Radeon HD 7750

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

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Model Radeon HD 6850 Radeon HD 7750
Manufacturer AMD AMD
Year October 2010 February 2012
Code Name Barts Pro Cape Verde Pro
Fab Process 40 nm 28 nm
Bus PCIe x16 PCIe 3.0 x16
Memory 1024 MB 1024 MB
Core Speed 775 MHz 800 MHz
Shader Speed N/A MHz (N/A) MHz
Memory Speed 4000 MHz 4500 MHz
Unified Shaders 960 512
Texture Mapping Units 48 32
Render Output Units 32 16
Bus Type GDDR5 GDDR5
Bus Width 256-bit 128-bit
DirectX Version DirectX 11 DirectX 11.1
OpenGL Version OpenGL 4.1 OpenGL 4.2
Power (Max TDP) 127 watts 55 watts
Shader Model 5.0 5.0
Bandwidth 128000 MB/sec 72000 MB/sec
Texel Rate 37200 Mtexels/sec 25600 Mtexels/sec
Pixel Rate 24800 Mpixels/sec 12800 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the maximum amount of information (measured in megabytes per second) that can be transported across the external memory interface within a second. It is worked out by multiplying the interface width by its memory clock speed. If the card has DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied in one second. This is worked out by multiplying the total texture units by the core speed of the chip. The better the texel rate, 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 maximum amount of pixels that the graphics chip could possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.

Comments

3 Responses to “Radeon HD 6850 vs Radeon HD 7750”
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