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Radeon HD 6850 vs Radeon HD 7750

Intro

The Radeon HD 6850 comes with a GPU core speed of 775 MHz, and the 1024 MB of GDDR5 RAM is set to run at 1000 MHz through a 256-bit bus. It also is made up of 960 Stream Processors, 48 TAUs, and 32 Raster Operation Units.

Compare those specifications to the Radeon HD 7750, which has a core clock speed of 800 MHz and a GDDR5 memory frequency of 1125 MHz. It also features a 128-bit memory bus, and uses a 28 nm design. It is made up of 512 SPUs, 32 TAUs, and 16 Raster Operation Units.

(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

Theoretically speaking, the Radeon HD 6850 is 78% faster than the Radeon HD 7750 overall, due to its higher bandwidth. (explain)

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

Texel Rate

The Radeon HD 6850 should be quite a bit (more or less 45%) faster with regards to texture filtering than the Radeon HD 7750. (explain)

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

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 6850 is superior to the Radeon HD 7750, by a large margin. (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

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

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 1000 MHz (4000 MHz effective) 1125 MHz (4500 MHz effective)
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: Bandwidth is the max amount of information (measured in megabytes per second) that can be transferred past the external memory interface in a second. The number is calculated by multiplying the interface width by its memory speed. If the card has DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.

Comments

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