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Radeon HD 6950 vs Radeon HD 7750

Intro

The Radeon HD 6950 uses a 40 nm design. AMD has clocked the core frequency at 800 MHz. The GDDR5 memory runs at a frequency of 1250 MHz on this card. It features 1408 SPUs as well as 88 TAUs and 32 ROPs.

Compare those specs to the Radeon HD 7750, which uses a 28 nm design. AMD has clocked the core speed at 800 MHz. The GDDR5 RAM runs at a speed of 1125 MHz on this particular card. It features 512 SPUs as well as 32 TAUs and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7750 55 Watts
Radeon HD 6950 200 Watts
Difference: 145 Watts (264%)

Memory Bandwidth

Theoretically, the Radeon HD 6950 should perform much faster than the Radeon HD 7750 in general. (explain)

Radeon HD 6950 160000 MB/sec
Radeon HD 7750 72000 MB/sec
Difference: 88000 (122%)

Texel Rate

The Radeon HD 6950 will be quite a bit (more or less 175%) faster with regards to anisotropic filtering than the Radeon HD 7750. (explain)

Radeon HD 6950 70400 Mtexels/sec
Radeon HD 7750 25600 Mtexels/sec
Difference: 44800 (175%)

Pixel Rate

The Radeon HD 6950 should be a lot (approximately 100%) better at anti-aliasing than the Radeon HD 7750, and also capable of handling higher resolutions without losing too much performance. (explain)

Radeon HD 6950 25600 Mpixels/sec
Radeon HD 7750 12800 Mpixels/sec
Difference: 12800 (100%)

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 6950

Radeon HD 7750

Specifications

Display Specifications

Hide Specifications

Model Radeon HD 6950 Radeon HD 7750
Manufacturer AMD AMD
Year December 2010 February 2012
Code Name Cayman Pro Cape Verde Pro
Memory 1024 MB 1024 MB
Core Speed 800 MHz 800 MHz
Memory Speed 5000 MHz 4500 MHz
Power (Max TDP) 200 watts 55 watts
Bandwidth 160000 MB/sec 72000 MB/sec
Texel Rate 70400 Mtexels/sec 25600 Mtexels/sec
Pixel Rate 25600 Mpixels/sec 12800 Mpixels/sec
Unified Shaders 1408 512
Texture Mapping Units 88 32
Render Output Units 32 16
Bus Type GDDR5 GDDR5
Bus Width 256-bit 128-bit
Fab Process 40 nm 28 nm
Transistors 2640 million 1500 million
Bus PCIe x16 PCIe 3.0 x16
DirectX Version DirectX 11 DirectX 11.1
OpenGL Version OpenGL 4.1 OpenGL 4.2

Memory Bandwidth: Bandwidth is the maximum amount of information (counted in megabytes per second) that can be moved across the external memory interface within a second. It is calculated by multiplying the bus width by its memory clock speed. In the case of DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied per second. This is worked out by multiplying the total number of texture units by the core clock speed of the chip. The higher 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 a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.

Radeon HD 6950

Radeon HD 7750

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