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Radeon HD 5770 vs Radeon HD 6950


The Radeon HD 5770 makes use of a 40 nm design. AMD has set the core frequency at 850 MHz. The GDDR5 memory works at a frequency of 1200 MHz on this specific model. It features 800(160x5) SPUs as well as 40 Texture Address Units and 16 ROPs.

Compare all that to the Radeon HD 6950, which comes with a core clock frequency of 800 MHz and a GDDR5 memory speed of 1250 MHz. It also makes use of a 256-bit memory bus, and uses a 40 nm design. It features 1408 SPUs, 88 TAUs, and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5770 108 Watts
Radeon HD 6950 200 Watts
Difference: 92 Watts (85%)

Memory Bandwidth

The Radeon HD 6950 should in theory perform much faster than the Radeon HD 5770 in general. (explain)

Radeon HD 6950 160000 MB/sec
Radeon HD 5770 76800 MB/sec
Difference: 83200 (108%)

Texel Rate

The Radeon HD 6950 should be a lot (approximately 107%) better at AF than the Radeon HD 5770. (explain)

Radeon HD 6950 70400 Mtexels/sec
Radeon HD 5770 34000 Mtexels/sec
Difference: 36400 (107%)

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 6950 is superior to the Radeon HD 5770, by far. (explain)

Radeon HD 6950 25600 Mpixels/sec
Radeon HD 5770 13600 Mpixels/sec
Difference: 12000 (88%)

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 5770

Radeon HD 6950

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.


Display Specifications

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Model Radeon HD 5770 Radeon HD 6950
Manufacturer AMD AMD
Year October 13, 2009 December 2010
Code Name Juniper XT Cayman Pro
Memory 1024 MB 1024 MB
Core Speed 850 MHz 800 MHz
Memory Speed 4800 MHz 5000 MHz
Power (Max TDP) 108 watts 200 watts
Bandwidth 76800 MB/sec 160000 MB/sec
Texel Rate 34000 Mtexels/sec 70400 Mtexels/sec
Pixel Rate 13600 Mpixels/sec 25600 Mpixels/sec
Unified Shaders 800(160x5) 1408
Texture Mapping Units 40 88
Render Output Units 16 32
Bus Type GDDR5 GDDR5
Bus Width 128-bit 256-bit
Fab Process 40 nm 40 nm
Transistors 1040 million 2640 million
Bus PCIe 2.1 x16 PCIe x16
DirectX Version DirectX 11 DirectX 11
OpenGL Version OpenGL 3.2 OpenGL 4.1

Memory Bandwidth: Bandwidth is the largest amount of information (measured in megabytes per second) that can be transported over the external memory interface within a second. The number is calculated by multiplying the card's interface width by its memory speed. In the case of DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster 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 amount of texture map elements (texels) that can be processed per second. This number is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.


One Response to “Radeon HD 5770 vs Radeon HD 6950”
[video card]Looking to Upgrade, thoughts? by SyNtHeTiC - TribalWar Forums says:

[...] a cool site you can use to compare cards My upgrade: Radeon HD 5770 vs Radeon HD 6950 ***8211; Performance Comparison Benchmarks @ Hardware Compare [...]

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