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Radeon HD 5770 vs Radeon HD 6950

Intro

The Radeon HD 5770 has a core clock frequency of 850 MHz and a GDDR5 memory speed of 1200 MHz. It also makes use of a 128-bit bus, and uses a 40 nm design. It is made up of 800(160x5) SPUs, 40 TAUs, and 16 Raster Operation Units.

Compare that to the Radeon HD 6950, which features a GPU core clock speed of 800 MHz, and 1024 MB of GDDR5 memory running at 1250 MHz through a 256-bit bus. It also is made up of 1408 SPUs, 88 Texture Address Units, and 32 ROPs.

Display Graphs

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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

Theoretically speaking, the Radeon HD 6950 is 108% faster than the Radeon HD 5770 overall, due to its greater data rate. (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 (about 107%) faster with regards to texture filtering than the Radeon HD 5770. (explain)

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

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 6950 is a better choice, 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

Amazon.com

Radeon HD 6950

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 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: Memory bandwidth is the max amount of information (counted in MB per second) that can be moved across the external memory interface in a second. It is worked out by multiplying the bus width by the speed of its memory. If the card has DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied in one second. This figure is calculated by multiplying the total number of texture units by the core clock speed of the chip. The higher this number, the better the graphics card will be at 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 video card can possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour 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 lots of 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.

Comments

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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