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Radeon HD 6950 vs Radeon HD 7770

Intro

The Radeon HD 6950 has a core clock speed of 800 MHz and a GDDR5 memory speed of 1250 MHz. It also uses a 256-bit bus, and makes use of a 40 nm design. It features 1408 SPUs, 88 Texture Address Units, and 32 ROPs.

Compare those specs to the Radeon HD 7770, which has GPU clock speed of 1000 MHz, and 1024 MB of GDDR5 RAM set to run at 1125 MHz through a 128-bit bus. It also is comprised of 640 SPUs, 40 TAUs, and 16 ROPs.

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

Radeon HD 6950 3240 points
Radeon HD 7770 3180 points
Difference: 60 (2%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7770 80 Watts
Radeon HD 6950 200 Watts
Difference: 120 Watts (150%)

Memory Bandwidth

In theory, the Radeon HD 6950 should perform quite a bit faster than the Radeon HD 7770 in general. (explain)

Radeon HD 6950 160000 MB/sec
Radeon HD 7770 72000 MB/sec
Difference: 88000 (122%)

Texel Rate

The Radeon HD 6950 will be a lot (approximately 76%) more effective at AF than the Radeon HD 7770. (explain)

Radeon HD 6950 70400 Mtexels/sec
Radeon HD 7770 40000 Mtexels/sec
Difference: 30400 (76%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 6950 is the winner, by a large margin. (explain)

Radeon HD 6950 25600 Mpixels/sec
Radeon HD 7770 16000 Mpixels/sec
Difference: 9600 (60%)

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 6950

Amazon.com

Radeon HD 7770

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 6950 Radeon HD 7770
Manufacturer AMD AMD
Year December 2010 February 2012
Code Name Cayman Pro Cape Verde XT
Memory 1024 MB 1024 MB
Core Speed 800 MHz 1000 MHz
Memory Speed 5000 MHz 4500 MHz
Power (Max TDP) 200 watts 80 watts
Bandwidth 160000 MB/sec 72000 MB/sec
Texel Rate 70400 Mtexels/sec 40000 Mtexels/sec
Pixel Rate 25600 Mpixels/sec 16000 Mpixels/sec
Unified Shaders 1408 640
Texture Mapping Units 88 40
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 data (counted in megabytes per second) that can be transferred over the external memory interface in one second. It's calculated by multiplying the bus width by the speed of its memory. If the card has DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better 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 per second. This figure is calculated by multiplying the total texture units 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 a second.

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

Display Prices

Hide Prices

Radeon HD 6950

Amazon.com

Radeon HD 7770

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.

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