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Radeon HD 6950 2GB vs Radeon R9 390 8G

Intro

The Radeon HD 6950 2GB comes with a GPU core speed of 800 MHz, and the 2048 MB of GDDR5 memory is set to run at 1250 MHz through a 256-bit bus. It also features 1408 SPUs, 88 Texture Address Units, and 32 ROPs.

Compare all that to the Radeon R9 390 8G, which features GPU clock speed of 1000 MHz, and 8192 MB of GDDR5 memory set to run at 1500 MHz through a 512-bit bus. It also features 2560 Stream Processors, 160 TAUs, and 64 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6950 2GB 200 Watts
Radeon R9 390 8G 275 Watts
Difference: 75 Watts (38%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 390 8G will be 140% faster than the Radeon HD 6950 2GB overall, due to its higher bandwidth. (explain)

Radeon R9 390 8G 384000 MB/sec
Radeon HD 6950 2GB 160000 MB/sec
Difference: 224000 (140%)

Texel Rate

The Radeon R9 390 8G will be much (about 127%) better at AF than the Radeon HD 6950 2GB. (explain)

Radeon R9 390 8G 160000 Mtexels/sec
Radeon HD 6950 2GB 70400 Mtexels/sec
Difference: 89600 (127%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon R9 390 8G is a better choice, and very much so. (explain)

Radeon R9 390 8G 64000 Mpixels/sec
Radeon HD 6950 2GB 25600 Mpixels/sec
Difference: 38400 (150%)

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 2GB

Amazon.com

Check prices at:

Radeon R9 390 8G

Amazon.com

Check prices at:

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 2GB Radeon R9 390 8G
Manufacturer AMD AMD
Year December 2010 June 2015
Code Name Cayman Pro Grenada PRO
Memory 2048 MB 8192 MB
Core Speed 800 MHz 1000 MHz
Memory Speed 5000 MHz 6000 MHz
Power (Max TDP) 200 watts 275 watts
Bandwidth 160000 MB/sec 384000 MB/sec
Texel Rate 70400 Mtexels/sec 160000 Mtexels/sec
Pixel Rate 25600 Mpixels/sec 64000 Mpixels/sec
Unified Shaders 1408 2560
Texture Mapping Units 88 160
Render Output Units 32 64
Bus Type GDDR5 GDDR5
Bus Width 256-bit 512-bit
Fab Process 40 nm 28 nm
Transistors 2640 million 6200 million
Bus PCIe x16 PCIe 3.0 ×16
DirectX Version DirectX 11 DirectX 12.0
OpenGL Version OpenGL 4.1 OpenGL 4.5

Memory Bandwidth: Bandwidth is the maximum amount of data (in units of megabytes per second) that can be moved over the external memory interface in one second. It's calculated by multiplying the interface width by its memory clock speed. In the case of DDR type RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

Hide Prices

Radeon HD 6950 2GB

Amazon.com

Check prices at:

Radeon R9 390 8G

Amazon.com

Check prices at:

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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