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Radeon HD 6790 vs Radeon HD 7950

Intro

The Radeon HD 6790 comes with a GPU core speed of 840 MHz, and the 1024 MB of GDDR5 memory is set to run at 1050 MHz through a 256-bit bus. It also features 800 Stream Processors, 40 TAUs, and 16 Raster Operation Units.

Compare those specifications to the Radeon HD 7950, which features core clock speeds of 800 MHz on the GPU, and 1250 MHz on the 1536 MB of GDDR5 memory. It features 1792 SPUs along with 112 TAUs and 32 Rasterization Operator Units.

(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6790 150 Watts
Radeon HD 7950 200 Watts
Difference: 50 Watts (33%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7950 should be much faster than the Radeon HD 6790 overall. (explain)

Radeon HD 7950 240000 MB/sec
Radeon HD 6790 134400 MB/sec
Difference: 105600 (79%)

Texel Rate

The Radeon HD 7950 should be quite a bit (approximately 167%) faster with regards to anisotropic filtering than the Radeon HD 6790. (explain)

Radeon HD 7950 89600 Mtexels/sec
Radeon HD 6790 33600 Mtexels/sec
Difference: 56000 (167%)

Pixel Rate

The Radeon HD 7950 will be a lot (approximately 90%) faster with regards to FSAA than the Radeon HD 6790, and also will be capable of handling higher resolutions more effectively. (explain)

Radeon HD 7950 25600 Mpixels/sec
Radeon HD 6790 13440 Mpixels/sec
Difference: 12160 (90%)

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 6790

Amazon.com

Radeon HD 7950

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

Model Radeon HD 6790 Radeon HD 7950
Manufacturer AMD AMD
Year April 2011 January 2012
Code Name Barts LE Tahiti Pro
Fab Process 40 nm 28 nm
Bus PCIe 2.1 x16 PCIe 3.0 x16
Memory 1024 MB 1536 MB
Core Speed 840 MHz 800 MHz
Shader Speed N/A MHz (N/A) MHz
Memory Speed 1050 MHz (4200 MHz effective) 1250 MHz (5000 MHz effective)
Unified Shaders 800 1792
Texture Mapping Units 40 112
Render Output Units 16 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 384-bit
DirectX Version DirectX 11 DirectX 11.1
OpenGL Version OpenGL 4.1 OpenGL 4.2
Power (Max TDP) 150 watts 200 watts
Shader Model 5.0 5.0
Bandwidth 134400 MB/sec 240000 MB/sec
Texel Rate 33600 Mtexels/sec 89600 Mtexels/sec
Pixel Rate 13440 Mpixels/sec 25600 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the maximum amount of information (measured in MB per second) that can be moved over the external memory interface within a second. It is calculated by multiplying the bus width by its memory speed. If the card has DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better 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 are processed in one second. This figure is calculated by multiplying the total number of texture units by the core speed of the chip. The better the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output 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 get to the maximum fill rate.

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