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Geforce GTX 780 vs Radeon HD 7950

Intro

The Geforce GTX 780 features clock speeds of 863 MHz on the GPU, and 1502 MHz on the 3072 MB of GDDR5 memory. It features 2304 SPUs as well as 192 TAUs and 48 ROPs.

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

(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7950 200 Watts
Geforce GTX 780 250 Watts
Difference: 50 Watts (25%)

Memory Bandwidth

Theoretically, the Geforce GTX 780 should be a little bit faster than the Radeon HD 7950 in general. (explain)

Geforce GTX 780 288384 MB/sec
Radeon HD 7950 240000 MB/sec
Difference: 48384 (20%)

Texel Rate

The Geforce GTX 780 will be a lot (about 85%) better at texture filtering than the Radeon HD 7950. (explain)

Geforce GTX 780 165696 Mtexels/sec
Radeon HD 7950 89600 Mtexels/sec
Difference: 76096 (85%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Geforce GTX 780 is the winner, and very much so. (explain)

Geforce GTX 780 41424 Mpixels/sec
Radeon HD 7950 25600 Mpixels/sec
Difference: 15824 (62%)

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

Geforce GTX 780

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 Geforce GTX 780 Radeon HD 7950
Manufacturer nVidia AMD
Year May 2013 January 2012
Code Name GK110 Tahiti Pro
Fab Process 28 nm 28 nm
Bus PCIe 3.0 x16 PCIe 3.0 x16
Memory 3072 MB 1536 MB
Core Speed 863 MHz 800 MHz
Shader Speed 863 MHz (N/A) MHz
Memory Speed 1502 MHz (6008 MHz effective) 1250 MHz (5000 MHz effective)
Unified Shaders 2304 1792
Texture Mapping Units 192 112
Render Output Units 48 32
Bus Type GDDR5 GDDR5
Bus Width 384-bit 384-bit
DirectX Version DirectX 11.0 DirectX 11.1
OpenGL Version OpenGL 4.3 OpenGL 4.2
Power (Max TDP) 250 watts 200 watts
Shader Model 5.0 5.0
Bandwidth 288384 MB/sec 240000 MB/sec
Texel Rate 165696 Mtexels/sec 89600 Mtexels/sec
Pixel Rate 41424 Mpixels/sec 25600 Mpixels/sec

Memory Bandwidth: Bandwidth is the maximum amount of data (measured in megabytes per second) that can be moved past the external memory interface within a second. It's worked out by multiplying the card's interface width by its memory speed. If the card has DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied per second. This number is calculated 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 video 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 number of pixels that the graphics card could possibly write to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

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