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Geforce GTX 780 vs Radeon HD 7950

Intro

The Geforce GTX 780 has a clock speed of 863 MHz and a GDDR5 memory speed of 1502 MHz. It also uses a 384-bit bus, and uses a 28 nm design. It is made up of 2304 SPUs, 192 TAUs, and 48 Raster Operation Units.

Compare those specs to the Radeon HD 7950, which uses a 28 nm design. AMD has clocked the core speed at 800 MHz. The GDDR5 RAM works at a speed of 1250 MHz on this specific model. It features 1792 SPUs along with 112 TAUs and 32 ROPs.

(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

Performance-wise, the Geforce GTX 780 should theoretically be a bit superior to the Radeon HD 7950 overall. (explain)

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

Texel Rate

The Geforce GTX 780 is quite a bit (more or less 85%) faster with regards to AF than the Radeon HD 7950. (explain)

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

Pixel Rate

The Geforce GTX 780 will be much (more or less 62%) faster with regards to AA than the Radeon HD 7950, and also capable of handling higher screen resolutions without slowing down too much. (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: Memory bandwidth is the max amount of information (in units of megabytes per second) that can be transferred past the external memory interface in a second. It's calculated by multiplying the interface width by the speed of its memory. In the case of DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's 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 number of texture map elements (texels) that are applied per second. This figure is worked out by multiplying the total texture units of the card by the core speed of the chip. The higher the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly record to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units 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 is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.

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