Geforce GTX 780 vs Radeon HD 7950 3GB

Intro

Compare all of that to the Radeon HD 7950 3GB, which features a clock speed of 800 MHz and a GDDR5 memory frequency of 1250 MHz. It also features a 384-bit memory bus, and makes use of a 28 nm design. It is comprised of 1792 SPUs, 112 TAUs, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7950 3GB		200 Watts
Geforce GTX 780		250 Watts
	Difference: 50 Watts (25%)

Memory Bandwidth

Performance-wise, the Geforce GTX 780 should in theory be a small bit superior to the Radeon HD 7950 3GB overall. (explain)

Geforce GTX 780		288384 MB/sec
Radeon HD 7950 3GB		240000 MB/sec
	Difference: 48384 (20%)

Texel Rate

The Geforce GTX 780 will be a lot (approximately 85%) faster with regards to texture filtering than the Radeon HD 7950 3GB. (explain)

Geforce GTX 780		165696 Mtexels/sec
Radeon HD 7950 3GB		89600 Mtexels/sec
	Difference: 76096 (85%)

Pixel Rate

If running with a high screen resolution 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 3GB		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

Specifications

Memory Bandwidth: Memory bandwidth is the maximum amount of data (counted in MB per second) that can be moved over the external memory interface in a second. It's calculated by multiplying the interface width by the speed of its memory. If the card has DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the 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 can be processed in one second. This figure is worked out by multiplying the total number of texture units by the core clock speed of the chip. The higher this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Raster Operations Pipelines by the the core 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 fill rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.