Geforce GTX 690 vs Radeon HD 7950 3GB

Intro

Compare those specs to the Radeon HD 7950 3GB, which has a core clock speed of 800 MHz and a GDDR5 memory speed of 1250 MHz. It also makes use of a 384-bit bus, and uses a 28 nm design. It is made up 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 690		300 Watts
	Difference: 100 Watts (50%)

Memory Bandwidth

Performance-wise, the Geforce GTX 690 should in theory be much superior to the Radeon HD 7950 3GB in general. (explain)

Geforce GTX 690		384512 MB/sec
Radeon HD 7950 3GB		240000 MB/sec
	Difference: 144512 (60%)

Texel Rate

The Geforce GTX 690 should be a lot (more or less 161%) more effective at texture filtering than the Radeon HD 7950 3GB. (explain)

Geforce GTX 690		234240 Mtexels/sec
Radeon HD 7950 3GB		89600 Mtexels/sec
	Difference: 144640 (161%)

Pixel Rate

The Geforce GTX 690 should be much (approximately 129%) faster with regards to full screen anti-aliasing than the Radeon HD 7950 3GB, and should be capable of handling higher resolutions better. (explain)

Geforce GTX 690		58560 Mpixels/sec
Radeon HD 7950 3GB		25600 Mpixels/sec
	Difference: 32960 (129%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Specifications

Memory Bandwidth: Memory bandwidth is the max amount of information (counted in MB per second) that can be transferred past the external memory interface in one second. It's worked out by multiplying the card's interface width by its memory clock speed. In the case of DDR type RAM, the result should be multiplied by 2 again. If it uses 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 high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This number is calculated by multiplying the total number of texture units by the core clock speed of the chip. The higher the texel rate, the better the 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 most pixels that the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.