GeForce GTX 650 vs Radeon HD 7950 3GB

Intro

Compare those specs to the Radeon HD 7950 3GB, which uses a 28 nm design. AMD has clocked the core frequency at 800 MHz. The GDDR5 RAM runs at a speed of 1250 MHz on this particular model. It features 1792 SPUs along with 112 TAUs and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650		64 Watts
Radeon HD 7950 3GB		200 Watts
	Difference: 136 Watts (213%)

Memory Bandwidth

Theoretically, the Radeon HD 7950 3GB should perform much faster than the GeForce GTX 650 in general. (explain)

Radeon HD 7950 3GB		240000 MB/sec
GeForce GTX 650		80000 MB/sec
	Difference: 160000 (200%)

Texel Rate

The Radeon HD 7950 3GB is a lot (more or less 165%) better at texture filtering than the GeForce GTX 650. (explain)

Radeon HD 7950 3GB		89600 Mtexels/sec
GeForce GTX 650		33856 Mtexels/sec
	Difference: 55744 (165%)

Pixel Rate

The Radeon HD 7950 3GB will be much (about 51%) better at AA than the GeForce GTX 650, and capable of handling higher screen resolutions while still performing well. (explain)

Radeon HD 7950 3GB		25600 Mpixels/sec
GeForce GTX 650		16928 Mpixels/sec
	Difference: 8672 (51%)

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: Bandwidth is the maximum amount of information (counted in MB per second) that can be moved past the external memory interface in one second. It is calculated by multiplying the interface width by its memory clock speed. In the case of DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster 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 can be applied in one second. This is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka 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, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.