GeForce GTX 650 vs Radeon HD 7950 3GB

Intro

Compare all that to the Radeon HD 7950 3GB, which has clock speeds of 800 MHz on the GPU, and 1250 MHz on the 3072 MB of GDDR5 RAM. It features 1792 SPUs as well as 112 Texture Address Units and 32 Rasterization Operator Units.

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 speaking, the Radeon HD 7950 3GB will be 200% faster than the GeForce GTX 650 overall, due to its higher data rate. (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 (approximately 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 is a lot (more or less 51%) more effective at anti-aliasing than the GeForce GTX 650, and also should be able to handle higher 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: Memory bandwidth is the maximum amount of data (counted in megabytes per second) that can be transported past the external memory interface in a second. The number is calculated by multiplying the card's bus width by the speed of its memory. If it uses DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better 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 amount of texture map elements (texels) that are processed in one second. This number 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 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 the graphics card can possibly write to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.