GeForce GTX 650 vs Radeon HD 7950 3GB

Intro

Compare those specifications to the Radeon HD 7950 3GB, which features core speeds of 800 MHz on the GPU, and 1250 MHz on the 3072 MB of GDDR5 memory. It features 1792 SPUs as well as 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

The Radeon HD 7950 3GB, in theory, should be 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%) more effective at AF 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 much (about 51%) better at anti-aliasing than the GeForce GTX 650, and also will be able to handle higher screen resolutions better. (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 max amount of information (in units of megabytes per second) that can be moved over the external memory interface in one second. It's worked out by multiplying the interface width by the speed of its memory. If it uses DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This number is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount 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 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 max fill rate.