GeForce GT 320 vs Radeon HD 7950 3GB

Intro

Compare those specs to the Radeon HD 7950 3GB, which features clock 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 Texture Address Units and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 320		43 Watts
Radeon HD 7950 3GB		200 Watts
	Difference: 157 Watts (365%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7950 3GB should perform much faster than the GeForce GT 320 overall. (explain)

Radeon HD 7950 3GB		240000 MB/sec
GeForce GT 320		25280 MB/sec
	Difference: 214720 (849%)

Texel Rate

The Radeon HD 7950 3GB is much (approximately 591%) faster with regards to texture filtering than the GeForce GT 320. (explain)

Radeon HD 7950 3GB		89600 Mtexels/sec
GeForce GT 320		12960 Mtexels/sec
	Difference: 76640 (591%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 7950 3GB is the winner, and very much so. (explain)

Radeon HD 7950 3GB		25600 Mpixels/sec
GeForce GT 320		4320 Mpixels/sec
	Difference: 21280 (493%)

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 information (counted in megabytes per second) that can be transported past the external memory interface in one second. It is calculated by multiplying the interface width by its memory speed. If the card has DDR type RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied per second. This is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The higher this number, the better the graphics 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 that the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.