GeForce GT 320 vs Radeon HD 7970

Intro

Compare all that to the Radeon HD 7970, which features a core clock speed of 925 MHz and a GDDR5 memory speed of 1375 MHz. It also uses a 384-bit memory bus, and uses a 28 nm design. It is made up of 2048 SPUs, 128 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 7970		250 Watts
	Difference: 207 Watts (481%)

Memory Bandwidth

As far as performance goes, the Radeon HD 7970 should in theory be a lot better than the GeForce GT 320 in general. (explain)

Radeon HD 7970		264000 MB/sec
GeForce GT 320		25280 MB/sec
	Difference: 238720 (944%)

Texel Rate

The Radeon HD 7970 will be a lot (about 814%) more effective at AF than the GeForce GT 320. (explain)

Radeon HD 7970		118400 Mtexels/sec
GeForce GT 320		12960 Mtexels/sec
	Difference: 105440 (814%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 7970 is superior to the GeForce GT 320, by far. (explain)

Radeon HD 7970		29600 Mpixels/sec
GeForce GT 320		4320 Mpixels/sec
	Difference: 25280 (585%)

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 (measured in megabytes per second) that can be moved over the external memory interface in a second. It's worked out by multiplying the interface width by the speed of its memory. If it uses DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better 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 amount of texture map elements (texels) that can be applied per second. This is calculated by multiplying the total number of texture units by the core clock speed of the chip. The better 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 one second.

Pixel Rate: Pixel rate is the maximum number of pixels 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 Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.