GeForce GT 320 vs Radeon HD 6790

Intro

Compare those specs to the Radeon HD 6790, which has a core clock frequency of 840 MHz and a GDDR5 memory frequency of 1050 MHz. It also makes use of a 256-bit bus, and uses a 40 nm design. It is comprised of 800 SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 320		43 Watts
Radeon HD 6790		150 Watts
	Difference: 107 Watts (249%)

Memory Bandwidth

The Radeon HD 6790, in theory, should perform much faster than the GeForce GT 320 overall. (explain)

Radeon HD 6790		134400 MB/sec
GeForce GT 320		25280 MB/sec
	Difference: 109120 (432%)

Texel Rate

The Radeon HD 6790 is quite a bit (about 159%) more effective at anisotropic filtering than the GeForce GT 320. (explain)

Radeon HD 6790		33600 Mtexels/sec
GeForce GT 320		12960 Mtexels/sec
	Difference: 20640 (159%)

Pixel Rate

The Radeon HD 6790 is much (about 211%) faster with regards to FSAA than the GeForce GT 320, and capable of handling higher resolutions more effectively. (explain)

Radeon HD 6790		13440 Mpixels/sec
GeForce GT 320		4320 Mpixels/sec
	Difference: 9120 (211%)

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 max amount of data (counted in MB per second) that can be transferred past the external memory interface in one second. The number is calculated by multiplying the bus width by its memory speed. If it uses DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This figure is calculated by multiplying the total amount of texture units by the core speed of the chip. The higher this number, the better the graphics 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 that the graphics chip can possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.