GeForce GT 320 vs Radeon HD 6790

Intro

Compare those specifications to the Radeon HD 6790, which comes with a clock speed of 840 MHz and a GDDR5 memory frequency of 1050 MHz. It also makes use of a 256-bit bus, and makes use of a 40 nm design. It features 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

As far as performance goes, the Radeon HD 6790 should in theory be much superior to 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 should be quite a bit (approximately 159%) faster with regards to 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 will be a lot (about 211%) more effective at anti-aliasing than the GeForce GT 320, and able to handle higher screen resolutions without losing too much performance. (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 maximum amount of data (measured in MB per second) that can be transported past the external memory interface in one second. It is worked out by multiplying the bus width by the speed of its memory. In the case of DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This number is worked out by multiplying the total amount of texture units by the core speed of the chip. The higher the texel rate, the better the 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 that the graphics card could possibly record 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 card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.