GeForce GT 320 vs Radeon HD 4890 2GB

Intro

Compare those specs to the Radeon HD 4890 2GB, which comes with GPU core speed of 1000 MHz, and 2048 MB of GDDR5 memory running at 975 MHz through a 256-bit bus. It also is comprised of 800(160x5) SPUs, 40 TAUs, 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 4890 2GB		190 Watts
	Difference: 147 Watts (342%)

Memory Bandwidth

In theory, the Radeon HD 4890 2GB should perform a lot faster than the GeForce GT 320 in general. (explain)

Radeon HD 4890 2GB		124800 MB/sec
GeForce GT 320		25280 MB/sec
	Difference: 99520 (394%)

Texel Rate

The Radeon HD 4890 2GB should be quite a bit (about 209%) faster with regards to anisotropic filtering than the GeForce GT 320. (explain)

Radeon HD 4890 2GB		40000 Mtexels/sec
GeForce GT 320		12960 Mtexels/sec
	Difference: 27040 (209%)

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 4890 2GB is the winner, and very much so. (explain)

Radeon HD 4890 2GB		16000 Mpixels/sec
GeForce GT 320		4320 Mpixels/sec
	Difference: 11680 (270%)

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 information (in units of MB per second) that can be transported across the external memory interface within a second. It is worked out by multiplying the interface width by the speed of its memory. If the card has DDR type RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster 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 are processed in one second. This number is worked out by multiplying the total texture units by the core clock speed of the chip. The higher the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.