GeForce GT 320 vs Radeon HD 4830 512MB

Intro

Compare those specs to the Radeon HD 4830 512MB, which features clock speeds of 575 MHz on the GPU, and 900 MHz on the 512 MB of GDDR3 memory. It features 640(128x5) SPUs along with 32 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 320		43 Watts
Radeon HD 4830 512MB		95 Watts
	Difference: 52 Watts (121%)

Memory Bandwidth

As far as performance goes, the Radeon HD 4830 512MB should theoretically be much better than the GeForce GT 320 in general. (explain)

Radeon HD 4830 512MB		57600 MB/sec
GeForce GT 320		25280 MB/sec
	Difference: 32320 (128%)

Texel Rate

The Radeon HD 4830 512MB is much (more or less 42%) more effective at texture filtering than the GeForce GT 320. (explain)

Radeon HD 4830 512MB		18400 Mtexels/sec
GeForce GT 320		12960 Mtexels/sec
	Difference: 5440 (42%)

Pixel Rate

The Radeon HD 4830 512MB will be quite a bit (more or less 113%) faster with regards to FSAA than the GeForce GT 320, and also will be able to handle higher resolutions without losing too much performance. (explain)

Radeon HD 4830 512MB		9200 Mpixels/sec
GeForce GT 320		4320 Mpixels/sec
	Difference: 4880 (113%)

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 (counted in megabytes per second) that can be moved over the external memory interface within a second. It's calculated by multiplying the card's bus width by its memory speed. In the case of DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, 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 amount of texture map elements (texels) that can be applied per 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 card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly write to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.