GeForce 8800 GTS (G80) 320MB vs Radeon HD 4750

Intro

Compare all of that to the Radeon HD 4750, which features a GPU core clock speed of 730 MHz, and 512 MB of GDDR5 RAM running at 800 MHz through a 128-bit bus. It also is comprised of 640(128x5) Stream Processors, 32 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4750		75 Watts
GeForce 8800 GTS (G80) 320MB		143 Watts
	Difference: 68 Watts (91%)

Memory Bandwidth

As far as performance goes, the GeForce 8800 GTS (G80) 320MB should in theory be much better than the Radeon HD 4750 in general. (explain)

GeForce 8800 GTS (G80) 320MB		63360 MB/sec
Radeon HD 4750		51200 MB/sec
	Difference: 12160 (24%)

Texel Rate

The GeForce 8800 GTS (G80) 320MB is a little bit (about 5%) faster with regards to AF than the Radeon HD 4750. (explain)

GeForce 8800 GTS (G80) 320MB		24624 Mtexels/sec
Radeon HD 4750		23360 Mtexels/sec
	Difference: 1264 (5%)

Pixel Rate

The Radeon HD 4750 is just a bit (approximately 14%) faster with regards to full screen anti-aliasing than the GeForce 8800 GTS (G80) 320MB, and also should be able to handle higher screen resolutions without slowing down too much. (explain)

Radeon HD 4750		11680 Mpixels/sec
GeForce 8800 GTS (G80) 320MB		10260 Mpixels/sec
	Difference: 1420 (14%)

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 transported past the external memory interface in one second. The number is worked out by multiplying the interface width by its memory clock speed. In the case of DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed in one second. This figure is worked out by multiplying the total texture units by the core clock speed of the chip. The better this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly write to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.