GeForce 8800 GTS (G92) vs Radeon HD 4750

Intro

Compare those specs to the Radeon HD 4750, which comes with a core clock frequency of 730 MHz and a GDDR5 memory speed of 800 MHz. It also makes use of a 128-bit bus, and uses a 40 nm design. It features 640(128x5) SPUs, 32 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4750		75 Watts
GeForce 8800 GTS (G92)		135 Watts
	Difference: 60 Watts (80%)

Memory Bandwidth

As far as performance goes, the GeForce 8800 GTS (G92) should theoretically be a lot superior to the Radeon HD 4750 overall. (explain)

GeForce 8800 GTS (G92)		62080 MB/sec
Radeon HD 4750		51200 MB/sec
	Difference: 10880 (21%)

Texel Rate

The GeForce 8800 GTS (G92) should be much (more or less 78%) more effective at texture filtering than the Radeon HD 4750. (explain)

GeForce 8800 GTS (G92)		41600 Mtexels/sec
Radeon HD 4750		23360 Mtexels/sec
	Difference: 18240 (78%)

Pixel Rate

The Radeon HD 4750 will be just a bit (about 12%) faster with regards to anti-aliasing than the GeForce 8800 GTS (G92), and also should be able to handle higher resolutions without losing too much performance. (explain)

Radeon HD 4750		11680 Mpixels/sec
GeForce 8800 GTS (G92)		10400 Mpixels/sec
	Difference: 1280 (12%)

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 largest amount of data (in units of MB per second) that can be transferred past the external memory interface within a second. It's calculated by multiplying the bus width by its memory clock speed. In the case of DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. 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 can be processed per second. This figure is calculated by multiplying the total number of texture units by the core speed of the chip. The better the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one 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 clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.