GeForce 8800 GT 256MB vs Radeon HD 4750

Intro

Compare those specs to the Radeon HD 4750, which has GPU core speed of 730 MHz, and 512 MB of GDDR5 memory set to run at 800 MHz through a 128-bit bus. It also is comprised of 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 GT 256MB		105 Watts
	Difference: 30 Watts (40%)

Memory Bandwidth

Theoretically, the Radeon HD 4750 should perform a little bit faster than the GeForce 8800 GT 256MB overall. (explain)

Radeon HD 4750		51200 MB/sec
GeForce 8800 GT 256MB		44800 MB/sec
	Difference: 6400 (14%)

Texel Rate

The GeForce 8800 GT 256MB will be much (more or less 44%) faster with regards to anisotropic filtering than the Radeon HD 4750. (explain)

GeForce 8800 GT 256MB		33600 Mtexels/sec
Radeon HD 4750		23360 Mtexels/sec
	Difference: 10240 (44%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon HD 4750 is the winner, and very much so. (explain)

Radeon HD 4750		11680 Mpixels/sec
GeForce 8800 GT 256MB		9600 Mpixels/sec
	Difference: 2080 (22%)

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 largest amount of data (measured in megabytes per second) that can be transported past the external memory interface in a second. The number is worked out by multiplying the bus width by its memory clock speed. In the case of DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied in one second. This figure is calculated by multiplying the total texture units of the card by the core speed of the chip. The better the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on many 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.