GeForce 8800 GT 256MB vs Radeon HD 4750

Intro

Compare all of that to the Radeon HD 4750, which comes with GPU clock speed of 730 MHz, and 512 MB of GDDR5 RAM 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 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 GT 256MB		105 Watts
	Difference: 30 Watts (40%)

Memory Bandwidth

Theoretically, the Radeon HD 4750 should perform just a 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 a lot (about 44%) more effective at texture 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

The Radeon HD 4750 will be quite a bit (approximately 22%) better at AA than the GeForce 8800 GT 256MB, and able to handle higher resolutions more effectively. (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: Bandwidth is the max amount of data (measured in MB per second) that can be transported over the external memory interface within a second. It's calculated by multiplying the bus width by its memory speed. If it uses DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly record to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.