GeForce 8800 GT 512MB vs Radeon HD 4750

Intro

Compare that to the Radeon HD 4750, which has a core clock frequency of 730 MHz and a GDDR5 memory frequency of 800 MHz. It also makes use of a 128-bit memory bus, and makes use of a 40 nm design. It features 640(128x5) SPUs, 32 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4750		75 Watts
GeForce 8800 GT 512MB		105 Watts
	Difference: 30 Watts (40%)

Memory Bandwidth

The GeForce 8800 GT 512MB, in theory, should be a little bit faster than the Radeon HD 4750 in general. (explain)

GeForce 8800 GT 512MB		57600 MB/sec
Radeon HD 4750		51200 MB/sec
	Difference: 6400 (13%)

Texel Rate

The GeForce 8800 GT 512MB should be quite a bit (approximately 44%) more effective at anisotropic filtering than the Radeon HD 4750. (explain)

GeForce 8800 GT 512MB		33600 Mtexels/sec
Radeon HD 4750		23360 Mtexels/sec
	Difference: 10240 (44%)

Pixel Rate

The Radeon HD 4750 is quite a bit (about 22%) better at anti-aliasing than the GeForce 8800 GT 512MB, and also will be able to handle higher screen resolutions more effectively. (explain)

Radeon HD 4750		11680 Mpixels/sec
GeForce 8800 GT 512MB		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 maximum amount of data (in units of MB per second) that can be transferred over the external memory interface within a second. It is worked out by multiplying the bus width by its memory speed. If the card has DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the the card's clock speed. 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 lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.