GeForce GTX 480 vs Radeon HD 4750

Intro

Compare all of that to the Radeon HD 4750, which comes with a GPU core 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) Stream Processors, 32 TAUs, and 16 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4750		75 Watts
GeForce GTX 480		250 Watts
	Difference: 175 Watts (233%)

Memory Bandwidth

The GeForce GTX 480, in theory, should be much faster than the Radeon HD 4750 overall. (explain)

GeForce GTX 480		177408 MB/sec
Radeon HD 4750		51200 MB/sec
	Difference: 126208 (247%)

Texel Rate

The GeForce GTX 480 is quite a bit (about 80%) better at texture filtering than the Radeon HD 4750. (explain)

GeForce GTX 480		42000 Mtexels/sec
Radeon HD 4750		23360 Mtexels/sec
	Difference: 18640 (80%)

Pixel Rate

The GeForce GTX 480 should be much (more or less 188%) more effective at FSAA than the Radeon HD 4750, and also will be capable of handling higher resolutions without slowing down too much. (explain)

GeForce GTX 480		33600 Mpixels/sec
Radeon HD 4750		11680 Mpixels/sec
	Difference: 21920 (188%)

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 information (measured in megabytes per second) that can be transferred over the external memory interface in one second. It's calculated by multiplying the bus width by its memory clock speed. If it uses DDR type RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly record to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.