Radeon HD 4750 vs Radeon HD 5970

Intro

Compare those specs to the Radeon HD 5970, which features clock speeds of 725 MHz on the GPU, and 1000 MHz on the 1024 MB of GDDR5 RAM. It features 1600 SPUs as well as 160 TAUs and 64 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4750		75 Watts
Radeon HD 5970		294 Watts
	Difference: 219 Watts (292%)

Memory Bandwidth

The Radeon HD 5970, in theory, should be quite a bit faster than the Radeon HD 4750 overall. (explain)

Radeon HD 5970		256000 MB/sec
Radeon HD 4750		51200 MB/sec
	Difference: 204800 (400%)

Texel Rate

The Radeon HD 5970 should be quite a bit (about 893%) better at texture filtering than the Radeon HD 4750. (explain)

Radeon HD 5970		232000 Mtexels/sec
Radeon HD 4750		23360 Mtexels/sec
	Difference: 208640 (893%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 5970 is superior to the Radeon HD 4750, by far. (explain)

Radeon HD 5970		92800 Mpixels/sec
Radeon HD 4750		11680 Mpixels/sec
	Difference: 81120 (695%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Specifications

Memory Bandwidth: Bandwidth is the largest amount of data (measured in megabytes per second) that can be transferred past the external memory interface in one second. The number is worked out by multiplying the bus width by the speed of its memory. If the card has DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, 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 figure is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The better this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly write to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called 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 - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.