Radeon HD 4750 vs Radeon HD 6970

Intro

Compare that to the Radeon HD 6970, which comes with core speeds of 880 MHz on the GPU, and 1375 MHz on the 2048 MB of GDDR5 memory. It features 1536 SPUs as well as 96 TAUs and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4750		75 Watts
Radeon HD 6970		250 Watts
	Difference: 175 Watts (233%)

Memory Bandwidth

As far as performance goes, the Radeon HD 6970 should theoretically be much superior to the Radeon HD 4750 in general. (explain)

Radeon HD 6970		176000 MB/sec
Radeon HD 4750		51200 MB/sec
	Difference: 124800 (244%)

Texel Rate

The Radeon HD 6970 is a lot (about 262%) better at AF than the Radeon HD 4750. (explain)

Radeon HD 6970		84480 Mtexels/sec
Radeon HD 4750		23360 Mtexels/sec
	Difference: 61120 (262%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 6970 is the winner, by far. (explain)

Radeon HD 6970		28160 Mpixels/sec
Radeon HD 4750		11680 Mpixels/sec
	Difference: 16480 (141%)

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 information (in units of MB per second) that can be transferred across the external memory interface in one second. It's calculated by multiplying the interface width by its memory speed. If the card has DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range 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 calculated by multiplying the total texture units of the card by the core speed of the chip. The higher this number, the better the graphics 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 most pixels that the graphics chip could possibly write to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.