Radeon HD 4750 vs Radeon HD 6970

Intro

Compare that to the Radeon HD 6970, which comes with a core clock frequency of 880 MHz and a GDDR5 memory speed of 1375 MHz. It also makes use of a 256-bit bus, and uses a 40 nm design. It is made up of 1536 SPUs, 96 Texture Address Units, and 32 Raster Operation Units.

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

Theoretically speaking, the Radeon HD 6970 should be a lot faster than 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 will be much (about 262%) better at texture filtering 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 lots of anti-aliasing is important to you, then the Radeon HD 6970 is a better choice, by a large margin. (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 largest amount of data (counted in MB per second) that can be transported past the external memory interface within a second. It's calculated by multiplying the card's bus width by its memory speed. If the card has DDR memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly write to its local memory in a second - measured in millions of pixels per second. The figure is worked out 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 filling the screen with pixels (the image). The actual pixel output rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.