Radeon HD 4750 vs Radeon HD 5670

Intro

Compare those specifications to the Radeon HD 5670, which has GPU core speed of 775 MHz, and 1024 MB of GDDR5 memory set to run at 1000 MHz through a 128-bit bus. It also is made up of 400(80x5) SPUs, 20 Texture Address Units, and 8 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5670		61 Watts
Radeon HD 4750		75 Watts
	Difference: 14 Watts (23%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 5670 will be 25% faster than the Radeon HD 4750 in general, due to its higher bandwidth. (explain)

Radeon HD 5670		64000 MB/sec
Radeon HD 4750		51200 MB/sec
	Difference: 12800 (25%)

Texel Rate

The Radeon HD 4750 is much (about 51%) more effective at texture filtering than the Radeon HD 5670. (explain)

Radeon HD 4750		23360 Mtexels/sec
Radeon HD 5670		15500 Mtexels/sec
	Difference: 7860 (51%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 4750 is a better choice, by far. (explain)

Radeon HD 4750		11680 Mpixels/sec
Radeon HD 5670		6200 Mpixels/sec
	Difference: 5480 (88%)

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 megabytes per second) that can be transferred across the external memory interface within a second. It's worked out by multiplying the interface width by the speed of its memory. If it uses DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly record to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.