Radeon HD 4750 vs Radeon HD 5670

Intro

Compare those specifications to the Radeon HD 5670, which uses a 40 nm design. AMD has clocked the core speed at 775 MHz. The GDDR5 memory is set to run at a frequency of 1000 MHz on this card. It features 400(80x5) SPUs as well as 20 Texture Address Units and 8 ROPs.

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

Performance-wise, the Radeon HD 5670 should in theory be much superior to the Radeon HD 4750 in general. (explain)

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

Texel Rate

The Radeon HD 4750 will be quite a bit (approximately 51%) more effective at AF 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 a high screen resolution is important to you, then the Radeon HD 4750 is superior to the Radeon HD 5670, 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 max amount of data (measured in MB per second) that can be transferred past the external memory interface in a second. It's calculated by multiplying the card's bus width by its memory speed. If the card has DDR type RAM, it should be multiplied by 2 again. If 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, 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 number is worked out by multiplying the total texture units of the card by the core speed of the chip. The higher the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. 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 bandwidth is, the lower the potential to get to the max fill rate.