Radeon HD 4770 vs Radeon HD 5670

Intro

Compare that to the Radeon HD 5670, which uses a 40 nm design. AMD has clocked the core frequency at 775 MHz. The GDDR5 RAM works at a speed of 1000 MHz on this specific card. It features 400(80x5) SPUs as well as 20 TAUs 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 4770		80 Watts
	Difference: 19 Watts (31%)

Memory Bandwidth

As far as performance goes, the Radeon HD 5670 should in theory be much better than the Radeon HD 4770 overall. (explain)

Radeon HD 5670		64000 MB/sec
Radeon HD 4770		51200 MB/sec
	Difference: 12800 (25%)

Texel Rate

The Radeon HD 4770 is much (approximately 55%) better at anisotropic filtering than the Radeon HD 5670. (explain)

Radeon HD 4770		24000 Mtexels/sec
Radeon HD 5670		15500 Mtexels/sec
	Difference: 8500 (55%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 4770 is the winner, by far. (explain)

Radeon HD 4770		12000 Mpixels/sec
Radeon HD 5670		6200 Mpixels/sec
	Difference: 5800 (94%)

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 data (in units of MB per second) that can be moved across the external memory interface in one second. It's worked out by multiplying the card's bus width by its memory clock speed. If the card has DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly write to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs 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 also depends on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.