Radeon HD 4770 vs Radeon HD 5670

Intro

Compare those specs to the Radeon HD 5670, which has a clock frequency of 775 MHz and a GDDR5 memory speed of 1000 MHz. It also uses a 128-bit memory bus, and uses a 40 nm design. It is made up of 400(80x5) SPUs, 20 TAUs, 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 4770		80 Watts
	Difference: 19 Watts (31%)

Memory Bandwidth

Performance-wise, the Radeon HD 5670 should theoretically be much superior to the Radeon HD 4770 in general. (explain)

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

Texel Rate

The Radeon HD 4770 is quite a bit (approximately 55%) faster with regards to AF than the Radeon HD 5670. (explain)

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

Pixel Rate

The Radeon HD 4770 should be a lot (approximately 94%) better at AA than the Radeon HD 5670, and also should be able to handle higher resolutions while still performing well. (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: Memory bandwidth is the maximum amount of data (in units of MB per second) that can be transferred over the external memory interface within a second. The number is worked out by multiplying the card's bus width by its memory clock speed. If the card has DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly write to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.