Radeon HD 5870 vs Radeon HD 6770

Intro

Compare those specifications to the Radeon HD 6770, which comes with a core clock speed of 900 MHz and a GDDR5 memory speed of 1050 MHz. It also features a 128-bit memory bus, and makes use of a 40 nm design. It features 800 SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6770		108 Watts
Radeon HD 5870		188 Watts
	Difference: 80 Watts (74%)

Memory Bandwidth

In theory, the Radeon HD 5870 will be 129% quicker than the Radeon HD 6770 in general, because of its greater data rate. (explain)

Radeon HD 5870		153600 MB/sec
Radeon HD 6770		67200 MB/sec
	Difference: 86400 (129%)

Texel Rate

The Radeon HD 5870 should be a lot (about 89%) more effective at AF than the Radeon HD 6770. (explain)

Radeon HD 5870		68000 Mtexels/sec
Radeon HD 6770		36000 Mtexels/sec
	Difference: 32000 (89%)

Pixel Rate

The Radeon HD 5870 will be much (about 89%) faster with regards to anti-aliasing than the Radeon HD 6770, and will be able to handle higher screen resolutions while still performing well. (explain)

Radeon HD 5870		27200 Mpixels/sec
Radeon HD 6770		14400 Mpixels/sec
	Difference: 12800 (89%)

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 information (measured in MB per second) that can be moved past the external memory interface in one second. The number is worked out by multiplying the card's bus width by its memory speed. In the case of DDR type memory, the result should be multiplied by 2 once 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 higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied per second. This is worked out by multiplying the total amount of texture units of the card 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 per second.

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