Radeon HD 5850 vs Radeon HD 6770

Intro

Compare those specs to the Radeon HD 6770, which comes with clock speeds of 900 MHz on the GPU, and 1050 MHz on the 512 MB of GDDR5 RAM. It features 800 SPUs as well as 40 TAUs and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6770		108 Watts
Radeon HD 5850		151 Watts
	Difference: 43 Watts (40%)

Memory Bandwidth

Performance-wise, the Radeon HD 5850 should theoretically be quite a bit superior to the Radeon HD 6770 in general. (explain)

Radeon HD 5850		128000 MB/sec
Radeon HD 6770		67200 MB/sec
	Difference: 60800 (90%)

Texel Rate

The Radeon HD 5850 will be a lot (more or less 45%) more effective at texture filtering than the Radeon HD 6770. (explain)

Radeon HD 5850		52200 Mtexels/sec
Radeon HD 6770		36000 Mtexels/sec
	Difference: 16200 (45%)

Pixel Rate

The Radeon HD 5850 should be much (approximately 61%) faster with regards to AA than the Radeon HD 6770, and also will be capable of handling higher screen resolutions without losing too much performance. (explain)

Radeon HD 5850		23200 Mpixels/sec
Radeon HD 6770		14400 Mpixels/sec
	Difference: 8800 (61%)

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 largest amount of information (in units of megabytes per second) that can be transferred across the external memory interface in a second. The number is worked out by multiplying the interface width by the speed of its memory. If it uses DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and high 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 number of texture units of the card by the core speed of the chip. The better this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.