Radeon HD 5550 vs Radeon HD 6770

Intro

Compare those specifications to the Radeon HD 6770, which features GPU core speed of 900 MHz, and 512 MB of GDDR5 RAM running at 1050 MHz through a 128-bit bus. It also is comprised of 800 SPUs, 40 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically, the Radeon HD 6770 should be quite a bit faster than the Radeon HD 5550 in general. (explain)

Radeon HD 6770		67200 MB/sec
Radeon HD 5550		12800 MB/sec
	Difference: 54400 (425%)

Texel Rate

The Radeon HD 6770 should be quite a bit (about 309%) better at texture filtering than the Radeon HD 5550. (explain)

Radeon HD 6770		36000 Mtexels/sec
Radeon HD 5550		8800 Mtexels/sec
	Difference: 27200 (309%)

Pixel Rate

The Radeon HD 6770 is quite a bit (approximately 227%) more effective at anti-aliasing than the Radeon HD 5550, and should be capable of handling higher screen resolutions more effectively. (explain)

Radeon HD 6770		14400 Mpixels/sec
Radeon HD 5550		4400 Mpixels/sec
	Difference: 10000 (227%)

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 max amount of information (measured in MB per second) that can be transferred over the external memory interface in one second. The number is worked out by multiplying the card's interface width by the speed of its memory. In the case of DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied per second. This figure is calculated by multiplying the total number of texture units of the card by the core 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 a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly write to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. 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 rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.