Radeon HD 5550 vs Radeon HD 5770

Intro

Compare all of that to the Radeon HD 5770, which uses a 40 nm design. AMD has clocked the core frequency at 850 MHz. The GDDR5 memory is set to run at a speed of 1200 MHz on this model. It features 800(160x5) SPUs along with 40 TAUs and 16 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the Radeon HD 5770 will be 500% quicker than the Radeon HD 5550 in general, due to its greater bandwidth. (explain)

Radeon HD 5770		76800 MB/sec
Radeon HD 5550		12800 MB/sec
	Difference: 64000 (500%)

Texel Rate

The Radeon HD 5770 will be quite a bit (more or less 286%) better at texture filtering than the Radeon HD 5550. (explain)

Radeon HD 5770		34000 Mtexels/sec
Radeon HD 5550		8800 Mtexels/sec
	Difference: 25200 (286%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 5770 is superior to the Radeon HD 5550, and very much so. (explain)

Radeon HD 5770		13600 Mpixels/sec
Radeon HD 5550		4400 Mpixels/sec
	Difference: 9200 (209%)

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 max amount of data (measured in MB per second) that can be moved over the external memory interface in one second. It is calculated by multiplying the bus width by its memory clock speed. If it uses DDR type RAM, it must be multiplied by 2 again. If it uses 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 higher screen resolutions.

Texel Rate: Texel rate is the maximum 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 clock speed of the chip. The better the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also 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, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.