Radeon HD 5550 vs Radeon HD 6770 1GB

Intro

Compare all that to the Radeon HD 6770 1GB, which has GPU core speed of 900 MHz, and 1024 MB of GDDR5 memory running at 1050 MHz through a 128-bit bus. It also is made up of 800 Stream Processors, 40 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon HD 6770 1GB should be 425% quicker than the Radeon HD 5550 in general, because of its higher bandwidth. (explain)

Radeon HD 6770 1GB		67200 MB/sec
Radeon HD 5550		12800 MB/sec
	Difference: 54400 (425%)

Texel Rate

The Radeon HD 6770 1GB should be much (about 309%) more effective at AF than the Radeon HD 5550. (explain)

Radeon HD 6770 1GB		36000 Mtexels/sec
Radeon HD 5550		8800 Mtexels/sec
	Difference: 27200 (309%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 6770 1GB is superior to the Radeon HD 5550, by a large margin. (explain)

Radeon HD 6770 1GB		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: Bandwidth is the largest amount of information (in units of MB per second) that can be transferred over the external memory interface within a second. It's calculated by multiplying the interface width by the speed of its memory. In the case of DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.