Radeon HD 5750 512MB vs Radeon HD 5770

Intro

Compare all that to the Radeon HD 5770, which comes with core speeds of 850 MHz on the GPU, and 1200 MHz on the 1024 MB of GDDR5 memory. It features 800(160x5) SPUs along with 40 TAUs and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5750 512MB		86 Watts
Radeon HD 5770		108 Watts
	Difference: 22 Watts (26%)

Memory Bandwidth

In theory, the Radeon HD 5770 should be just a bit faster than the Radeon HD 5750 512MB in general. (explain)

Radeon HD 5770		76800 MB/sec
Radeon HD 5750 512MB		73600 MB/sec
	Difference: 3200 (4%)

Texel Rate

The Radeon HD 5770 will be much (about 35%) more effective at AF than the Radeon HD 5750 512MB. (explain)

Radeon HD 5770		34000 Mtexels/sec
Radeon HD 5750 512MB		25200 Mtexels/sec
	Difference: 8800 (35%)

Pixel Rate

The Radeon HD 5770 will be much (about 21%) more effective at full screen anti-aliasing than the Radeon HD 5750 512MB, and should be able to handle higher screen resolutions while still performing well. (explain)

Radeon HD 5770		13600 Mpixels/sec
Radeon HD 5750 512MB		11200 Mpixels/sec
	Difference: 2400 (21%)

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 transported over the external memory interface in one second. The number is calculated by multiplying the card's interface width by the speed of its memory. If it uses DDR type memory, it should be multiplied by 2 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 AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This is calculated 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 graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). 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 maximum fill rate.