Radeon HD 5750 512MB vs Radeon HD 5770

Intro

Compare all that to the Radeon HD 5770, which uses a 40 nm design. AMD has clocked the core speed at 850 MHz. The GDDR5 memory is set to run at a frequency of 1200 MHz on this card. It features 800(160x5) SPUs as well as 40 Texture Address Units 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

Performance-wise, the Radeon HD 5770 should in theory be a little bit better than the Radeon HD 5750 512MB overall. (explain)

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

Texel Rate

The Radeon HD 5770 should be quite a bit (approximately 35%) faster with regards to anisotropic filtering 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

If running with lots of anti-aliasing is important to you, then the Radeon HD 5770 is a better choice, by far. (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 data (measured in megabytes per second) that can be moved over the external memory interface in a second. It's calculated by multiplying the card's bus width by its memory speed. If the card has DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better 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 number of texture map elements (texels) that are processed in one second. This number is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The better the texel rate, the better the graphics card will be at handling 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 graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.