Radeon HD 5750 1GB vs Radeon HD 5770

Intro

Compare that to the Radeon HD 5770, which has a core clock speed of 850 MHz and a GDDR5 memory frequency of 1200 MHz. It also features a 128-bit bus, and uses a 40 nm design. It is made up of 800(160x5) SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5750 1GB		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 1GB overall. (explain)

Radeon HD 5770		76800 MB/sec
Radeon HD 5750 1GB		73600 MB/sec
	Difference: 3200 (4%)

Texel Rate

The Radeon HD 5770 should be much (about 35%) faster with regards to AF than the Radeon HD 5750 1GB. (explain)

Radeon HD 5770		34000 Mtexels/sec
Radeon HD 5750 1GB		25200 Mtexels/sec
	Difference: 8800 (35%)

Pixel Rate

The Radeon HD 5770 will be quite a bit (about 21%) faster with regards to FSAA than the Radeon HD 5750 1GB, and also should be able to handle higher screen resolutions without slowing down too much. (explain)

Radeon HD 5770		13600 Mpixels/sec
Radeon HD 5750 1GB		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: Memory bandwidth is the max amount of information (in units of MB per second) that can be moved across the external memory interface within a second. It is calculated by multiplying the bus width by its memory speed. In the case of DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This figure is calculated by multiplying the total number of texture units by the core clock speed of the chip. The better this number, the better the video 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 that the graphics chip can possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.