Radeon HD 5750 1GB vs Radeon HD 6770 1GB

Intro

Compare all of that to the Radeon HD 6770 1GB, which has a core clock speed of 900 MHz and a GDDR5 memory frequency of 1050 MHz. It also uses a 128-bit bus, and makes use of a 40 nm design. It is comprised of 800 SPUs, 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 1GB		86 Watts
Radeon HD 6770 1GB		108 Watts
	Difference: 22 Watts (26%)

Memory Bandwidth

Performance-wise, the Radeon HD 5750 1GB should theoretically be just a bit better than the Radeon HD 6770 1GB overall. (explain)

Radeon HD 5750 1GB		73600 MB/sec
Radeon HD 6770 1GB		67200 MB/sec
	Difference: 6400 (10%)

Texel Rate

The Radeon HD 6770 1GB should be quite a bit (about 43%) faster with regards to anisotropic filtering than the Radeon HD 5750 1GB. (explain)

Radeon HD 6770 1GB		36000 Mtexels/sec
Radeon HD 5750 1GB		25200 Mtexels/sec
	Difference: 10800 (43%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 6770 1GB is a better choice, and very much so. (explain)

Radeon HD 6770 1GB		14400 Mpixels/sec
Radeon HD 5750 1GB		11200 Mpixels/sec
	Difference: 3200 (29%)

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 (counted in megabytes per second) that can be transferred over the external memory interface in one second. It is worked out by multiplying the bus width by its memory clock speed. In the case of DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, 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 number 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 higher the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.