Radeon HD 5570 vs Radeon HD 6770

Intro

Compare those specifications to the Radeon HD 6770, which has a core clock frequency of 900 MHz and a GDDR5 memory speed of 1050 MHz. It also features a 128-bit bus, and uses a 40 nm design. It is made up of 800 SPUs, 40 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5570		43 Watts
Radeon HD 6770		108 Watts
	Difference: 65 Watts (151%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6770 will be 133% quicker than the Radeon HD 5570 in general, because of its greater data rate. (explain)

Radeon HD 6770		67200 MB/sec
Radeon HD 5570		28800 MB/sec
	Difference: 38400 (133%)

Texel Rate

The Radeon HD 6770 is a lot (more or less 177%) better at AF than the Radeon HD 5570. (explain)

Radeon HD 6770		36000 Mtexels/sec
Radeon HD 5570		13000 Mtexels/sec
	Difference: 23000 (177%)

Pixel Rate

The Radeon HD 6770 will be quite a bit (approximately 177%) better at FSAA than the Radeon HD 5570, and should be capable of handling higher resolutions without slowing down too much. (explain)

Radeon HD 6770		14400 Mpixels/sec
Radeon HD 5570		5200 Mpixels/sec
	Difference: 9200 (177%)

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 max amount of data (in units of megabytes per second) that can be transported past the external memory interface within a second. It is worked out by multiplying the interface width by its memory clock speed. In the case of DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly write to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. 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.