Radeon HD 5750 512MB vs Radeon HD 7870 XT

Intro

Compare those specs to the Radeon HD 7870 XT, which features GPU clock speed of 925 MHz, and 2048 MB of GDDR5 memory set to run at 1500 MHz through a 256-bit bus. It also is comprised of 1536 Stream Processors, 96 TAUs, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5750 512MB		86 Watts
Radeon HD 7870 XT		185 Watts
	Difference: 99 Watts (115%)

Memory Bandwidth

Performance-wise, the Radeon HD 7870 XT should theoretically be much superior to the Radeon HD 5750 512MB overall. (explain)

Radeon HD 7870 XT		192000 MB/sec
Radeon HD 5750 512MB		73600 MB/sec
	Difference: 118400 (161%)

Texel Rate

The Radeon HD 7870 XT is quite a bit (more or less 252%) better at anisotropic filtering than the Radeon HD 5750 512MB. (explain)

Radeon HD 7870 XT		88800 Mtexels/sec
Radeon HD 5750 512MB		25200 Mtexels/sec
	Difference: 63600 (252%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 7870 XT is superior to the Radeon HD 5750 512MB, by a large margin. (explain)

Radeon HD 7870 XT		29600 Mpixels/sec
Radeon HD 5750 512MB		11200 Mpixels/sec
	Difference: 18400 (164%)

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 maximum amount of data (in units of megabytes per second) that can be transferred across the external memory interface within a second. The number is calculated by multiplying the card's interface width by its memory speed. If it uses DDR type RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of colour 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 output rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.