Radeon HD 5750 1GB vs Radeon HD 7870

Intro

Compare all of that to the Radeon HD 7870, which has a GPU core clock speed of 1000 MHz, and 2048 MB of GDDR5 memory running at 1200 MHz through a 256-bit bus. It also is comprised of 1280 Stream Processors, 80 TAUs, and 32 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 7870		175 Watts
	Difference: 89 Watts (103%)

Memory Bandwidth

Theoretically, the Radeon HD 7870 should perform quite a bit faster than the Radeon HD 5750 1GB in general. (explain)

Radeon HD 7870		153600 MB/sec
Radeon HD 5750 1GB		73600 MB/sec
	Difference: 80000 (109%)

Texel Rate

The Radeon HD 7870 is quite a bit (approximately 217%) faster with regards to anisotropic filtering than the Radeon HD 5750 1GB. (explain)

Radeon HD 7870		80000 Mtexels/sec
Radeon HD 5750 1GB		25200 Mtexels/sec
	Difference: 54800 (217%)

Pixel Rate

The Radeon HD 7870 will be a lot (more or less 186%) more effective at FSAA than the Radeon HD 5750 1GB, and capable of handling higher screen resolutions without slowing down too much. (explain)

Radeon HD 7870		32000 Mpixels/sec
Radeon HD 5750 1GB		11200 Mpixels/sec
	Difference: 20800 (186%)

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 information (measured in MB per second) that can be moved past the external memory interface in a second. It's calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR memory, it should be multiplied by 2 again. If 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 higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.