Radeon HD 5750 1GB vs Radeon HD 7870

Intro

Compare all of that to the Radeon HD 7870, which features a core clock speed of 1000 MHz and a GDDR5 memory speed of 1200 MHz. It also uses a 256-bit bus, and uses a 28 nm design. It is comprised of 1280 SPUs, 80 Texture Address Units, 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

The Radeon HD 7870, in theory, should be quite a bit faster than the Radeon HD 5750 1GB overall. (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 texture 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

If using high levels of AA is important to you, then the Radeon HD 7870 is the winner, and very much so. (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: Memory bandwidth is the maximum amount of information (measured in megabytes per second) that can be transported past the external memory interface in one second. It's worked out by multiplying the card's interface width by its memory speed. If it uses DDR memory, it 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 anti-aliasing, 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 worked out by multiplying the total number of texture units of the card 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 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 clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.