Radeon HD 5870 vs Radeon HD 7750

Intro

Compare all that to the Radeon HD 7750, which comes with a clock speed of 800 MHz and a GDDR5 memory speed of 1125 MHz. It also features a 128-bit bus, and uses a 28 nm design. It features 512 SPUs, 32 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7750		55 Watts
Radeon HD 5870		188 Watts
	Difference: 133 Watts (242%)

Memory Bandwidth

Theoretically, the Radeon HD 5870 should be much faster than the Radeon HD 7750 overall. (explain)

Radeon HD 5870		153600 MB/sec
Radeon HD 7750		72000 MB/sec
	Difference: 81600 (113%)

Texel Rate

The Radeon HD 5870 should be a lot (about 166%) more effective at AF than the Radeon HD 7750. (explain)

Radeon HD 5870		68000 Mtexels/sec
Radeon HD 7750		25600 Mtexels/sec
	Difference: 42400 (166%)

Pixel Rate

The Radeon HD 5870 is much (more or less 113%) faster with regards to anti-aliasing than the Radeon HD 7750, and also will be capable of handling higher resolutions without losing too much performance. (explain)

Radeon HD 5870		27200 Mpixels/sec
Radeon HD 7750		12800 Mpixels/sec
	Difference: 14400 (113%)

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 largest amount of data (in units of megabytes per second) that can be transferred past the external memory interface within a second. It's calculated by multiplying the interface width by its memory clock speed. If it uses DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This figure is calculated by multiplying the total texture units by the core clock speed of the chip. The better the texel rate, the better the 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 maximum amount of pixels that the graphics chip can possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.