Radeon HD 3870 512MB vs Radeon HD 6750

Intro

Compare those specs to the Radeon HD 6750, which features a clock frequency of 725 MHz and a GDDR5 memory speed of 1000 MHz. It also makes use of a 128-bit memory bus, and makes use of a 40 nm design. It features 720 SPUs, 36 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6750		86 Watts
Radeon HD 3870 512MB		106 Watts
	Difference: 20 Watts (23%)

Memory Bandwidth

The Radeon HD 6750 should in theory be a little bit faster than the Radeon HD 3870 512MB overall. (explain)

Radeon HD 6750		64000 MB/sec
Radeon HD 3870 512MB		57600 MB/sec
	Difference: 6400 (11%)

Texel Rate

The Radeon HD 6750 should be quite a bit (more or less 110%) faster with regards to anisotropic filtering than the Radeon HD 3870 512MB. (explain)

Radeon HD 6750		26100 Mtexels/sec
Radeon HD 3870 512MB		12400 Mtexels/sec
	Difference: 13700 (110%)

Pixel Rate

The Radeon HD 3870 512MB is a bit (more or less 7%) faster with regards to anti-aliasing than the Radeon HD 6750, and should be able to handle higher resolutions more effectively. (explain)

Radeon HD 3870 512MB		12400 Mpixels/sec
Radeon HD 6750		11600 Mpixels/sec
	Difference: 800 (7%)

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 maximum amount of information (in units of megabytes per second) that can be moved past the external memory interface in a second. It's worked out by multiplying the card's interface width by its memory clock speed. If the card has DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster 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 applied in one second. This number is worked out by multiplying the total texture units by the core speed of the chip. The better the texel rate, the better the graphics card will be at 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 could possibly record to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.