GeForce GTX 660 vs Radeon HD 6750

Intro

Compare all that to the Radeon HD 6750, which comes with a clock speed of 725 MHz and a GDDR5 memory frequency of 1000 MHz. It also makes use of a 128-bit 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
GeForce GTX 660		140 Watts
	Difference: 54 Watts (63%)

Memory Bandwidth

In theory, the GeForce GTX 660 will be 125% faster than the Radeon HD 6750 overall, because of its higher data rate. (explain)

GeForce GTX 660		144192 MB/sec
Radeon HD 6750		64000 MB/sec
	Difference: 80192 (125%)

Texel Rate

The GeForce GTX 660 is a lot (about 200%) better at texture filtering than the Radeon HD 6750. (explain)

GeForce GTX 660		78400 Mtexels/sec
Radeon HD 6750		26100 Mtexels/sec
	Difference: 52300 (200%)

Pixel Rate

If using a high resolution is important to you, then the GeForce GTX 660 is the winner, by a large margin. (explain)

GeForce GTX 660		23520 Mpixels/sec
Radeon HD 6750		11600 Mpixels/sec
	Difference: 11920 (103%)

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 largest amount of information (measured in MB per second) that can be moved over the external memory interface in one second. It is worked out by multiplying the interface width by its memory speed. If it uses DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the the core 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 fill rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.