GeForce GTX 660 vs Radeon HD 6750 1GB

Intro

Compare those specs to the Radeon HD 6750 1GB, which comes with a clock speed of 725 MHz and a GDDR5 memory frequency of 1000 MHz. It also uses a 128-bit memory bus, and uses a 40 nm design. It is made up of 720 SPUs, 36 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6750 1GB		86 Watts
GeForce GTX 660		140 Watts
	Difference: 54 Watts (63%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 660 should theoretically be quite a bit better than the Radeon HD 6750 1GB in general. (explain)

GeForce GTX 660		144192 MB/sec
Radeon HD 6750 1GB		64000 MB/sec
	Difference: 80192 (125%)

Texel Rate

The GeForce GTX 660 will be a lot (about 200%) more effective at texture filtering than the Radeon HD 6750 1GB. (explain)

GeForce GTX 660		78400 Mtexels/sec
Radeon HD 6750 1GB		26100 Mtexels/sec
	Difference: 52300 (200%)

Pixel Rate

If running with a high screen 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 1GB		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: Memory bandwidth is the maximum amount of data (counted in megabytes per second) that can be moved past the external memory interface in one second. It is calculated by multiplying the interface width by its memory speed. If the card has DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied in one second. This is calculated by multiplying the total amount of texture units by the core speed of the chip. The better this number, the better the 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 number of pixels the video card could possibly record to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.