GeForce GT 640 DDR3 vs GeForce GTX 560 Ti

Intro

Compare all of that to the GeForce GTX 560 Ti, which comes with a core clock frequency of 822 MHz and a GDDR5 memory speed of 1002 MHz. It also uses a 256-bit memory bus, and makes use of a 40 nm design. It is comprised of 384 SPUs, 64 Texture Address Units, and 32 ROPs.

Display Graphs

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

GeForce GTX 560 Ti		3466 points
GeForce GT 640 DDR3		1560 points
	Difference: 1906 (122%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3		65 Watts
GeForce GTX 560 Ti		170 Watts
	Difference: 105 Watts (162%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 560 Ti is 125% faster than the GeForce GT 640 DDR3 in general, because of its greater data rate. (explain)

GeForce GTX 560 Ti		128256 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 71232 (125%)

Texel Rate

The GeForce GTX 560 Ti is much (more or less 83%) faster with regards to texture filtering than the GeForce GT 640 DDR3. (explain)

GeForce GTX 560 Ti		52608 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 23808 (83%)

Pixel Rate

The GeForce GTX 560 Ti will be quite a bit (approximately 83%) faster with regards to FSAA than the GeForce GT 640 DDR3, and also should be able to handle higher resolutions without slowing down too much. (explain)

GeForce GTX 560 Ti		26304 Mpixels/sec
GeForce GT 640 DDR3		14400 Mpixels/sec
	Difference: 11904 (83%)

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 data (counted in megabytes per second) that can be moved over the external memory interface in one second. The number is worked out by multiplying the card's interface width by the speed of its memory. If the card has DDR type RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, 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 applied in one second. This number is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The higher this number, the better the graphics 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 its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.