GeForce GT 640 DDR3 vs GeForce GTX 560 Ti

Intro

Compare those specifications to the GeForce GTX 560 Ti, which has GPU clock speed of 822 MHz, and 1024 MB of GDDR5 memory running at 1002 MHz through a 256-bit bus. It also is made up of 384 SPUs, 64 TAUs, 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

The GeForce GTX 560 Ti, in theory, should perform quite a bit faster than the GeForce GT 640 DDR3 overall. (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 will be a lot (more or less 83%) better at 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 is much (about 83%) more effective at full screen anti-aliasing than the GeForce GT 640 DDR3, and will be able to handle higher screen resolutions more effectively. (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 max amount of data (measured in megabytes per second) that can be moved across the external memory interface within a second. The number is worked out by multiplying the bus width by its memory clock speed. If it uses DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one second. This figure is calculated by multiplying the total texture units by the core clock speed of the chip. The higher the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.