GeForce GT 640 DDR3 vs GeForce GTX 560

Intro

Compare those specifications to the GeForce GTX 560, which has a clock frequency of 810 MHz and a GDDR5 memory frequency of 1001 MHz. It also uses a 256-bit memory bus, and makes use of a 40 nm design. It is made up of 336 SPUs, 56 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		3030 points
GeForce GT 640 DDR3		1560 points
	Difference: 1470 (94%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3		65 Watts
GeForce GTX 560		150 Watts
	Difference: 85 Watts (131%)

Memory Bandwidth

In theory, the GeForce GTX 560 should be 125% faster than the GeForce GT 640 DDR3 in general, because of its greater bandwidth. (explain)

GeForce GTX 560		128128 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 71104 (125%)

Texel Rate

The GeForce GTX 560 should be quite a bit (about 58%) better at anisotropic filtering than the GeForce GT 640 DDR3. (explain)

GeForce GTX 560		45360 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 16560 (58%)

Pixel Rate

If running with a high screen resolution is important to you, then the GeForce GTX 560 is superior to the GeForce GT 640 DDR3, by far. (explain)

GeForce GTX 560		25920 Mpixels/sec
GeForce GT 640 DDR3		14400 Mpixels/sec
	Difference: 11520 (80%)

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 (counted in MB per second) that can be transferred past 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 memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, 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 per second. This figure is worked out by multiplying the total amount of 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 per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly write to the local memory in a second - measured in millions of pixels per second. The figure is calculated 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 outputting the pixels (image) to the screen. The actual pixel fill rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.