GeForce GT 640 DDR3 vs GeForce GTX 560

Intro

Compare those specs to the GeForce GTX 560, which features clock speeds of 810 MHz on the GPU, and 1001 MHz on the 1024 MB of GDDR5 RAM. It features 336 SPUs as well as 56 TAUs and 32 ROPs.

Display Graphs

Hide Graphs

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

As far as performance goes, the GeForce GTX 560 should in theory be a lot better than the GeForce GT 640 DDR3 overall. (explain)

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

Texel Rate

The GeForce GTX 560 will be a lot (approximately 58%) faster with regards to texture 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 using 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 max amount of data (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 its memory speed. If it uses DDR type memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel 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 reach the max fill rate.