GeForce GT 640 DDR3 vs GeForce GTX 560 Ti 448

Intro

Compare those specs to the GeForce GTX 560 Ti 448, which makes use of a 40 nm design. nVidia has set the core frequency at 732 MHz. The GDDR5 memory runs at a frequency of 900 MHz on this particular card. It features 448 SPUs along with 56 Texture Address Units and 40 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 448		4200 points
GeForce GT 640 DDR3		1560 points
	Difference: 2640 (169%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3		65 Watts
GeForce GTX 560 Ti 448		210 Watts
	Difference: 145 Watts (223%)

Memory Bandwidth

Performance-wise, the GeForce GTX 560 Ti 448 should in theory be a lot better than the GeForce GT 640 DDR3 overall. (explain)

GeForce GTX 560 Ti 448		144000 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 86976 (153%)

Texel Rate

The GeForce GTX 560 Ti 448 should be much (more or less 42%) better at anisotropic filtering than the GeForce GT 640 DDR3. (explain)

GeForce GTX 560 Ti 448		40992 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 12192 (42%)

Pixel Rate

The GeForce GTX 560 Ti 448 is a lot (about 103%) better at full screen anti-aliasing than the GeForce GT 640 DDR3, and also will be capable of handling higher screen resolutions without slowing down too much. (explain)

GeForce GTX 560 Ti 448		29280 Mpixels/sec
GeForce GT 640 DDR3		14400 Mpixels/sec
	Difference: 14880 (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: Bandwidth is the maximum amount of information (measured in megabytes per second) that can be transported across the external memory interface within a second. It's calculated by multiplying the card's interface width by its memory clock speed. If the card has DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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