GeForce GT 640 DDR3 vs GeForce GTX 460

Intro

Compare those specs to the GeForce GTX 460, which features clock speeds of 675 MHz on the GPU, and 900 MHz on the 768 MB of GDDR5 RAM. It features 336 SPUs as well as 56 TAUs and 24 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 460		2557 points
GeForce GT 640 DDR3		1560 points
	Difference: 997 (64%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3		65 Watts
GeForce GTX 460		150 Watts
	Difference: 85 Watts (131%)

Memory Bandwidth

Performance-wise, the GeForce GTX 460 should theoretically be a lot superior to the GeForce GT 640 DDR3 in general. (explain)

GeForce GTX 460		86400 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 29376 (52%)

Texel Rate

The GeForce GTX 460 should be a lot (about 31%) more effective at anisotropic filtering than the GeForce GT 640 DDR3. (explain)

GeForce GTX 460		37800 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 9000 (31%)

Pixel Rate

If using a high screen resolution is important to you, then the GeForce GTX 460 is the winner, though only just barely. (explain)

GeForce GTX 460		16200 Mpixels/sec
GeForce GT 640 DDR3		14400 Mpixels/sec
	Difference: 1800 (13%)

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: Memory bandwidth is the max amount of data (counted in megabytes per second) that can be moved across the external memory interface in a second. It is calculated by multiplying the card's bus width by its memory speed. If the card has DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher 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 are applied in one second. This is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The higher this number, the better the video 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 number of pixels that the graphics card could possibly record to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes 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, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.