GeForce GT 640 DDR3 vs GeForce GTX 860M

Intro

Compare those specs to the GeForce GTX 860M, which has GPU clock speed of 797 MHz, and 4096 MB of GDDR5 memory running at 1000 MHz through a 128-bit bus. It also is made up of 1152 SPUs, 96 Texture Address Units, and 16 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 860M		4340 points
GeForce GT 640 DDR3		1560 points
	Difference: 2780 (178%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 860M		45 Watts
GeForce GT 640 DDR3		65 Watts
	Difference: 20 Watts (44%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 860M should theoretically be just a bit superior to the GeForce GT 640 DDR3 overall. (explain)

GeForce GTX 860M		64000 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 6976 (12%)

Texel Rate

The GeForce GTX 860M will be much (more or less 166%) more effective at texture filtering than the GeForce GT 640 DDR3. (explain)

GeForce GTX 860M		76512 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 47712 (166%)

Pixel Rate

If running with a high resolution is important to you, then the GeForce GT 640 DDR3 is the winner, but only just. (explain)

GeForce GT 640 DDR3		14400 Mpixels/sec
GeForce GTX 860M		12752 Mpixels/sec
	Difference: 1648 (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 information (counted in megabytes per second) that can be transported across the external memory interface within a second. The number is calculated by multiplying the card's interface width by the speed of its memory. If the card has DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied per second. This figure is calculated by multiplying the total texture units of the card by the core speed of the chip. The higher the texel rate, the better the video 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 number of pixels the video card can possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the the card's clock speed. 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 is also dependant on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.