GeForce GT 640 DDR3 vs GeForce GTX Titan X

Intro

Compare those specs to the GeForce GTX Titan X, which features GPU core speed of 1000 MHz, and 12288 MB of GDDR5 memory set to run at 1750 MHz through a 384-bit bus. It also features 3072 Stream Processors, 192 TAUs, and 96 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 Titan X		17879 points
GeForce GT 640 DDR3		1560 points
	Difference: 16319 (1046%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3		65 Watts
GeForce GTX Titan X		250 Watts
	Difference: 185 Watts (285%)

Memory Bandwidth

As far as performance goes, the GeForce GTX Titan X should theoretically be a lot better than the GeForce GT 640 DDR3 in general. (explain)

GeForce GTX Titan X		336000 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 278976 (489%)

Texel Rate

The GeForce GTX Titan X will be a lot (about 567%) better at anisotropic filtering than the GeForce GT 640 DDR3. (explain)

GeForce GTX Titan X		192000 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 163200 (567%)

Pixel Rate

The GeForce GTX Titan X will be quite a bit (more or less 567%) better at FSAA than the GeForce GT 640 DDR3, and will be capable of handling higher resolutions without slowing down too much. (explain)

GeForce GTX Titan X		96000 Mpixels/sec
GeForce GT 640 DDR3		14400 Mpixels/sec
	Difference: 81600 (567%)

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 largest amount of information (in units of megabytes per second) that can be transferred past the external memory interface in one second. The number is worked out by multiplying the bus width by the speed of its memory. In the case of DDR memory, it should 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 number of texture map elements (texels) that can be processed in one second. This number is calculated by multiplying the total number of texture units by the core clock 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 amount of pixels that the graphics chip could possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.