GeForce GT 640 DDR3 vs GeForce GTX 750 Ti

Intro

Compare all that to the GeForce GTX 750 Ti, which comes with a GPU core clock speed of 1020 MHz, and 2048 MB of GDDR5 RAM running at 1350 MHz through a 128-bit bus. It also features 640 SPUs, 40 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 750 Ti		4562 points
GeForce GT 640 DDR3		1560 points
	Difference: 3002 (192%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 750 Ti		60 Watts
GeForce GT 640 DDR3		65 Watts
	Difference: 5 Watts (8%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 750 Ti should in theory be much better than the GeForce GT 640 DDR3 in general. (explain)

GeForce GTX 750 Ti		86400 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 29376 (52%)

Texel Rate

The GeForce GTX 750 Ti should be much (about 42%) more effective at AF than the GeForce GT 640 DDR3. (explain)

GeForce GTX 750 Ti		40800 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 12000 (42%)

Pixel Rate

The GeForce GTX 750 Ti will be a bit (more or less 13%) faster with regards to FSAA than the GeForce GT 640 DDR3, and will be able to handle higher resolutions more effectively. (explain)

GeForce GTX 750 Ti		16320 Mpixels/sec
GeForce GT 640 DDR3		14400 Mpixels/sec
	Difference: 1920 (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: Bandwidth is the largest amount of data (in units of MB per second) that can be moved past the external memory interface in one second. The number is calculated by multiplying the card's interface width by its memory speed. If it uses DDR type memory, the result should be multiplied by 2 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 AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed in one second. This is calculated by multiplying the total texture units by the core 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 in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.