GeForce GT 640 DDR3 vs GeForce GTX 750

Intro

Compare that to the GeForce GTX 750, which uses a 28 nm design. nVidia has clocked the core speed at 1020 MHz. The GDDR5 RAM works at a frequency of 1250 MHz on this particular model. It features 512 SPUs along with 32 Texture Address Units and 16 Rasterization Operator Units.

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		3958 points
GeForce GT 640 DDR3		1560 points
	Difference: 2398 (154%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 750		55 Watts
GeForce GT 640 DDR3		65 Watts
	Difference: 10 Watts (18%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 750 should theoretically be a lot better than the GeForce GT 640 DDR3 in general. (explain)

GeForce GTX 750		80000 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 22976 (40%)

Texel Rate

The GeForce GTX 750 will be just a bit (about 13%) more effective at AF than the GeForce GT 640 DDR3. (explain)

GeForce GTX 750		32640 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 3840 (13%)

Pixel Rate

The GeForce GTX 750 will be a small bit (about 13%) better at FSAA than the GeForce GT 640 DDR3, and also will be capable of handling higher resolutions more effectively. (explain)

GeForce GTX 750		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 max amount of information (in units of MB per second) that can be transported over the external memory interface in a second. It's worked out by multiplying the bus width by its memory speed. In the case of DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed in one second. This figure 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 number of pixels the video card could possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.