GeForce GT 640 DDR3 vs GeForce GTX 750

Intro

Compare those specs to the GeForce GTX 750, which features a core clock frequency of 1020 MHz and a GDDR5 memory frequency of 1250 MHz. It also makes use of a 128-bit memory bus, and uses a 28 nm design. It is comprised of 512 SPUs, 32 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		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

The GeForce GTX 750, in theory, should be quite a bit faster 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 (approximately 13%) faster with regards to 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 bit (about 13%) more effective at FSAA than the GeForce GT 640 DDR3, and also will be capable of handling higher screen 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 maximum amount of data (measured in MB per second) that can be moved past the external memory interface in one second. The number is calculated by multiplying the bus width by its memory speed. In the case of DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This figure is calculated by multiplying the total number of texture units by the core clock speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics 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 ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.