GeForce GT 640 DDR3 vs GeForce GTX 750

Intro

Compare that to the GeForce GTX 750, which uses a 28 nm design. nVidia has set the core speed at 1020 MHz. The GDDR5 RAM runs at a speed of 1250 MHz on this model. It features 512 SPUs as well as 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 in theory be quite a bit superior to 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%) better at texture filtering 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

If using high levels of AA is important to you, then the GeForce GTX 750 is superior to the GeForce GT 640 DDR3, but not by far. (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: Memory bandwidth is the max amount of information (measured in MB per second) that can be transported over the external memory interface in a second. It's calculated by multiplying the card's interface width by its memory clock speed. If the card has DDR RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This number is worked out by multiplying the total texture units by the core clock speed of the chip. The higher the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.