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GeForce GT 640 DDR3 vs GeForce GTX 750

Intro

The GeForce GT 640 DDR3 comes with a GPU core clock speed of 900 MHz, and the 2048 MB of DDR3 RAM runs at 1782 MHz through a 128-bit bus. It also is comprised of 384 SPUs, 32 Texture Address Units, and 16 Raster Operation Units.

Compare those specs to the GeForce GTX 750, which features a GPU core clock speed of 1020 MHz, and 1024 MB of GDDR5 RAM set to run at 1250 MHz through a 128-bit bus. It also features 512 SPUs, 32 TAUs, and 16 ROPs.

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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

Performance-wise, the GeForce GTX 750 should in theory 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 (approximately 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 should be a bit (approximately 13%) more effective at anti-aliasing than the GeForce GT 640 DDR3, and will be capable of handling higher resolutions without losing too much performance. (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

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GeForce GT 640 DDR3

Amazon.com

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GeForce GTX 750

Amazon.com

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Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

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Model GeForce GT 640 DDR3 GeForce GTX 750
Manufacturer nVidia nVidia
Year June 2012 February 2014
Code Name GK107 GM107
Memory 2048 MB 1024 MB
Core Speed 900 MHz 1020 MHz
Memory Speed 3564 MHz 5000 MHz
Power (Max TDP) 65 watts 55 watts
Bandwidth 57024 MB/sec 80000 MB/sec
Texel Rate 28800 Mtexels/sec 32640 Mtexels/sec
Pixel Rate 14400 Mpixels/sec 16320 Mpixels/sec
Unified Shaders 384 512
Texture Mapping Units 32 32
Render Output Units 16 16
Bus Type DDR3 GDDR5
Bus Width 128-bit 128-bit
Fab Process 28 nm 28 nm
Transistors 1300 million 1870 million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.0 DirectX 11.0
OpenGL Version OpenGL 4.2 OpenGL 4.4

Memory Bandwidth: Bandwidth is the maximum amount of data (in units of MB per second) that can be transferred past the external memory interface in one second. It is calculated by multiplying the interface width by the speed of its memory. If the card has DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This figure is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The higher this number, 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 maximum number of pixels that the graphics card can possibly write to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

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GeForce GT 640 DDR3

Amazon.com

Check prices at:

GeForce GTX 750

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

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