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GeForce GT 640 DDR3 vs GeForce GTS 250 1GB

Intro

The GeForce GT 640 DDR3 makes use of a 28 nm design. nVidia has clocked the core frequency at 900 MHz. The DDR3 RAM runs at a frequency of 1782 MHz on this particular card. It features 384 SPUs as well as 32 TAUs and 16 Rasterization Operator Units.

Compare those specifications to the GeForce GTS 250 1GB, which has a GPU core clock speed of 738 MHz, and 1024 MB of GDDR3 RAM set to run at 1100 MHz through a 256-bit bus. It also features 128 SPUs, 64 TAUs, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3 65 Watts
GeForce GTS 250 1GB 145 Watts
Difference: 80 Watts (123%)

Memory Bandwidth

Theoretically speaking, the GeForce GTS 250 1GB will be 23% quicker than the GeForce GT 640 DDR3 in general, due to its greater bandwidth. (explain)

GeForce GTS 250 1GB 70400 MB/sec
GeForce GT 640 DDR3 57024 MB/sec
Difference: 13376 (23%)

Texel Rate

The GeForce GTS 250 1GB is a lot (more or less 64%) better at anisotropic filtering than the GeForce GT 640 DDR3. (explain)

GeForce GTS 250 1GB 47232 Mtexels/sec
GeForce GT 640 DDR3 28800 Mtexels/sec
Difference: 18432 (64%)

Pixel Rate

The GeForce GT 640 DDR3 will be quite a bit (about 22%) better at anti-aliasing than the GeForce GTS 250 1GB, and should be able to handle higher resolutions more effectively. (explain)

GeForce GT 640 DDR3 14400 Mpixels/sec
GeForce GTS 250 1GB 11808 Mpixels/sec
Difference: 2592 (22%)

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 GTS 250 1GB

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 GTS 250 1GB
Manufacturer nVidia nVidia
Year June 2012 March 3, 2009
Code Name GK107 G92a/b
Memory 2048 MB 1024 MB
Core Speed 900 MHz 738 MHz
Memory Speed 3564 MHz 2200 MHz
Power (Max TDP) 65 watts 145 watts
Bandwidth 57024 MB/sec 70400 MB/sec
Texel Rate 28800 Mtexels/sec 47232 Mtexels/sec
Pixel Rate 14400 Mpixels/sec 11808 Mpixels/sec
Unified Shaders 384 128
Texture Mapping Units 32 64
Render Output Units 16 16
Bus Type DDR3 GDDR3
Bus Width 128-bit 256-bit
Fab Process 28 nm 65/55 nm
Transistors 1300 million 754 million
Bus PCIe 3.0 x16 PCIe x16 2.0
DirectX Version DirectX 11.0 DirectX 10
OpenGL Version OpenGL 4.2 OpenGL 3.1

Memory Bandwidth: Memory bandwidth is the max amount of information (measured in megabytes per second) that can be transported across the external memory interface within a second. It is calculated by multiplying the interface width by the speed of its memory. If it uses DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. 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 number of texture map elements (texels) that can be applied in one second. This number is worked out by multiplying the total number of texture units by the core speed of the chip. The higher this number, the better the video 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 amount of pixels the video card can possibly write to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

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GeForce GT 640 DDR3

Amazon.com

Check prices at:

GeForce GTS 250 1GB

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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