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GeForce GT 640 DDR3 vs GeForce GTS 250 1GB

Intro

The GeForce GT 640 DDR3 has 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 ROPs.

Compare those specifications to the GeForce GTS 250 1GB, which makes use of a 65/55 nm design. nVidia has set the core frequency at 738 MHz. The GDDR3 memory is set to run at a speed of 1100 MHz on this specific card. It features 128 SPUs along with 64 TAUs and 16 ROPs.

Display Graphs

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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, the GeForce GTS 250 1GB should perform a lot faster than the GeForce GT 640 DDR3 overall. (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 should be much (more or less 64%) more effective at texture 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

If running with high levels of AA is important to you, then the GeForce GT 640 DDR3 is superior to the GeForce GTS 250 1GB, by a large margin. (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

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.

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 data (in units of megabytes per second) that can be moved over the external memory interface within a second. The number is calculated by multiplying the card's bus width by its memory speed. If it uses DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed in one second. This figure is worked out 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 card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the the core speed of the card. 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 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 reach the max fill rate.

Display Prices

Hide Prices

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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