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GeForce GT 640 DDR3 vs GeForce GTS 250 1GB

Intro

The GeForce GT 640 DDR3 has a core clock frequency of 900 MHz and a DDR3 memory speed of 1782 MHz. It also makes use of a 128-bit bus, and makes use of a 28 nm design. It is made up of 384 SPUs, 32 Texture Address Units, and 16 ROPs.

Compare that to the GeForce GTS 250 1GB, which features GPU core speed of 738 MHz, and 1024 MB of GDDR3 memory running at 1100 MHz through a 256-bit bus. It also is made up of 128 Stream Processors, 64 Texture Address Units, and 16 Raster Operation Units.

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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 should be much 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 will be much (more or less 64%) more effective 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 (approximately 22%) faster with regards to full screen anti-aliasing than the GeForce GTS 250 1GB, and also will be capable of handling higher screen 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

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 maximum amount of information (counted in megabytes per second) that can be transferred across the external memory interface in a second. It is calculated by multiplying the interface width by its memory speed. If it uses DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on lots of other factors, most notably the memory bandwidth - the lower the 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 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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