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GeForce GT 640 DDR3 vs GeForce GTX 260

Intro

The GeForce GT 640 DDR3 features a core clock speed of 900 MHz and a DDR3 memory speed of 1782 MHz. It also features a 128-bit bus, and uses a 28 nm design. It is made up of 384 SPUs, 32 TAUs, and 16 ROPs.

Compare all of that to the GeForce GTX 260, which features a clock speed of 576 MHz and a GDDR3 memory speed of 999 MHz. It also uses a 448-bit bus, and makes use of a 65 nm design. It features 192 SPUs, 64 TAUs, and 28 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3 65 Watts
GeForce GTX 260 182 Watts
Difference: 117 Watts (180%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 260 should be much faster than the GeForce GT 640 DDR3 in general. (explain)

GeForce GTX 260 111888 MB/sec
GeForce GT 640 DDR3 57024 MB/sec
Difference: 54864 (96%)

Texel Rate

The GeForce GTX 260 should be quite a bit (about 28%) more effective at AF than the GeForce GT 640 DDR3. (explain)

GeForce GTX 260 36864 Mtexels/sec
GeForce GT 640 DDR3 28800 Mtexels/sec
Difference: 8064 (28%)

Pixel Rate

The GeForce GTX 260 will be a little bit (about 12%) more effective at full screen anti-aliasing than the GeForce GT 640 DDR3, and should be capable of handling higher resolutions without losing too much performance. (explain)

GeForce GTX 260 16128 Mpixels/sec
GeForce GT 640 DDR3 14400 Mpixels/sec
Difference: 1728 (12%)

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

GeForce GTX 260

Amazon.com

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 260
Manufacturer nVidia nVidia
Year June 2012 June 16, 2008
Code Name GK107 G200
Memory 2048 MB 896 MB
Core Speed 900 MHz 576 MHz
Memory Speed 3564 MHz 1998 MHz
Power (Max TDP) 65 watts 182 watts
Bandwidth 57024 MB/sec 111888 MB/sec
Texel Rate 28800 Mtexels/sec 36864 Mtexels/sec
Pixel Rate 14400 Mpixels/sec 16128 Mpixels/sec
Unified Shaders 384 192
Texture Mapping Units 32 64
Render Output Units 16 28
Bus Type DDR3 GDDR3
Bus Width 128-bit 448-bit
Fab Process 28 nm 65 nm
Transistors 1300 million 1400 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: Bandwidth is the largest amount of data (in units of megabytes per second) that can be transported across the external memory interface in one second. It's worked out by multiplying the bus width by the speed of its memory. If it uses DDR RAM, it should be multiplied by 2 once 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 texture map elements (texels) that are applied per second. This number is calculated by multiplying the total amount of texture units by the core speed of the chip. The better this number, the better the graphics card will be at 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 write to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.

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