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GeForce GT 310 vs GeForce GT 640 DDR3

Intro

The GeForce GT 310 features a core clock frequency of 589 MHz and a DDR2 memory speed of 1000 MHz. It also makes use of a 64-bit bus, and makes use of a 40 nm design. It is comprised of 16 SPUs, 8 Texture Address Units, and 4 Raster Operation Units.

Compare all that to the GeForce GT 640 DDR3, which has a GPU core clock speed of 900 MHz, and 2048 MB of DDR3 memory set to run at 1782 MHz through a 128-bit bus. It also features 384 SPUs, 32 TAUs, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 310 31 Watts
GeForce GT 640 DDR3 65 Watts
Difference: 34 Watts (110%)

Memory Bandwidth

Theoretically speaking, the GeForce GT 640 DDR3 should be quite a bit faster than the GeForce GT 310 overall. (explain)

GeForce GT 640 DDR3 57024 MB/sec
GeForce GT 310 16000 MB/sec
Difference: 41024 (256%)

Texel Rate

The GeForce GT 640 DDR3 will be much (about 511%) faster with regards to texture filtering than the GeForce GT 310. (explain)

GeForce GT 640 DDR3 28800 Mtexels/sec
GeForce GT 310 4712 Mtexels/sec
Difference: 24088 (511%)

Pixel Rate

If running with high levels of AA is important to you, then the GeForce GT 640 DDR3 is the winner, and very much so. (explain)

GeForce GT 640 DDR3 14400 Mpixels/sec
GeForce GT 310 2356 Mpixels/sec
Difference: 12044 (511%)

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 310

Amazon.com

Check prices at:

GeForce GT 640 DDR3

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 310 GeForce GT 640 DDR3
Manufacturer nVidia nVidia
Year November 2009 June 2012
Code Name GT218 GK107
Memory 512 MB 2048 MB
Core Speed 589 MHz 900 MHz
Memory Speed 2000 MHz 3564 MHz
Power (Max TDP) 31 watts 65 watts
Bandwidth 16000 MB/sec 57024 MB/sec
Texel Rate 4712 Mtexels/sec 28800 Mtexels/sec
Pixel Rate 2356 Mpixels/sec 14400 Mpixels/sec
Unified Shaders 16 384
Texture Mapping Units 8 32
Render Output Units 4 16
Bus Type DDR2 DDR3
Bus Width 64-bit 128-bit
Fab Process 40 nm 28 nm
Transistors 260 million 1300 million
Bus PCIe 2.0 PCIe 3.0 x16
DirectX Version DirectX 10.1 DirectX 11.0
OpenGL Version OpenGL 3.1 OpenGL 4.2

Memory Bandwidth: Memory bandwidth is the max amount of information (measured in megabytes per second) that can be transported over the external memory interface within a second. The number is worked out by multiplying the card's bus width by its memory clock speed. If it uses DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly write to the local memory per 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 - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

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GeForce GT 310

Amazon.com

Check prices at:

GeForce GT 640 DDR3

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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