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GeForce GT 310 vs GeForce GT 640 DDR3

Intro

The GeForce GT 310 comes with core speeds of 589 MHz on the GPU, and 1000 MHz on the 512 MB of DDR2 RAM. It features 16 SPUs as well as 8 TAUs and 4 Rasterization Operator Units.

Compare those specifications to the GeForce GT 640 DDR3, which makes use of a 28 nm design. nVidia has clocked the core frequency at 900 MHz. The DDR3 memory runs at a speed of 1782 MHz on this card. It features 384 SPUs as well as 32 Texture Address Units and 16 Rasterization Operator 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

The GeForce GT 640 DDR3 should theoretically 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 should be quite a bit (more or less 511%) faster with regards to AF 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 using a high screen resolution is important to you, then the GeForce GT 640 DDR3 is superior to the GeForce GT 310, by far. (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

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GeForce GT 640 DDR3

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 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: Bandwidth is the largest amount of information (in units of MB per second) that can be moved past the external memory interface in a second. It is worked out by multiplying the interface width by its memory clock speed. If it uses DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

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