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GeForce 820M vs GeForce GT 310

Intro

The GeForce 820M comes with clock speeds of 719 MHz on the GPU, and 1000 MHz on the 2048 MB of DDR3 RAM. It features 96 SPUs as well as 16 Texture Address Units and 4 ROPs.

Compare those specs to the GeForce GT 310, which uses a 40 nm design. nVidia has set the core speed at 589 MHz. The DDR2 memory runs at a speed of 1000 MHz on this particular model. It features 16 SPUs as well as 8 TAUs and 4 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M 15 Watts
GeForce GT 310 31 Watts
Difference: 16 Watts (107%)

Memory Bandwidth

Both cards have exactly the same memory bandwidth, so theoretically they should perform exactly the same. (explain)

Texel Rate

The GeForce 820M will be much (about 144%) faster with regards to anisotropic filtering than the GeForce GT 310. (explain)

GeForce 820M 11504 Mtexels/sec
GeForce GT 310 4712 Mtexels/sec
Difference: 6792 (144%)

Pixel Rate

If using high levels of AA is important to you, then the GeForce 820M is the winner, and very much so. (explain)

GeForce 820M 2876 Mpixels/sec
GeForce GT 310 2356 Mpixels/sec
Difference: 520 (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 820M

Amazon.com

Check prices at:

GeForce GT 310

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 820M GeForce GT 310
Manufacturer nVidia nVidia
Year February 2014 November 2009
Code Name GF117 GT218
Memory 2048 MB 512 MB
Core Speed 719 MHz 589 MHz
Memory Speed 2000 MHz 2000 MHz
Power (Max TDP) 15 watts 31 watts
Bandwidth 16000 MB/sec 16000 MB/sec
Texel Rate 11504 Mtexels/sec 4712 Mtexels/sec
Pixel Rate 2876 Mpixels/sec 2356 Mpixels/sec
Unified Shaders 96 16
Texture Mapping Units 16 8
Render Output Units 4 4
Bus Type DDR3 DDR2
Bus Width 64-bit 64-bit
Fab Process 28 nm 40 nm
Transistors (Unknown) million 260 million
Bus PCIe 2.0 x16 PCIe 2.0
DirectX Version DirectX 12 DirectX 10.1
OpenGL Version OpenGL 4.5 OpenGL 3.1

Memory Bandwidth: Memory bandwidth is the max amount of information (counted in megabytes per second) that can be transferred over the external memory interface in one second. The number is calculated by multiplying the card's bus width by its memory clock speed. If it uses DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster 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 applied in one second. This number is calculated 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 card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

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GeForce 820M

Amazon.com

Check prices at:

GeForce GT 310

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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