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GeForce 820M vs GeForce GT 310

Intro

The GeForce 820M makes use of a 28 nm design. nVidia has set the core speed at 719 MHz. The DDR3 RAM is set to run at a frequency of 1000 MHz on this specific card. It features 96 SPUs as well as 16 TAUs and 4 ROPs.

Compare those specs to the GeForce GT 310, which makes use of a 40 nm design. nVidia has clocked the core speed at 589 MHz. The DDR2 RAM works at a frequency of 1000 MHz on this particular model. It features 16 SPUs along with 8 TAUs and 4 ROPs.

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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 the exact same bandwidth, so in theory they should have the same performance. (explain)

Texel Rate

The GeForce 820M will be quite a bit (about 144%) better at texture 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 a better choice, by a large margin. (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 (measured in megabytes per second) that can be transferred across the external memory interface in one second. It is worked out by multiplying the bus width by its memory clock speed. In the case of DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, 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 number of texture map elements (texels) that can be applied per second. This is calculated by multiplying the total texture units of the card by the core speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly write to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum 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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