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GeForce 820M vs GeForce GT 315

Intro

The GeForce 820M has core speeds of 719 MHz on the GPU, and 1000 MHz on the 2048 MB of DDR3 RAM. It features 96 SPUs along with 16 TAUs and 4 Rasterization Operator Units.

Compare those specs to the GeForce GT 315, which makes use of a 40 nm design. nVidia has clocked the core frequency at 625 MHz. The DDR3 memory is set to run at a speed of 790 MHz on this particular card. It features 48 SPUs as well as 16 Texture Address Units and 8 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M 15 Watts
GeForce GT 315 52 Watts
Difference: 37 Watts (247%)

Memory Bandwidth

As far as performance goes, the GeForce GT 315 should in theory be much better than the GeForce 820M in general. (explain)

GeForce GT 315 25280 MB/sec
GeForce 820M 16000 MB/sec
Difference: 9280 (58%)

Texel Rate

The GeForce 820M is just a bit (more or less 15%) better at AF than the GeForce GT 315. (explain)

GeForce 820M 11504 Mtexels/sec
GeForce GT 315 10000 Mtexels/sec
Difference: 1504 (15%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the GeForce GT 315 is the winner, by far. (explain)

GeForce GT 315 5000 Mpixels/sec
GeForce 820M 2876 Mpixels/sec
Difference: 2124 (74%)

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 315

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 315
Manufacturer nVidia nVidia
Year February 2014 November 2009
Code Name GF117 GT216
Memory 2048 MB 512 MB
Core Speed 719 MHz 625 MHz
Memory Speed 2000 MHz 1580 MHz
Power (Max TDP) 15 watts 52 watts
Bandwidth 16000 MB/sec 25280 MB/sec
Texel Rate 11504 Mtexels/sec 10000 Mtexels/sec
Pixel Rate 2876 Mpixels/sec 5000 Mpixels/sec
Unified Shaders 96 48
Texture Mapping Units 16 16
Render Output Units 4 8
Bus Type DDR3 DDR3
Bus Width 64-bit 128-bit
Fab Process 28 nm 40 nm
Transistors (Unknown) million 486 million
Bus PCIe 2.0 x16 PCIe 2.0
DirectX Version DirectX 12 DirectX 10.1
OpenGL Version OpenGL 4.5 OpenGL 3.2

Memory Bandwidth: Bandwidth is the largest amount of data (in units of MB per second) that can be transported past the external memory interface within a second. It is worked out by multiplying the interface width by its memory speed. In the case of DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This is calculated by multiplying the total texture units by the core clock speed of the chip. The higher this number, the better the graphics card will be at handling 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 chip could possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the the card's clock speed. 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 is also dependant on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

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GeForce 820M

Amazon.com

Check prices at:

GeForce GT 315

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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