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GeForce 840M vs GeForce GT 310

Intro

The GeForce 840M features core clock speeds of 1029 MHz on the GPU, and 1000 MHz on the 2048 MB of DDR3 RAM. It features 384 SPUs along with 24 Texture Address Units and 8 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 memory is set to run at a speed of 1000 MHz on this particular card. It features 16 SPUs as well as 8 TAUs and 4 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 840M 30 Watts
GeForce GT 310 31 Watts
Difference: 1 Watts (3%)

Memory Bandwidth

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

Texel Rate

The GeForce 840M will be a lot (approximately 424%) better at AF than the GeForce GT 310. (explain)

GeForce 840M 24696 Mtexels/sec
GeForce GT 310 4712 Mtexels/sec
Difference: 19984 (424%)

Pixel Rate

The GeForce 840M will be much (more or less 249%) better at full screen anti-aliasing than the GeForce GT 310, and should be capable of handling higher resolutions without losing too much performance. (explain)

GeForce 840M 8232 Mpixels/sec
GeForce GT 310 2356 Mpixels/sec
Difference: 5876 (249%)

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 840M

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 840M GeForce GT 310
Manufacturer nVidia nVidia
Year March 12 2014 November 2009
Code Name GM108 GT218
Memory 2048 MB 512 MB
Core Speed 1029 MHz 589 MHz
Memory Speed 2000 MHz 2000 MHz
Power (Max TDP) 30 watts 31 watts
Bandwidth 16000 MB/sec 16000 MB/sec
Texel Rate 24696 Mtexels/sec 4712 Mtexels/sec
Pixel Rate 8232 Mpixels/sec 2356 Mpixels/sec
Unified Shaders 384 16
Texture Mapping Units 24 8
Render Output Units 8 4
Bus Type DDR3 DDR2
Bus Width 64-bit 64-bit
Fab Process 28 nm 40 nm
Transistors (Unknown) million 260 million
Bus PCIe 3.0 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 largest amount of data (in units of megabytes per second) that can be moved past the external memory interface within a second. The number is worked out by multiplying the bus width by its memory clock speed. If the card has DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per second. This figure is worked out by multiplying the total amount of texture units of the card 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 in a second.

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

Display Prices

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GeForce 840M

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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