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GeForce 940M vs GeForce GT 420

Intro

The GeForce 940M comes with core clock speeds of 1072 MHz on the GPU, and 1000 MHz on the 2048 MB of DDR3 RAM. It features 384 SPUs along with 24 TAUs and 8 ROPs.

Compare those specs to the GeForce GT 420, which has GPU clock speed of 700 MHz, and 2048 MB of GDDR3 memory running at 900 MHz through a 128-bit bus. It also is comprised of 48 Stream Processors, 8 Texture Address Units, and 4 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the GeForce GT 420 should be 80% quicker than the GeForce 940M overall, due to its greater data rate. (explain)

GeForce GT 420 28800 MB/sec
GeForce 940M 16000 MB/sec
Difference: 12800 (80%)

Texel Rate

The GeForce 940M will be a lot (about 359%) better at texture filtering than the GeForce GT 420. (explain)

GeForce 940M 25728 Mtexels/sec
GeForce GT 420 5600 Mtexels/sec
Difference: 20128 (359%)

Pixel Rate

The GeForce 940M should be a lot (about 206%) better at FSAA than the GeForce GT 420, and will be capable of handling higher screen resolutions better. (explain)

GeForce 940M 8576 Mpixels/sec
GeForce GT 420 2800 Mpixels/sec
Difference: 5776 (206%)

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 940M

Amazon.com

Check prices at:

GeForce GT 420

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 940M GeForce GT 420
Manufacturer nVidia nVidia
Year March 12 2015 September 2010
Code Name GM108 GF108
Memory 2048 MB 2048 MB
Core Speed 1072 MHz 700 MHz
Memory Speed 2000 MHz 1800 MHz
Power (Max TDP) (Unknown) watts 50 watts
Bandwidth 16000 MB/sec 28800 MB/sec
Texel Rate 25728 Mtexels/sec 5600 Mtexels/sec
Pixel Rate 8576 Mpixels/sec 2800 Mpixels/sec
Unified Shaders 384 48
Texture Mapping Units 24 8
Render Output Units 8 4
Bus Type DDR3 GDDR3
Bus Width 64-bit 128-bit
Fab Process 28 nm 40 nm
Transistors (Unknown) million 585 million
Bus PCIe 3.0 x16 PCIe x16
DirectX Version DirectX 12 DirectX 11
OpenGL Version OpenGL 4.5 OpenGL 4.1

Memory Bandwidth: Bandwidth is the maximum amount of data (in units of megabytes per second) that can be transferred over the external memory interface within a second. It's calculated by multiplying the card's interface width by its memory clock speed. In the case of DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better 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 number of texture map elements (texels) that are processed in one second. This figure is worked out by multiplying the total number 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 texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly record to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

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GeForce 940M

Amazon.com

Check prices at:

GeForce GT 420

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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