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GeForce 940M vs GeForce GT 420

Intro

The GeForce 940M has core speeds of 1072 MHz on the GPU, and 1000 MHz on the 2048 MB of DDR3 memory. It features 384 SPUs as well as 24 TAUs and 8 ROPs.

Compare those specifications to the GeForce GT 420, which comes with a clock frequency of 700 MHz and a GDDR3 memory speed of 900 MHz. It also features a 128-bit bus, and uses a 40 nm design. It is comprised of 48 SPUs, 8 Texture Address Units, and 4 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the GeForce GT 420 should be 80% faster than the GeForce 940M in general, due to its higher bandwidth. (explain)

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

Texel Rate

The GeForce 940M is quite a bit (approximately 359%) better at anisotropic 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 is much (approximately 206%) better at FSAA than the GeForce GT 420, and should be able to handle higher resolutions while still performing well. (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

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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 moved across the external memory interface in one second. It's calculated by multiplying the card's interface width by its memory clock speed. In the case of DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied per second. This number is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The higher the texel rate, the better the 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 most pixels that the graphics chip could possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the 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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