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GeForce GT 420 vs GeForce GTX 850M

Intro

The GeForce GT 420 has a clock speed of 700 MHz and a GDDR3 memory frequency of 900 MHz. It also uses a 128-bit bus, and uses a 40 nm design. It features 48 SPUs, 8 Texture Address Units, and 4 Raster Operation Units.

Compare all that to the GeForce GTX 850M, which uses a 28 nm design. nVidia has clocked the core frequency at 876 MHz. The DDR3 RAM is set to run at a frequency of 1000 MHz on this specific model. It features 640 SPUs as well as 40 TAUs and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 850M 40 Watts
GeForce GT 420 50 Watts
Difference: 10 Watts (25%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 850M will be 11% quicker than the GeForce GT 420 in general, due to its higher bandwidth. (explain)

GeForce GTX 850M 32000 MB/sec
GeForce GT 420 28800 MB/sec
Difference: 3200 (11%)

Texel Rate

The GeForce GTX 850M should be a lot (approximately 526%) faster with regards to anisotropic filtering than the GeForce GT 420. (explain)

GeForce GTX 850M 35040 Mtexels/sec
GeForce GT 420 5600 Mtexels/sec
Difference: 29440 (526%)

Pixel Rate

The GeForce GTX 850M is quite a bit (about 401%) faster with regards to anti-aliasing than the GeForce GT 420, and also capable of handling higher screen resolutions without slowing down too much. (explain)

GeForce GTX 850M 14016 Mpixels/sec
GeForce GT 420 2800 Mpixels/sec
Difference: 11216 (401%)

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 GT 420

Amazon.com

Check prices at:

GeForce GTX 850M

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 GT 420 GeForce GTX 850M
Manufacturer nVidia nVidia
Year September 2010 March 12 2014
Code Name GF108 GM107
Memory 2048 MB 2048 MB
Core Speed 700 MHz 876 MHz
Memory Speed 1800 MHz 2000 MHz
Power (Max TDP) 50 watts 40 watts
Bandwidth 28800 MB/sec 32000 MB/sec
Texel Rate 5600 Mtexels/sec 35040 Mtexels/sec
Pixel Rate 2800 Mpixels/sec 14016 Mpixels/sec
Unified Shaders 48 640
Texture Mapping Units 8 40
Render Output Units 4 16
Bus Type GDDR3 DDR3
Bus Width 128-bit 128-bit
Fab Process 40 nm 28 nm
Transistors 585 million (Unknown) million
Bus PCIe x16 PCIe 3.0 x16
DirectX Version DirectX 11 DirectX 12
OpenGL Version OpenGL 4.1 OpenGL 4.5

Memory Bandwidth: Bandwidth is the largest amount of data (measured in megabytes per second) that can be moved over the external memory interface in a second. It is worked out by multiplying the bus width by the speed of its memory. If it uses DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This number is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better this number, the better the video 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 maximum amount of pixels the graphics card can possibly write to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

Hide Prices

GeForce GT 420

Amazon.com

Check prices at:

GeForce GTX 850M

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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