GeForce 810M vs GeForce GT 420

Intro

Compare that to the GeForce GT 420, which uses a 40 nm design. nVidia has clocked the core frequency at 700 MHz. The GDDR3 RAM is set to run at a frequency of 900 MHz on this particular model. It features 48 SPUs along with 8 TAUs and 4 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 810M		15 Watts
GeForce GT 420		50 Watts
	Difference: 35 Watts (233%)

Memory Bandwidth

Theoretically speaking, the GeForce GT 420 should be 100% quicker than the GeForce 810M overall, because of its greater bandwidth. (explain)

GeForce GT 420		28800 MB/sec
GeForce 810M		14400 MB/sec
	Difference: 14400 (100%)

Texel Rate

The GeForce 810M is a small bit (approximately 5%) better at anisotropic filtering than the GeForce GT 420. (explain)

GeForce 810M		5904 Mtexels/sec
GeForce GT 420		5600 Mtexels/sec
	Difference: 304 (5%)

Pixel Rate

The GeForce 810M is a small bit (more or less 5%) faster with regards to AA than the GeForce GT 420, and should be capable of handling higher resolutions while still performing well. (explain)

GeForce 810M		2952 Mpixels/sec
GeForce GT 420		2800 Mpixels/sec
	Difference: 152 (5%)

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

Specifications

Memory Bandwidth: Memory bandwidth is the max amount of data (measured in megabytes per second) that can be moved over the external memory interface in a second. It's calculated by multiplying the interface width by the speed of its memory. In the case of DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The better this number, 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 maximum amount of pixels that the graphics chip could possibly write to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.