GeForce 825M vs GeForce 940M

Intro

Compare that to the GeForce 940M, which uses a 28 nm design. nVidia has clocked the core speed at 1072 MHz. The DDR3 memory runs at a speed of 1000 MHz on this specific card. It features 384 SPUs as well as 24 Texture Address Units and 8 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

As far as performance goes, the GeForce 940M should theoretically be just a bit better than the GeForce 825M overall. (explain)

GeForce 940M		16000 MB/sec
GeForce 825M		14400 MB/sec
	Difference: 1600 (11%)

Texel Rate

The GeForce 940M will be quite a bit (more or less 89%) faster with regards to anisotropic filtering than the GeForce 825M. (explain)

GeForce 940M		25728 Mtexels/sec
GeForce 825M		13600 Mtexels/sec
	Difference: 12128 (89%)

Pixel Rate

If using a high resolution is important to you, then the GeForce 940M is a better choice, by a large margin. (explain)

GeForce 940M		8576 Mpixels/sec
GeForce 825M		6800 Mpixels/sec
	Difference: 1776 (26%)

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 MB per second) that can be transported over the external memory interface in one second. The number is worked out by multiplying the interface width by the speed of its memory. If it uses DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed in one second. This number is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly write to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.