GeForce 825M vs GeForce GTX 850M

Intro

Compare those specifications to the GeForce GTX 850M, which makes use of a 28 nm design. nVidia has set the core frequency at 876 MHz. The DDR3 memory is set to run at a frequency of 1000 MHz on this particular model. It features 640 SPUs as well as 40 TAUs and 16 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 825M		33 Watts
GeForce GTX 850M		40 Watts
	Difference: 7 Watts (21%)

Memory Bandwidth

The GeForce GTX 850M, in theory, should perform a lot faster than the GeForce 825M overall. (explain)

GeForce GTX 850M		32000 MB/sec
GeForce 825M		14400 MB/sec
	Difference: 17600 (122%)

Texel Rate

The GeForce GTX 850M will be quite a bit (about 158%) more effective at AF than the GeForce 825M. (explain)

GeForce GTX 850M		35040 Mtexels/sec
GeForce 825M		13600 Mtexels/sec
	Difference: 21440 (158%)

Pixel Rate

The GeForce GTX 850M will be much (about 106%) faster with regards to FSAA than the GeForce 825M, and also will be capable of handling higher resolutions better. (explain)

GeForce GTX 850M		14016 Mpixels/sec
GeForce 825M		6800 Mpixels/sec
	Difference: 7216 (106%)

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: Bandwidth is the max amount of data (counted in megabytes per second) that can be transferred across the external memory interface within a second. It's calculated by multiplying the interface width by the speed of its memory. If it uses DDR memory, it should be multiplied by 2 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 are processed in one second. This figure is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The higher the texel rate, the better the video 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 most pixels that the graphics chip can possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.