GeForce 830M vs GeForce GTX 850M

Intro

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

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 830M		25 Watts
GeForce GTX 850M		40 Watts
	Difference: 15 Watts (60%)

Memory Bandwidth

The GeForce GTX 850M, in theory, should be much faster than the GeForce 830M in general. (explain)

GeForce GTX 850M		32000 MB/sec
GeForce 830M		14400 MB/sec
	Difference: 17600 (122%)

Texel Rate

The GeForce GTX 850M is quite a bit (more or less 113%) better at texture filtering than the GeForce 830M. (explain)

GeForce GTX 850M		35040 Mtexels/sec
GeForce 830M		16464 Mtexels/sec
	Difference: 18576 (113%)

Pixel Rate

The GeForce GTX 850M will be quite a bit (more or less 70%) faster with regards to AA than the GeForce 830M, and capable of handling higher resolutions more effectively. (explain)

GeForce GTX 850M		14016 Mpixels/sec
GeForce 830M		8232 Mpixels/sec
	Difference: 5784 (70%)

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 largest amount of information (measured in MB per second) that can be transported across the external memory interface in a second. It's calculated by multiplying the card's bus width by its memory speed. If the card has DDR memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This 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 card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly record to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.