GeForce 830M vs GeForce GTX 870M

Intro

Compare all that to the GeForce GTX 870M, which comes with core speeds of 941 MHz on the GPU, and 1000 MHz on the 3072 MB of GDDR5 memory. It features 1344 SPUs as well as 112 TAUs and 24 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 830M		25 Watts
GeForce GTX 870M		110 Watts
	Difference: 85 Watts (340%)

Memory Bandwidth

The GeForce GTX 870M should theoretically perform quite a bit faster than the GeForce 830M in general. (explain)

GeForce GTX 870M		96000 MB/sec
GeForce 830M		14400 MB/sec
	Difference: 81600 (567%)

Texel Rate

The GeForce GTX 870M will be much (approximately 540%) more effective at texture filtering than the GeForce 830M. (explain)

GeForce GTX 870M		105392 Mtexels/sec
GeForce 830M		16464 Mtexels/sec
	Difference: 88928 (540%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the GeForce GTX 870M is the winner, by a large margin. (explain)

GeForce GTX 870M		22584 Mpixels/sec
GeForce 830M		8232 Mpixels/sec
	Difference: 14352 (174%)

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 maximum amount of information (counted in megabytes per second) that can be transported across the external memory interface in a second. It's calculated by multiplying the interface width by its memory clock speed. If it uses DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.