GeForce GTX 580 3GB vs GeForce GTX 850M

Intro

Compare those specs to the GeForce GTX 850M, which comes with a clock speed of 876 MHz and a DDR3 memory frequency of 1000 MHz. It also uses a 128-bit memory bus, and makes use of a 28 nm design. It features 640 SPUs, 40 TAUs, and 16 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 850M		40 Watts
GeForce GTX 580 3GB		244 Watts
	Difference: 204 Watts (510%)

Memory Bandwidth

The GeForce GTX 580 3GB should in theory perform much faster than the GeForce GTX 850M in general. (explain)

GeForce GTX 580 3GB		192384 MB/sec
GeForce GTX 850M		32000 MB/sec
	Difference: 160384 (501%)

Texel Rate

The GeForce GTX 580 3GB is a lot (more or less 41%) more effective at anisotropic filtering than the GeForce GTX 850M. (explain)

GeForce GTX 580 3GB		49408 Mtexels/sec
GeForce GTX 850M		35040 Mtexels/sec
	Difference: 14368 (41%)

Pixel Rate

The GeForce GTX 580 3GB will be much (approximately 164%) more effective at FSAA than the GeForce GTX 850M, and also will be able to handle higher screen resolutions more effectively. (explain)

GeForce GTX 580 3GB		37056 Mpixels/sec
GeForce GTX 850M		14016 Mpixels/sec
	Difference: 23040 (164%)

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 (counted in megabytes per second) that can be moved past the external memory interface within a second. It is worked out by multiplying the card's bus width by its memory clock speed. If it uses DDR RAM, 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 AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.