GeForce GTX 580 vs GeForce GTX 850M

Intro

Compare those specs to the GeForce GTX 850M, which has GPU clock speed of 876 MHz, and 2048 MB of DDR3 RAM set to run at 1000 MHz through a 128-bit bus. It also is made up of 640 Stream Processors, 40 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

Hide Graphs

Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

GeForce GTX 580		4956 points
GeForce GTX 850M		3340 points
	Difference: 1616 (48%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

As far as performance goes, the GeForce GTX 580 should in theory be much superior to the GeForce GTX 850M overall. (explain)

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

Texel Rate

The GeForce GTX 580 should be a lot (about 41%) more effective at anisotropic filtering than the GeForce GTX 850M. (explain)

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

Pixel Rate

The GeForce GTX 580 will be quite a bit (about 164%) more effective at full screen anti-aliasing than the GeForce GTX 850M, and should be able to handle higher resolutions without losing too much performance. (explain)

GeForce GTX 580		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 maximum amount of data (measured in MB per second) that can be moved past the external memory interface within a second. The number is worked out by multiplying the interface width by its memory speed. In the case of DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. 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 amount of texture map elements (texels) that can be processed in one second. This figure is worked out by multiplying the total number of texture units by the core speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum number 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 calculated by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.