GeForce 8500 GT vs GeForce GTX 850M

Intro

Compare those specs to the GeForce GTX 850M, which features a clock frequency 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 is comprised of 640 SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 850M		40 Watts
GeForce 8500 GT		45 Watts
	Difference: 5 Watts (13%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 850M should theoretically be a lot better than the GeForce 8500 GT in general. (explain)

GeForce GTX 850M		32000 MB/sec
GeForce 8500 GT		12800 MB/sec
	Difference: 19200 (150%)

Texel Rate

The GeForce GTX 850M should be a lot (more or less 873%) more effective at texture filtering than the GeForce 8500 GT. (explain)

GeForce GTX 850M		35040 Mtexels/sec
GeForce 8500 GT		3600 Mtexels/sec
	Difference: 31440 (873%)

Pixel Rate

The GeForce GTX 850M should be quite a bit (approximately 679%) faster with regards to AA than the GeForce 8500 GT, and also should be able to handle higher resolutions without losing too much performance. (explain)

GeForce GTX 850M		14016 Mpixels/sec
GeForce 8500 GT		1800 Mpixels/sec
	Difference: 12216 (679%)

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 largest amount of data (measured in megabytes per second) that can be moved over the external memory interface within a second. It is calculated by multiplying the interface width by its memory clock speed. In the case of DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better 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 are processed in one second. This number is calculated 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 handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.