GeForce GTX 660 vs GeForce GTX 850M

Intro

Compare those specifications to the GeForce GTX 850M, which features clock speeds of 876 MHz on the GPU, and 1000 MHz on the 2048 MB of DDR3 RAM. It features 640 SPUs as well as 40 Texture Address Units and 16 Rasterization Operator 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 660		5063 points
GeForce GTX 850M		3340 points
	Difference: 1723 (52%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 850M		40 Watts
GeForce GTX 660		140 Watts
	Difference: 100 Watts (250%)

Memory Bandwidth

The GeForce GTX 660, in theory, should be quite a bit faster than the GeForce GTX 850M overall. (explain)

GeForce GTX 660		144192 MB/sec
GeForce GTX 850M		32000 MB/sec
	Difference: 112192 (351%)

Texel Rate

The GeForce GTX 660 should be quite a bit (about 124%) better at AF than the GeForce GTX 850M. (explain)

GeForce GTX 660		78400 Mtexels/sec
GeForce GTX 850M		35040 Mtexels/sec
	Difference: 43360 (124%)

Pixel Rate

The GeForce GTX 660 is a lot (approximately 68%) more effective at FSAA than the GeForce GTX 850M, and also will be capable of handling higher resolutions better. (explain)

GeForce GTX 660		23520 Mpixels/sec
GeForce GTX 850M		14016 Mpixels/sec
	Difference: 9504 (68%)

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 information (counted in MB per second) that can be transported across the external memory interface in a second. The number is calculated by multiplying the card's interface width by its memory clock speed. If the card has DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card can possibly record to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.