GeForce 9800 GT 1GB vs GeForce GTX 850M

Intro

Compare all that to the GeForce GTX 850M, which features core 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 TAUs and 16 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 850M		40 Watts
GeForce 9800 GT 1GB		105 Watts
	Difference: 65 Watts (163%)

Memory Bandwidth

Theoretically speaking, the GeForce 9800 GT 1GB should be 80% faster than the GeForce GTX 850M overall, due to its greater bandwidth. (explain)

GeForce 9800 GT 1GB		57600 MB/sec
GeForce GTX 850M		32000 MB/sec
	Difference: 25600 (80%)

Texel Rate

The GeForce GTX 850M will be a bit (about 4%) more effective at texture filtering than the GeForce 9800 GT 1GB. (explain)

GeForce GTX 850M		35040 Mtexels/sec
GeForce 9800 GT 1GB		33600 Mtexels/sec
	Difference: 1440 (4%)

Pixel Rate

The GeForce GTX 850M should be quite a bit (more or less 46%) faster with regards to full screen anti-aliasing than the GeForce 9800 GT 1GB, and also able to handle higher screen resolutions without losing too much performance. (explain)

GeForce GTX 850M		14016 Mpixels/sec
GeForce 9800 GT 1GB		9600 Mpixels/sec
	Difference: 4416 (46%)

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 (in units of MB per second) that can be moved over the external memory interface in one second. The number is worked out by multiplying the bus width by its memory clock speed. In the case of DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's 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 are applied in one second. This figure is worked out by multiplying the total texture units of the card 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 processed per second.

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