GeForce GT 320 vs GeForce GTX 850M

Intro

Compare those specifications to the GeForce GTX 850M, which features core speeds of 876 MHz on the GPU, and 1000 MHz on the 2048 MB of DDR3 memory. It features 640 SPUs along with 40 TAUs and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 850M		40 Watts
GeForce GT 320		43 Watts
	Difference: 3 Watts (8%)

Memory Bandwidth

The GeForce GTX 850M, in theory, should be a lot faster than the GeForce GT 320 overall. (explain)

GeForce GTX 850M		32000 MB/sec
GeForce GT 320		25280 MB/sec
	Difference: 6720 (27%)

Texel Rate

The GeForce GTX 850M should be much (approximately 170%) more effective at AF than the GeForce GT 320. (explain)

GeForce GTX 850M		35040 Mtexels/sec
GeForce GT 320		12960 Mtexels/sec
	Difference: 22080 (170%)

Pixel Rate

The GeForce GTX 850M will be much (more or less 224%) more effective at AA than the GeForce GT 320, and also should be capable of handling higher screen resolutions better. (explain)

GeForce GTX 850M		14016 Mpixels/sec
GeForce GT 320		4320 Mpixels/sec
	Difference: 9696 (224%)

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: Bandwidth is the maximum amount of data (measured in MB per second) that can be transferred across the external memory interface within a second. It is calculated by multiplying the card's bus width by its memory clock speed. If the card has DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This figure 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 card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly record to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units by the clock 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 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.