GeForce GT 240 GDDR5 1GB 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 memory running at 1000 MHz through a 128-bit bus. It also is made up of 640 SPUs, 40 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 850M		40 Watts
GeForce GT 240 GDDR5 1GB		70 Watts
	Difference: 30 Watts (75%)

Memory Bandwidth

Performance-wise, the GeForce GT 240 GDDR5 1GB should theoretically be quite a bit superior to the GeForce GTX 850M in general. (explain)

GeForce GT 240 GDDR5 1GB		54400 MB/sec
GeForce GTX 850M		32000 MB/sec
	Difference: 22400 (70%)

Texel Rate

The GeForce GTX 850M should be a lot (more or less 99%) more effective at AF than the GeForce GT 240 GDDR5 1GB. (explain)

GeForce GTX 850M		35040 Mtexels/sec
GeForce GT 240 GDDR5 1GB		17600 Mtexels/sec
	Difference: 17440 (99%)

Pixel Rate

The GeForce GTX 850M should be a lot (more or less 219%) faster with regards to anti-aliasing than the GeForce GT 240 GDDR5 1GB, and should be capable of handling higher resolutions better. (explain)

GeForce GTX 850M		14016 Mpixels/sec
GeForce GT 240 GDDR5 1GB		4400 Mpixels/sec
	Difference: 9616 (219%)

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 transported past the external memory interface within a second. It's calculated by multiplying the card's interface width by its memory clock speed. If the card has DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range 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 amount of texture units of the card by the core clock speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics 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 Render Output Units 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 many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.