GeForce GT 240 GDDR5 1GB vs GeForce GTX 870M

Intro

Compare all of that to the GeForce GTX 870M, which features core clock speeds of 941 MHz on the GPU, and 1000 MHz on the 3072 MB of GDDR5 RAM. It features 1344 SPUs as well as 112 TAUs and 24 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 240 GDDR5 1GB		70 Watts
GeForce GTX 870M		110 Watts
	Difference: 40 Watts (57%)

Memory Bandwidth

Performance-wise, the GeForce GTX 870M should in theory be a lot superior to the GeForce GT 240 GDDR5 1GB overall. (explain)

GeForce GTX 870M		96000 MB/sec
GeForce GT 240 GDDR5 1GB		54400 MB/sec
	Difference: 41600 (76%)

Texel Rate

The GeForce GTX 870M is quite a bit (about 499%) better at anisotropic filtering than the GeForce GT 240 GDDR5 1GB. (explain)

GeForce GTX 870M		105392 Mtexels/sec
GeForce GT 240 GDDR5 1GB		17600 Mtexels/sec
	Difference: 87792 (499%)

Pixel Rate

The GeForce GTX 870M is a lot (about 413%) better at full screen anti-aliasing than the GeForce GT 240 GDDR5 1GB, and will be able to handle higher resolutions without losing too much performance. (explain)

GeForce GTX 870M		22584 Mpixels/sec
GeForce GT 240 GDDR5 1GB		4400 Mpixels/sec
	Difference: 18184 (413%)

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 max amount of data (in units of megabytes per second) that can be transported past the external memory interface within a second. The number is worked out by multiplying the card's interface width by its memory speed. If it uses DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better 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 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 speed of the chip. The higher the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

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