GeForce GT 240 GDDR5 vs GeForce GTX 870M

Intro

Compare those specifications to the GeForce GTX 870M, which has 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 Texture Address Units and 24 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

As far as performance goes, the GeForce GTX 870M should theoretically be a lot better than the GeForce GT 240 GDDR5 overall. (explain)

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

Texel Rate

The GeForce GTX 870M will be much (more or less 499%) better at AF than the GeForce GT 240 GDDR5. (explain)

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

Pixel Rate

If using lots of anti-aliasing is important to you, then the GeForce GTX 870M is superior to the GeForce GT 240 GDDR5, by a large margin. (explain)

GeForce GTX 870M		22584 Mpixels/sec
GeForce GT 240 GDDR5		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: Memory bandwidth is the largest amount of information (in units of megabytes per second) that can be transported past the external memory interface in one second. The number is worked out by multiplying the card's interface width by the speed of its memory. If the card has DDR type memory, it should be multiplied by 2 once 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 high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied per second. This figure is worked out by multiplying the total number of texture units 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 one second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly record to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.