GeForce 840M vs GeForce GTX 260 216SP 55 nm

Intro

Compare those specs to the GeForce GTX 260 216SP 55 nm, which uses a 55 nm design. nVidia has clocked the core speed at 576 MHz. The GDDR3 RAM runs at a speed of 999 MHz on this model. It features 216 SPUs along with 72 TAUs and 28 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 840M		30 Watts
GeForce GTX 260 216SP 55 nm		171 Watts
	Difference: 141 Watts (470%)

Memory Bandwidth

The GeForce GTX 260 216SP 55 nm should theoretically perform much faster than the GeForce 840M in general. (explain)

GeForce GTX 260 216SP 55 nm		111888 MB/sec
GeForce 840M		16000 MB/sec
	Difference: 95888 (599%)

Texel Rate

The GeForce GTX 260 216SP 55 nm will be quite a bit (about 68%) better at AF than the GeForce 840M. (explain)

GeForce GTX 260 216SP 55 nm		41472 Mtexels/sec
GeForce 840M		24696 Mtexels/sec
	Difference: 16776 (68%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the GeForce GTX 260 216SP 55 nm is superior to the GeForce 840M, and very much so. (explain)

GeForce GTX 260 216SP 55 nm		16128 Mpixels/sec
GeForce 840M		8232 Mpixels/sec
	Difference: 7896 (96%)

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 largest amount of data (in units of MB per second) that can be transported across the external memory interface in a second. The number is worked out by multiplying the card's interface width by its memory clock speed. If it uses DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the 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 is calculated by multiplying the total amount of texture units by the core speed of the chip. The better this number, the better the graphics 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 maximum number of pixels that the graphics chip could possibly write to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.