GeForce 940M vs GeForce GTX 580

Intro

Compare those specs to the GeForce GTX 580, which makes use of a 40 nm design. nVidia has clocked the core speed at 772 MHz. The GDDR5 RAM runs at a speed of 1002 MHz on this particular card. It features 512 SPUs as well as 64 Texture Address Units and 48 ROPs.

Display Graphs

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

GeForce GTX 580		4956 points
GeForce 940M		1740 points
	Difference: 3216 (185%)

Power Usage and Theoretical Benchmarks

Memory Bandwidth

As far as performance goes, the GeForce GTX 580 should in theory be quite a bit superior to the GeForce 940M in general. (explain)

GeForce GTX 580		192384 MB/sec
GeForce 940M		16000 MB/sec
	Difference: 176384 (1102%)

Texel Rate

The GeForce GTX 580 should be much (approximately 92%) faster with regards to AF than the GeForce 940M. (explain)

GeForce GTX 580		49408 Mtexels/sec
GeForce 940M		25728 Mtexels/sec
	Difference: 23680 (92%)

Pixel Rate

If running with a high screen resolution is important to you, then the GeForce GTX 580 is the winner, by a large margin. (explain)

GeForce GTX 580		37056 Mpixels/sec
GeForce 940M		8576 Mpixels/sec
	Difference: 28480 (332%)

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 information (measured in MB per second) that can be transferred across the external memory interface in one second. The number is worked out by multiplying the card's bus width by its memory speed. If the card has DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This figure is calculated by multiplying the total 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 applied per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.