GeForce 940M vs GeForce GTX 580

Intro

Compare that to the GeForce GTX 580, which features a core clock frequency of 772 MHz and a GDDR5 memory speed of 1002 MHz. It also uses a 384-bit bus, and uses a 40 nm design. It is comprised of 512 SPUs, 64 TAUs, 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

In theory, the GeForce GTX 580 should be a lot faster than 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 (about 92%) more effective at anisotropic filtering 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 resolution is important to you, then the GeForce GTX 580 is a better choice, by far. (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: Memory bandwidth is the max amount of information (measured in MB per second) that can be moved across the external memory interface within a second. The number is calculated by multiplying the bus width by the speed of its memory. If it uses DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, 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 processed in one second. This figure is calculated by multiplying the total number of texture units by the core speed of the chip. The better the texel rate, the better the 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 the graphics card can possibly write to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units by the the card's clock speed. 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 output rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.