GeForce 940M vs GeForce 9800 GTX

Intro

Compare that to the GeForce 9800 GTX, which comes with GPU clock speed of 675 MHz, and 512 MB of GDDR3 RAM running at 1100 MHz through a 256-bit bus. It also is made up of 128 Stream Processors, 64 TAUs, and 16 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the GeForce 9800 GTX will be 340% faster than the GeForce 940M overall, because of its higher bandwidth. (explain)

GeForce 9800 GTX		70400 MB/sec
GeForce 940M		16000 MB/sec
	Difference: 54400 (340%)

Texel Rate

The GeForce 9800 GTX is a lot (more or less 68%) faster with regards to texture filtering than the GeForce 940M. (explain)

GeForce 9800 GTX		43200 Mtexels/sec
GeForce 940M		25728 Mtexels/sec
	Difference: 17472 (68%)

Pixel Rate

If running with a high screen resolution is important to you, then the GeForce 9800 GTX is the winner, by a large margin. (explain)

GeForce 9800 GTX		10800 Mpixels/sec
GeForce 940M		8576 Mpixels/sec
	Difference: 2224 (26%)

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 maximum amount of data (measured in megabytes per second) that can be transported over the external memory interface in a second. It's worked out by multiplying the interface width by its memory speed. If the card has DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed in one second. This is calculated by multiplying the total amount of texture units by the core speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.