I've compiled a table that compares all the features the available NVIDIA chipsets so that you can see the differences much easier.
|GeForce||GeForce2 MX||GeForce2 GTS|
|Manufacturing Process||.25 micron||.18 micron||.18 micron|
|Textures per Pipeline||1||2||2|
|Core Speed||120 MHz||175 MHz||200 MHz|
|Memory Interface/Speed||128 bit / 166 - 300 MHz||64 or 128 bit / 166 - 300 MHz||128 bit / 333 MHz|
|Pixel Fill-Rate||480 Mpixels/sec||350 Mpixels/sec||800 Mpixels/sec|
|Texel Fill-Rate||480 Mtexels/sec||700 Mtexels/sec||1.6 Gtexels/sec|
|Digital Vibrant Control||No||Yes||No|
|Retail Price||$179 - $249||$99 - $179||$299|
There are a few things to note about the above table:
Memory Interface : I can't stress how important it is to make sure you know what interface a GeForce2 MX board is based on before comparing it with anything. If you care about having good 3D performance, make sure you don't get stuck with a 64 bit SDR board or you'll most likely regret it. Theoretically there's also the possibility of a 128 bit DDR solution, which would automatically score a lot better at high color/high resolution. However, this combination would destroy the low-cost idea of GeForce2 MX and is thus rather unlikely.
HDVP : The GeForce2 MX is lacking some of the high-end visual modes that the GeForce2 GTS has so keep that in mind if you are into higher end video output.
Active Cooling : Our reference board didn't have any cooling at all and most manufacturers will probably opt not to as it is a low cost solution. However, this doesn't mean it cannot happen.
Retail Price : The GeForce2 MX will vary greatly in price due to configuration differences like memory interface/size/type and video outputs. I would estimate that our reference board configuration would probably sell for $129.