Re: GeForce MX 4xx differences.
The MX400 is probably a GeForce2 MX400. Oldest of the lot, predates the GF4 MXs by a coupla years.
The MX440 is a GeForce4 MX440. Performs much better than the MX400.
The MX4000 is just a renamed GeForce4 MX440 with AGP8x AFAIK.
They all share the same technology though, being only DirectX 7 cards.
Gigabyte GA-P55-UD4 - Core i7 860 2.8 GHz - 4GB PC10666 RAM - Samsung F1 1TB drive - 18x DVD RW - GeForce GTS 250 512MB (to be replaced) - Corsair HX750 - LianLi PC2110B case - Windows 7 64