nForce chipset - how good is the onboard GPU?

[casanovalui]

the chipset has the intergrated Geforce2 MX400 up to 32mb.
Does the intergrated Geforce2 MX400 32mb as good as the plug-in Geforce2 MX400 32mb?
It still has an AGP slot tho. Can i use both plug-in and on-board GPU at the same time?
The chipset make the mobo not clockable, how far is this true?
Which chipset is better in your opinion Via KT266A or nForce 420 ??
Thank you.

[gsxr750]

I would said you can't use both at the same time. if you are going to use the plug-in one then the onboard GPU have to be disable first. Then plug-in would be better and run faster. Most of the board I see that come integrade with GPU will use share memory. Which mean it will took up part of you RAM memory.

why get intergrade GPU while you have one. It just going to cause more trouble when you disable it.