[G4] Upgrade options ?

[SLarsonIH at aol.com]

Hi all 

I just got a Dual 867 MDD model, and want to do a couple of upgrades to  it. 
Has anyone upgraded their Dual 867 (other model owners jump in too) with one 
of the aftermarket dual CPU cards, and what was your experience? My son has a 
dual 867 as well, and I was thinking of giving him my 2100 ram and putting in 
2700 ram. Is that possible, and would that be advantageous considering the 
upgrade card? If you don't have any personal experience, web sites that address 
this would be appreciated as well.

How do I tell if this machine has an internal modem? Under Network overview 
it says modem, but nothing after that. I tried to dial out but got nothing. Oh, 
does anyone know if a third party wireless card will work in a MDD, or is an 
Airport card the only choice? (I want to keep it internal) All comments would 
be appreciated.

TIA
STeve