Well, No probs here so far. Some tech at another supplier was bleeting about not being able to run Mix cards in the Dual 1 Gig machines, But so far I've had no problems whatsoever.... We did a 001 Rig before these reports came out too, and I phoned the client to check all was well when I heard, and he's running well also. It seems its certain motherboard 'revisions' that are causing the reported problems, But I think you'll be pretty safe with Mix Rigs.... If I experience/see different I'll report back straight away....
Having said that, I'm gonna do a week long test of the 1.25 Gigger, as its a whole new ball game (buss speed etc....) I think if there are any problems above whats been reported, then they'll show on these top end Macs....
Al.