Zane; For the BEST performance you need the 'pairs' to be matched. Russell On Aug 15, 2010, at 5:30 PM, Zane H. Healy wrote: > I already know that if you're putting RAM in a Mac Pro, you want to have either 3 or 6 sticks. Having said that, I have a couple questions. If you have an 8 slot system do you take a performance hit if you only have 3 sticks? What if you have 6 sticks installed, do both sets of 3 need to be the same size? > > Zane > > > > > -- > | Zane H. Healy | UNIX Systems Administrator | > | healyzh at aracnet.com | OpenVMS Enthusiast | > | | Photographer | > +----------------------------------+----------------------------+ > | My flickr Photostream | > | http://www.flickr.com/photos/33848088@N03/ | > _______________________________________________ > X4U mailing list > X4U at listserver.themacintoshguy.com > http://listserver.themacintoshguy.com/mailman/listinfo/x4u > > Seven Cent Deals - Great legacy stuff Great Legacy Price > http://www.drbott.com/prod/db.lasso?cat=Seven+Cent+Deal