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/ |