On Thu, Oct 06, 2005 at 09:06:43PM -0400, Anthony DeRobertis wrote: > What happens when you run with just the 512MB DIMM? The 1GB DIMM could > just be defective. > > [Also, if you want dual-channel, you have to two identical DIMMs] Socket 754 doesn't do dual channel so that should matter. Len Sorensen