Dave, Thanks for the clarification. I assume none of the error... kernel: EDAC MC0: UE page 0x8e0, offset 0x0, grain 4096, row 0, labels ":": i82875p UE ...specifies which DIMM is failing and I'll have to resort to memtest86+? That is one thing nice about Solaris (at least on the older Ultras). When they have memory errors it specifies exactly which DIMM is failing. Jack