scippy4848 :
Hello i'm running Vista ultimate 64-bit with dual channel memory. I have 2 gigs of dual channel PC2 6400 800 mhz memory (OCZ 2 1 gig sticks) and i want four gigs. I have 2 questions. The first is i'm going to buy ocz ram again but i hear that ram has to be the same voltage and there are some concerns regarding whether two different dual channel ram sets can work together. What should i worry about? also keep in mind i don't know the voltage on my set for there's different rev and i threw away the box and newegg no longer has it. I do know that the slower ram slows down all the ram but that's all. My second question is would it be better for me to get 4 gigs with 2 2gb sticks or 4 gigs with 4 1gig sticks. Is either one superior in terms of speed?
Well, I wish I knew if you had a dual or Quad Core CPU. Best practice is to have a stick per core. So if you have a quad, 4x1GB definitely. If it was a dual core, I would probably keep the 1GB and throw the 2x2GB in anyway. You can check the voltage and delays on most decent MoBo's in the tweaking section. I found if I'm close, I rarely have an issue. Also, make sure the matching sticks are staggered, ie first pair occupy DIMM slot 1 and 3 and the second pair are 2 and 4. In thay case they would almost always crap out after a 10 minutes or so if the have different specs. I believe the stagger allows the double rate as they are thus one separate channels (simplified).
With all that, unless you are really taxing your hardware, my guess is the bottlenecks will be elsewhere on the board. Either way, I have been able to run XenServer 4.1 with 2 Windows 2008 Servers as Domain Controllers, another as an Exchange (for 5 people) a Apache web server on Fedora and Windows Home Server. Occassionally I came close to 70% memory, but I am averaging less than 50% CPU even during intentional heavy test loads.
In case your wondering, Core 2 6400 with custom OEM'd PC2-5300 4x1GB (Only registers as 3.25 - thanks Intel) on an MSI Power Edition. Some overcloxking, but nothing TH style.
So after that, either option would probably be fine!