IS 2Rx8 PC2-5300U 555-12E0 THIS THE SAME AS 5300 DDR2 667 MHZ ?
Yes. PC2=DDR2, 5300=663MHz, 555-12=5-5-5-12 aka latency/timings unless you're asking if unbuffered and buffered ram are the same...?
If that is the memory populated in your motherboard DIMM slots then yes you can go ahead and use it. You can be sure by downloading
CPU-Z and double checking your populated ram spec's.
ARE THERE BUFFERED/UNBUFFERED CONCERNS?
Have a
read through this link. I can't pinpoint your unit/machine but I'm going to assume this is a server/workstation machine thus the U at the end of that memory specs in which case you'll need to hunt for memory compatible for your system.
Crucial's/Corsair's memory adviser tool can help you kill your doubts.
If your motherboard supports it then go for it otherwise it may just be something more than you need and probably having to pay more for something that you can't take advantage of.
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