Sorry to resurect something this old but I feel the question I have would serve other who are searching better if it existed alongside this explanation.
I just bought a Dell r710. I got it for $350 w/ 2 CPUs and all the drives are 300GB 15k drives.
It was advertised with 72GB of ram but when I pulled it out I found that it only has 48GB.
When I bought it I really didn’t know if it was going to be dual triple or quad but it’s triple which I have some experience with almost a decade ago with the 1366 CPUs.
Anyways long story short is this.
I contacted the seller and he says it was a mistake and that he had 2 710s one with 4 and 1 with 6 drives and one with 48 and the other with 72. He accidentally labeled the 4 drive one as 48 (and I did see that) and the 6 drive one as 72.
He said he was willing to resolve the issue. I told him he needs to give me 3 matching identical sticks of memory. The communication on his end got very short and he stopped answering all of my questions and started answering only certain questions.
Finally I find out the following.
He wants me to bring my 48GB of ram and exchange it for the 72GB. I said no way on Earth is that happening before he even had a chance to try to say anything else. I knew immediately that the ram I had must be more valuable.
That brings me to this. I have 6 8GB Crucial PC3L-12800R 1rx4 dimms he wants to trade me for 18 4GB Hynix PC3L-10600R 2rx8 dimms.
Thanks to this post I clearly understand the 1r vs 2r and its impact in the system.
I don’t understand the impact of x4 vs x8. I understand what it is referring too but not what it does to my machine.
I’m especially concerned with loading in 18 2r dimms because that’s now like having 36 pieces of memory vs the 6 I have now.
Another concern of mine is can the system handle 36 or can it only use those 3rd sticks as spares? Also my understanding is that with 18 sticks the system will be limited to 800 speed instead of 1333 or whatever.
Can someone explain the implications of filling all 3 slots of each channel with 2r instead of 1r and can anyone explain to me what impact the x4 vs x8 has.
At this point I would sooner just sell the 48GB of memory I have now and buy 96GBs of udimm. It seems as if that is totally plausible.
The machines expected use is as a lab, a router, a VM machine, and to plug my 16 bay dual 10gbit NAS into it so that it can run the software since the NAS doesn’t have a normal PC CPU in it. It sometimes struggles to transcode Plex and record the houses cameras at the same time. So I think for what I want it for I can get away with udimms instead of rdimms.
So a recap
Could you guys give me an idea of:
what the x4 and x8 impacts
Can the server use all 18 4GB dimms in triple channel mode or does the 2r become an issue at that point. If I stick with 8GB I’d only ever populate 2 sockets per channel to get to 96GB.
Is there a major impact to the ECCs ability between the rdimms and udimm.
Is 18 4GB 2r rdimms better than say 12 8GB udimms?