Originally Posted by Desolutional
No. JEDEC spec is aimed at a set frequency at a standard voltage of 1.2V for DDR4 RAM. Anything lower than 1.2V is only useful for ULP devices, all DDR4 mainstream systems use a standard DDR4 operating voltage of 1.2V. Up to 1.5V is "safe". Anything higher than 1.45V for 24/7 use is really pushing it. All said, XMP at 1.35V is perfectly safe assuming you know how to test your RAM after enabling it. 256GB (assuming 8x32GB sticks, that is double the density of 16GB sticks) at 3000MHz is extremely difficult to run, you'd need a world record breaking IMC to be able to handle that. 128GB at 2400MHz seems like a safer bet for 24/7 insane use. What would you need so much RAM for anyway? 32GB is plenty for a real high-end gaming machine with a little bit of rendering and VMware mixed in. I'd only go higher than 64GB if you were planning on running more than 20 VMs and in that case I'd suggest waiting for AMD's Zen Server or getting a Xeon. Once you go higher than 64GB (or 32GB) you really want to be looking at Error Correction sticks. Above 32GB it really is a matter of stability over performance, anything that can go wrong will go wrong so much more the more data you pack into a single stick of RAM.
If you really are set on running 20+ VMs and creating a render farm or putting Adobe creative users to shame, I'd suggest a dual socket Xeon board.
I'm planning of buying sticks for my office PCs, 2 PC.
I'm pretty sure that I will upgrade to Skylake-E as soon as it will be released but I don't want to waste money on RAM that I will not be able to use on Skylake-E due to voltage (1.35V).
I think that I need to wait Skylake-E to see if motherboards will support 1.35V safely. Am I right? Or you are pretty sure that Skylake-E motherboard will be able to handle 1.35V safely?
PS: My current VM need about 90GB of RAM now (tested on HP server with 256GB ECC). I could work on reducing the amount of RAM but if hardware is not a problem I could be in with 128GB per PCEdited by sblantipodi - 8/24/16 at 1:44pm