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ASUS X99 Motherboard Series - Official Support Thread (North American users only) - Page 1337

post #13361 of 15863
Quote:
Originally Posted by KedarWolf View Post

By the way, peeps. with a Sabertooth X99 you can't use two GPUs, an x4 PCI-E SSD and an x4 M.2. The M.2 disables the third x16 slot and the smaller X4 will only work at x2 for your x4 PCI-E SSD. You can't use a x4 PCI-E at x4 in the PCI-E_4 slot no matter how you set it up, it's x2 max. frown.gif

My X99-A II the x4 slot WILL work at x4 with the same setup if I disable the USB 3.1 and don't use the PCI-E x1 slot. smile.gif

Hello

This info is stated in both the board's specifications and user manual as well.
post #13362 of 15863
Quote:
Originally Posted by Praz View Post

Hello

This info is stated in both the board's specifications and user manual as well.

Yes Praz, I know, but some may overlook it, I know I missed that when I bought the board. And I'm referring specifically to a dual GPU, x4 PCI-E with M.2 setup. Or just the fact some might not realize the x4 will not run at x4. Is really easy to miss. rolleyes.gif
    
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post #13363 of 15863
Quote:
Originally Posted by KedarWolf View Post

Quote:
Originally Posted by Praz View Post

Hello

This info is stated in both the board's specifications and user manual as well.

Yes Praz, I know, but some may overlook it, I know I missed that when I bought the board. And I'm referring specifically to a dual GPU, x4 PCI-E with M.2 setup. Or just the fact some might not realize the x4 will not run at x4. Is really easy to miss. rolleyes.gif


Not everyone Downloads the Manual before Buying , and the Specs don't always tell you everything either , eg the fact that the Strix does RAID ..... it's why I have the X99A II now instead, so the more info out there the better.

.
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post #13364 of 15863
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Originally Posted by Desolutional View Post

Only the speed by Intel is rated. The Skylake-E processors are all rated up to 2400MHz DDR4 JEDEC spec. Anything higher depends on the quality of the IMC (CPU's memory controller), the quality of the motherboard's memory traces and how the RAM was tested. XMP is not a guarantee for overclocking, but it gives you a pretty good idea of what the average processor will be able to handle. Case in point, my kit works at 3200MHz on another persons' Haswell-E chip, but can only go up to 2667MHz on my setup. In that case it's the IMC. If the kit is underperforming on more than one similar setup, then chances are, it is the kit. Anything above 2400MHz in JEDEC based spec scales very weakly in games, except those heavily hampered by CPU bottlenecks (Fallout 4, Arma, etc.). Lowering timings at higher frequencies may or may not increase performance, extreme tech did not test the effect of user edited timings, only motherboard Auto rules.

Sources:
http://www.extremetech.com/extreme/198894-raming-speed-does-boosting-ddr4-to-3200mhz-improve-overall-performance

so skylake-e could use memory module at 1.0V for example.
I would like to buy 256GB of RAM starting from 3000MHz depending on what I found in shops, those RAM will be rated at 1.35V,
can I be sure that I will be able to use those RAM on Skylake-E?
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post #13365 of 15863
Quote:
Originally Posted by sblantipodi View Post

so skylake-e could use memory module at 1.0V for example.
I would like to buy 256GB of RAM starting from 3000MHz depending on what I found in shops, those RAM will be rated at 1.35V,
can I be sure that I will be able to use those RAM on Skylake-E?

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.
Edited by Desolutional - 8/24/16 at 1:26pm
post #13366 of 15863
Quote:
Originally Posted by Desolutional View Post

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 PC
Edited by sblantipodi - 8/24/16 at 1:44pm
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post #13367 of 15863
Skylake-E is perfectly fine running DDR4 at 1.35V, just make sure to check that any 128GB kit you buy is on the QVL tested list on ASUS' website.
post #13368 of 15863
Quote:
Originally Posted by Desolutional View Post

just make sure to check that any 128GB kit you buy is on the QVL tested list on ASUS' website.

I really appreciate your help Desolutional, thanks.
I can't check the QVL list on Asus website since Skylake-E has not been released yet. tongue.gif
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post #13369 of 15863
Quote:
Originally Posted by Desolutional View Post

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.

My double sided Corsair LPX 128GB 3000MHZ kit really struggles to to 300 on the 125 strap and won't do 3200 at all on the 100 strap. Single sided RAM does 3200 fine.

But it does do 2666MHZ with great timings of 12-12-12-27 1T tREFI 22066 and using the 1866MHZ secondary and third timings and a few other performance related tweaks. biggrin.gif
    
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post #13370 of 15863
Quote:
Originally Posted by mbze430 View Post

Don't know what to tell you then, because I was having the EXACT problem, and uninstalled the top one, and installed the 2nd one... and it fixed the problem.

I cleared the CMOS then installed the version that you did, and it's working now. Since I'm using a strix 1080 as well, I kind of want to try the newest version but at the same time I don't. I guess I could try the standalone VGA one.
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