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ASUS X99 Motherboard Series - Official Support Thread (North American users only) - Page 985

post #9841 of 15864
Well, the PSU is only a month old, EVGA 850w G2. However I will be RMAing it because the fan startled rattling in it, dammit.

Doubtful the PSU could cause that though, imo.
post #9842 of 15864
Thread Starter 
Quote:
Originally Posted by Tephnos View Post

Even if so, if I upgrade to quad channel, this might put that dead in its tracks if I can't find the cause.

If you want to upgrade to quad channel, then best bet is to buy a quad channel kit rather than combining two of those kits. Likelihood is that those modules don't have much margin and the two channels that are subject to a bit more noise are leading to instability. This can probably be dialled out with an increase in associated voltages or relaxed memory timings.
post #9843 of 15864
Quote:
Originally Posted by Raja@ASUS View Post

If you want to upgrade to quad channel, then best bet is to buy a quad channel kit rather than combining two of those kits. Likelihood is that those modules don't have much margin and the two channels that are subject to a bit more noise are leading to instability. This can probably be dialled out with an increase in associated voltages or relaxed memory timings.

Yeah, I wouldn't have kept the same modules, that's for sure.

Can you explain why they work perfectly in A1/C1 then without touching anything, but B1/D1 is unstable, if it is due to bad margins in the modules? Is it really likely that noise would only hit those two?
post #9844 of 15864
Thread Starter 
Quote:
Originally Posted by Tephnos View Post

Yeah, I wouldn't have kept the same modules, that's for sure.

Can you explain why they work perfectly in A1/C1 then without touching anything, but B1/D1 is unstable, if it is due to bad margins in the modules? Is it really likely that noise would only hit those two?

What I am referring to is electrical noise. Each DIMM slot is subject to varying levels depending upon layout and neighboring components.
post #9845 of 15864
Quote:
Originally Posted by Raja@ASUS View Post

What I am referring to is electrical noise. Each DIMM slot is subject to varying levels depending upon layout and neighboring components.

Interesting that two different boards would exhibit the same electrical noise interference, don't you think? In terms of other components, it is pretty barebones, just a GPU.
post #9846 of 15864
Thread Starter 
You are misunderstanding what I am referring to. There is always some low level electrical noise present on signal lines. This requires a basic understanding of electronics to grasp, so do not worry if you don't understand it.
post #9847 of 15864
Quote:
Originally Posted by Raja@ASUS View Post

You are misunderstanding what I am referring to. There is always some low level electrical noise present on signal lines. This requires a basic understanding of electronics to grasp, so do not worry if you don't understand it.

Oh, I understand it alright, It's just that I just woke up and am wondering if you're referring to the modules themselves being the cause, or the slots, from your post. tongue.gif
post #9848 of 15864
Thread Starter 
Quote:
Originally Posted by Tephnos View Post

Oh, I understand it alright, It's just that I just woke up and am wondering if you're referring to the modules themselves being the cause, or the slots, from your post. tongue.gif

If you understand it, then this question would not arise.
post #9849 of 15864
Well, you say that, but I'm perfectly capable of understanding that electrical components exhibit low levels of noise on signal lines. Having reread your posts, what I get from it is: "Those two channels, B1/D1, are subject to more noise than the others, due to board layout and so on, and it looks like the modules don't have much tolerance for that." Correct?

I did do some googling to see if you were right, and I'm seeing a number of posts with people having similar issues, where playing with the voltages/timings did absolutely nothing. Interesting.
post #9850 of 15864
Thread Starter 
The penny drops.

If each slot sees a module on its own then the instability can be dialled out.
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