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 2016-02-29, 03:03 #67 Prime95 P90 years forever!     Aug 2002 Yeehaw, FL 7,351 Posts Grrrrr..... the troubles begin The H110 CPU which ran fine for 5 or so days is now experiencing hangs. Unfortunately, 3 things have changed since that period of stability. 1) Switched to network boot and NFS storage. 2) Undervolting CPU by 35mV. and 3) Undervolting RAM to 1.2V. So one of those changes is causing instability (or I was just lucky in avoiding the hang for 5 days). The Z170 system has not experienced any problems (yet) with the CPU undervolted by 40mV. The good news is the two CPUs returned 3 matching DCs. Now the painful process of isolating the cause.....
 2016-02-29, 14:21 #68 Fred     "Ron" Jan 2016 Fitchburg, MA 97 Posts George, I was just looking at mobo options again. I hadn't realized that not all Micro-ATX boards are the same size. In particular, I noticed that the ASRock H110M-DGS (Micro-ATX) is only about 3/4 of an inch bigger than the ASRock H110M-ITX (the board I believe we've both been buying lately). The Micro-ATX version though is running about $20 cheaper on Newegg. I'm curious though if in fact there is any power difference. I'll probably order one soon and let you know. PS. Good luck with the troubleshooting on the H110. My H110 hasn't had any issues yet, but I haven't done any voltage adjustments either (except for allowing the NonZ OC to make the RAM adjustment, I didn't over-ride that). Last fiddled with by Fred on 2016-02-29 at 14:26 2016-03-13, 13:38 #69 Fred "Ron" Jan 2016 Fitchburg, MA 97 Posts Quote:  Originally Posted by Fred George, I was just looking at mobo options again. I hadn't realized that not all Micro-ATX boards are the same size. In particular, I noticed that the ASRock H110M-DGS (Micro-ATX) is only about 3/4 of an inch bigger than the ASRock H110M-ITX (the board I believe we've both been buying lately). The Micro-ATX version though is running about$20 cheaper on Newegg. I'm curious though if in fact there is any power difference. I'll probably order one soon and let you know.
Yikes, ignore that advice. Ordered one to try. Yes, it's only about a 1/2" bigger, and \$20 cheaper up front, but it does in fact use 9 to 10 additional watts. What it's doing with that energy is beyond me, but, there it is. Two side by systems.

Both Systems: CX430M Bronze PSU, non-z oc enabled (sport+), no manual tweaking of voltages, 4x8 gskill nt ddr4-2133, i5-6500.

System A) ASRock H110M-ITX : 74w
System B) ASRock H110M-DGS : 83.5w

Back to the H110M-ITX for me.

Last fiddled with by Fred on 2016-03-13 at 13:39

2016-03-13, 16:25   #70
Prime95
P90 years forever!

Aug 2002
Yeehaw, FL

7,351 Posts

Quote:
 Originally Posted by Prime95 Now the painful process of isolating the cause.....
Hopeful news, twelve days of stability by undervolting the h110 by 30mw. The z170 is still happy undervolting by 40mw.

I should have all the parts to add three more CPUs on Wednesday.

 2016-03-13, 19:25 #71 Mark Rose     "/X\(‘-‘)/X\" Jan 2013 B7116 Posts This is making my itch to build a cluster stronger.
2016-03-13, 19:29   #72
Fred

"Ron"
Jan 2016
Fitchburg, MA

97 Posts

Quote:
 Originally Posted by Prime95 I should have all the parts to add three more CPUs on Wednesday.
Do you have a target total number of boards?

 2016-03-13, 20:24 #73 Mark Rose     "/X\(‘-‘)/X\" Jan 2013 55618 Posts George, how are you connecting the PicoPSUs to the Platinum power supply? Cutting wires? Or have you found an adapter?
2016-03-13, 20:45   #74
Prime95
P90 years forever!

Aug 2002
Yeehaw, FL

7,351 Posts

Quote:
 Originally Posted by Mark Rose George, how are you connecting the PicoPSUs to the Platinum power supply? Cutting wires? Or have you found an adapter?
I've ordered this: http://www.ebay.com/itm/262321746827

They have not arrived yet, so I cannot vouch for them.

2016-03-13, 20:48   #75
Prime95
P90 years forever!

Aug 2002
Yeehaw, FL

7,351 Posts

Quote:
 Originally Posted by Fred Do you have a target total number of boards?
5-7 will fit in my case and stay reasonably close to the optimal 50% PSU usage.

I'm going to start with five, install case fans, close it up and monitor temps before adding anymore CPUs.

2016-03-13, 20:48   #76
Mark Rose

"/X\(‘-‘)/X\"
Jan 2013

55618 Posts

Quote:
 Originally Posted by Prime95 I've ordered this: http://www.ebay.com/itm/262321746827 They have not arrived yet, so I cannot vouch for them.
Interesting!

Do double check the pin outs on the power supply before plugging everything in: I've heard manufacturers aren't consistent even within their own products (such as Corsair).

Edit: I mean to say the plugs on the power supply itself, not the plugs that would plug into a graphics card.

Last fiddled with by Mark Rose on 2016-03-13 at 20:53

 2016-03-17, 21:25 #77 Prime95 P90 years forever!     Aug 2002 Yeehaw, FL 11100101101112 Posts Update: Third CPU up and running. This is another Asrock HTX-110 mobo, with i5-6500, memory OCed to "Sport+", RAM voltage at 1.2V, CPU undervolted by 40mV. Two hours of 4 thread torture test OK. Total watts at the wall increased 57W using a 92% efficient CPU. Started a 1 worker, 4 thread DC, hangs quickly. Tried -30mV, used 58W, still hung fairly quickly. Tried -20mV, used 59W, hung after a little while. I found this odd since a torture test ran 2 hours at -40mV. I wondered if the OS/CPU is trying to enter a lower voltage state when an auxiliary thread goes idle for a short period. i7z indicates that the CPU is entering a C1 state occasionally. So,.... I disabled C states in the BIOS, reverted to -30mV, and am now at 18 hours without a hang. At some point, I'll try -40mV again and if successful also try -40mV on the other H110 mobo.

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