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Is my ASRock X99 Motherboard preventing overclocking?

post #1 of 4
Thread Starter 
Need some advice ... first, the system in question; ASRock X99 Extreme6/AC, i7 5930K, NZXT X61 AIO watercooling (CPU only), G Skill Ripjaws DDR4 2400 (16 GB) (15-15-15-35), EVGA GTX 980 Ti Classified, Corsair HX 750i Platinum, Samsung 850 EVO 250 GB, Samsung 850 EVO 500 GB, Win 7 Pro. Benchmark software used - pretty much all of them ... Prime 95, AIDA64, Valley, Heaven, Cinebench and a few more.

Background - I built the system in January 2015, it's a beast ... the only issue I've had in a year and a half is occasionally if a peripheral (some but not all devices cause this ... for example my Thrustmaster Warthog HOTAS will cause this anomaly) is plugged into USB the system will post but not boot. Aside from that smooth sailing.

The issue - after "system break in I got straight to overclocking the 5930K. After many tries with both ASRock provided OC profiles (tried both UEFI and ASRock Atuning which I know are essentially the same thing). The only, and I do mean only, overclock that the CPU will tolerate is the built in 4.0 GB profile. No other symptoms at all (ie CPU temp was always perfect etc ...). Any attempt beyond this results in the usual failure modes, mostly system hang. At this point I just assumed that I lost the silicon lottery and didn't give it a second thought.

Next, I attempted to overclock my original GPU, which was an EVGA GTX 970 SSC ... same result, would not tolerate any OC at all, same failure modes, absolutely no secondary symptoms at all. Here I used both the EVGA utility and MSI Afterburner. At this point I'm a little suspicious but essentially accepted that it's totally possible that both the CPU and GPU are under achievers.

Last, I upgraded my GPU to the EVGA GTX 980 Ti Classified and after many attempts it would not tolerate any OC at all. As with all previous attempts all other parameters (temp etc ...) are perfect. At this point I'm really suspicious and thinking that something else might be wrong. I investigated the RAM ... no problems there, I have Corsair's utility ... power supply is always right in the sweet spot. Leaving the X99 Extreme6/AC as the only remaining suspect.

The question - does is seem unusual to anyone that all 3 components failed to OC? Has anyone experienced, and resolved a similar issue? Is there a way to test the MoBo? Other than this OC situation I've had no problems beyond the USB issue above.

Any insight would be much appreciated
post #2 of 4
I would suspect both the power supply and the motherboard. That bad of overclocking on all three components does seem odd but I would think the system would be unstable during stress testing if it was a normal bad motherboard.

When really weird things like this happen I suspect power supply until it does it with another one... then I suspect the motherboard. tongue.gif
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Desktop
(19 items)
 
RAID
(17 items)
 
 
CPUMotherboardGraphicsRAM
Intel i9-7900X @ 4.7GHz Asus ROG Rampage VI Apex Titan X (Pascal) @ 2.05GHz 32GB DDR4 4000-17-17-17-37 CR1 
Hard DriveHard DriveCoolingOS
480GB - Intel Optane 900P 2TB - Samsung 960 Pro EK Monoblock + GPU + 560 Rad Windows 10 Pro x64 
MonitorMonitorMonitorKeyboard
Acer XB270HU bprz HTC Vive LG OLED55C7P Logitech G810 
PowerCaseMouseMouse Pad
Seasonic PRIME 1200 Platinum Old Marble Slab Logitech G900 Logitech G440 
AudioAudioOther
Sennheiser HD 600 Creative SoundBlasterX AE-5 Mellanox ConnectX-3 MCX312A-XCBT 10 GbE Adapter 
CPUMotherboardGraphicsRAM
i7-5960X @ 4.2GHz Asus Rampage 5 Extreme Nvidia GeForce GT 545 32GB DDR4 (2400-12-12-12-28-1T) 
Hard DriveHard DriveHard DriveOptical Drive
Samsung 950 Pro M.2 512GB HGST NAS 4TB x8 - 21.8TB RAID6 Western Digital Black 4TB Samsung SH-S183L 
CoolingOSMonitorKeyboard
Noctua NH-D15 Windows 10 Pro Asus VG278H WASD "CODE" Keyboard 
PowerCaseMouseOther
SeaSonic Platinum-1000 DIYPC Alpha-GT3 Logitech G700s Mellanox ConnectX-3 MCX312A-XCBT 10 GbE Adapter 
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post #3 of 4
Thread Starter 
Thanks Asmodian ... much appreciated. I had not really considered the PSU but it makes sense (or at least its the easier of the two possibilities to correct). The 12 phase power and premium caps, chokes etc ... and the rest of the "overclock ready" features are the things that attracted me to the Extreme6 so while it is still possibly the culprit it doesn't seem likely.

I'll get my hands on a new PSU and if it turns out not to be the problem it couldn't hurt to have a spare lying around. I'll post results here.
post #4 of 4
Thread Starter 
Update - I did remove my Corsair HX750i and replaced it with a new HX1000i. There was no change in behavior ... in fact the CPU and GPU both failed to overclock in the exact way as with the previous PSU, with only the 5930K accepting the XMP profile baked into the UEFI and the GTX 980Ti Classified locking up at any OC attempt. It was worth a try. I also made sure that my memory is ASRock supported and I do have the latest stable (not beta) bios.

So, I think it boils down to one of two things ... either I was very unlucky in the silicone lottery or something else is responsible.

2 questions;

Is there any MoBo test that might reveal a problem? I understand that swapping in different CPU and GPU would be interesting but I don't have access to either (unless I grab an inexpensive Xeon from eBay which does not seem productive).

Is there anything else besides mobo, CPU, GPU that could be at fault?

Thanks
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