Prime95 keeps my system from freezing - idling problem?

I've built a new rig for 10.9 and did a clean install according to common guides. However - after a short time (2-15 minutes) my system completely freezes. No beach ball. No kernel panic. Everything just grinds to a halt but stays visible on my screens.

Installation procedure

• http://www.tonymacx86.com/374-unibeast-install-os-x-mavericks-any-supported-intel-based-pc.html
• http://www.tonymacx86.com/golden-bu...ell-matx-ga-z87mx-d3h-i7-4770k-hd-4600-a.html

Hardware

• Gigabyte GA-Z87MX-D3H (f5)
• Core i7 4770K
• PSU Corsair HX 650W 80+
• Corsair 16GB (4-KIT) DDR3 Vengeance XMP 1,3 1,5V
• SSD 240GB Corsair SATA 2.5", Force 3 Series
• 2x 2TB Seagate SATA-600 Green ST2000DL003

I've tried the following

• Running a bare minimum system. No HDs. No front USB connector. One monitor.
• Upgraded to latest FakeSMC using Kozleks HWSensors
• Downgraded AppleIntelE1000e.kext to hnaks's 2.4.14 using Multibeast 5.4.0.
• My Corsair HX 650W (bronze) might not be Haswell compatible according to Corsair, so I disabled C6/C7 (and C3) states in the Bios.
• I disabled C-States followed by P-States in org.chameleon.Boot.plist.

After each single step I've tried running my system, but never succeeded for more than a maximum of 15 minutes. It just hangs. Resulting in no other option than to hard reset.

When I've been running Prime95 (http://www.mersenne.org/freesoft/) I've noticed that the system does not crash. For the most I've ran it over night and woke up to a running system.

Could it be that somehow it crashes when the CPU has too little to do? Why? How could I remedy it?

I'd love to get some experienced help. Cheers! // Mikael

ps. The problem is described in this thread as well, but I started this new one since it seems I narrowed the problem down to this "idling" issue. http://www.tonymacx86.com/general-help/114630-fresh-ga-z87mx-d3h-4770k-10-9-hangs-no-kp.html

[Edit] By the way - the system runs fine booting into Windows 7 64 bit.

Try increasing the memory voltage by .1. I increased mine from 1.5 to 1.6 and was able to run w/o it freezing. Give that a try.

baller1308 said:

Try increasing the memory voltage by .1. I increased mine from 1.5 to 1.6 and was able to run w/o it freezing. Give that a try.

Click to expand...

Thanks for the suggestion. I've never done any overclocking at all. Under what menu in Uefi/BIOS should I look for that setting? Are there any possible side effects?

[edit] Found it. Trying. Testing.

Cheers! //Mikael

I tried upping the RAM voltage to 1.6 and then 1.65V. In both cases the system hung just as before. Guess that wasn't it on my system.

I'm attaching two screen captures from HW Monitor. One where the CPU runs at 3.5GHz and one at 800MHz. I don't really know what to make of the different numbers. Maybe someone else does.

Still greatly thankful for anyone trying to help me out.

Cheers,
/Mikael

I was hoping that Multibeast 6.0.1 would magically remedy my problems. But, no. I still get a frozen system within minutes of booting.

Would still love help and suggestions.

Cheers, people!
/Mikael