When in flight with FSX, usually within 20 to 40 minutes, pc reboots itself when using these settings:AI Overclock Tuner: ManualBLCK Freq: 100.00Turbo Ratio: Enabled (All Cores)By All Cores: 48Internal PLL OverVoltage: EnabledMem Freq: 1600 mhzEPU Power Saving: DisabledLoad-Line Calibration: HighVRM Freq: Manual Set to 350Phase Control: ExtremeDuty Contorl: ExtremeCPU Current Capability: 100%CPU OverVoltage: Offset ModeCPU Offset: + 0.060DRAM Voltage: 1.65VCCSA Voltage: Auto VCCIO Voltage: Auto CPU PLL Voltage: Auto PCH Voltage: AutoCPU Spread Spectrum: DisabledCPU Ratio: AutoIntel Adaptive Thermal Monitor: EnabledIntel Virtualization: DisabledIntel SpeedStep: EnabledTurbo Mode: EnabledCPU C1E, C3, C6: Enabled I also tried CPU voltage at manual with 1.44 volts just to make sure, same problem...When i leave it at Asus's optimized default settings with Turbo (@ 3.8)no HT, everything is fine...What am I doing wrong ?Any ideas ? see specs in sig.Thanks in advance !Aalin from Montreal

Whoa, not nearly enough Vcore judging by the offset for those 4800mhz. You are probably trying to run Vcore around 1.2 for 4800mhz. No wonder it crashes.Did you even read enough articles on overclocking? I noticed you just put everything to extreme and some forum suggestions and went with that...Start here:http://www.overclock.net/intel-general/910467-ultimate-sandy-bridge-oc-guide-p67a.html

Nail on the head Word Not Allowed. I suggest you do a bit more research before you break something, Aalin! Running everything at extreme/high isn't necessary (like load line calibration).

More specific to your board: http://hardforum.com/showthread.php?t=1578110

Thank you all for responding;I followed instructions from someone on this forum with this result... i am not to good at this, i managed to follow a template for my other machine, the I7-920, with sucess and tought it would be as easy with this new mb...I will follow the links and try to learn a bit... :Thinking: Alain from Montreal

Maybe I'm missing something, but I don't exactly see any inherent problems with those BIOS settings.With the settings posted above, what is your CPU voltage while running prime95? I'm willing to bet you need to set LLC to ultra high. At 4.8GHz, offset of +0.04v, and LLC @ ultra high, I get 1.40v exactly at 100% load. If your chip is thirsty for voltage, though, it may very well take 1.40 to 1.44v to run a stable 4.8GHz. Also, just because you manually set 1.44v in the BIOS, doesn't mean your chip actually gets 1.44v. Due to vdroop, you will generally see less than what you set in the BIOS when your CPU is at 100% load. That's where LLC comes in, to compensate for vdroop. LLC set to high may not be enough compensation, so try ultra high. Too much LLC will actually overshoot the voltage. I wouldn't suggest extreme.Finally, I wouldn't suggest running more than 1.40v through these chips. Everyone has their own personal limit (1.35, 1.38, 1.4, 1.52, etc), but 1.40v is mine.Have you done any stability testing with Prime95? If not, download it and run the blend setting. I would aim for 2hrs stability minimum. Personally, I ran it for 8. But don't let temps go above 75C or 80C of course while doing that. RealTemp is a great program for monitoring temperature.Download summary:CPU-Z to check voltagePrime95 to stress test (use the blend setting)RealTemp to monitor temperatures

have it stable at 4.5 - 4.6 and work your way up from there

With the settings posted above, what is your CPU voltage while running prime95? I'm willing to bet you need to set LLC to ultra high. At 4.8GHz, offset of +0.04v, and LLC @ ultra high, I get 1.40v exactly at 100% load. If your chip is thirsty for voltage, though, it may very well take 1.40 to 1.44v to run a stable 4.8GHz.

Please recheck that offset. I'm running offset 0.27, and it drops down to 1.25 from 1.52. It would mean your idle voltage is 1.36. Are you sure?? Or is the LLC overshooting the offset voltage THAT much that 0.04 is enough??

Also, just because you manually set 1.44v in the BIOS, doesn't mean your chip actually gets 1.44v. Due to vdroop, you will generally see less than what you set in the BIOS when your CPU is at 100% load. That's where LLC comes in, to compensate for vdroop. LLC set to high may not be enough compensation, so try ultra high. Too much LLC will actually overshoot the voltage. I wouldn't suggest extreme.

I found out that my overclocks are massively unstable with LLC High/Ultra High. Regular is what I'm going with and I have no Vdroop. It's interesting that my board actually produces no Vdroop with Regular, at all...I think every board is different and each one has to find AND understand what it does and then how it impacts stability on their system.The "may not be" is very vague statement. I think some checking over with CPU-Z and calculating voltages is needed here.Extreme has been too much in any case for me.

Finally, I wouldn't suggest running more than 1.40v through these chips. Everyone has their own personal limit (1.35, 1.38, 1.4, 1.52, etc), but 1.40v is mine.

Everyone has to decide for themselves here. It's all about how ready you are about destroying your chip...

Have you done any stability testing with Prime95? If not, download it and run the blend setting. I would aim for 2hrs stability minimum. Personally, I ran it for 8. But don't let temps go above 75C or 80C of course while doing that. RealTemp is a great program for monitoring temperature.

My favourites:Prime95: 15 hours at leastLinx: 200 runs 4096 memory, ran twiceMemtest: one night (about 8 hours)Temperature: max 80c.If it holds out at that, it's stable is my opinion. And FSX is never gonna push it up ot 80c.Good luck!

Thank you all for responding;I followed instructions from someone on this forum with this result... i am not to good at this, i managed to follow a template for my other machine, the I7-920, with sucess and tought it would be as easy with this new mb...I will follow the links and try to learn a bit... :Thinking: Alain from Montreal

Hi AlainYour offset is a bit too low for 4.8 Ghz. I needed 0.085 offset for 4.8Ghz with LLC high. Gives about 1.4v on the chip with Prime95. Either that or go down to 4.7Ghz. I dont think you will see any difference in FSX. A third option may be to turn of HT but check the chip volts arent too high as a consequence.

Please recheck that offset. I'm running offset 0.27, and it drops down to 1.25 from 1.52. It would mean your idle voltage is 1.36. Are you sure?? Or is the LLC overshooting the offset voltage THAT much that 0.04 is enough??

Word Not Allowed,One of us isn't quite sure how offset mode works, so I'll explain it as I understand it. Basically, all you're doing with offset mode is adding the offset voltage you specify in the BIOS to your processor's Voltage Identification (VID). That's the easy part... however, VID increases as you increase your CPU's multiplier and just to make things complicated, every processor's VID is different. Think of VID as a table of default voltages. It's basically there so that when you have the voltage set to auto and you overclock your CPU to 4.5GHz, for example, it can look in the table and find the default voltage required to run 4.5GHz. This table is created when the chip is manufactured and you can't change it. I presume it's created by stress testing the chip at the factory. Generally speaking, better clocking chips tend to have lower VID. But I have read somewhere that lower VID chips also tend to run hotter.So here's a little exercise based on my system's current settings:At 4.8GHz and 100% load, my VID is 1.3661v as seen in the images below. With my current BIOS settings of +0.04v offset and LLC set to ultra high, my CPU voltage fluctuates between 1.400v and 1.408v while running prime95. For the coming math, let's average that to 1.404v. So while I'm seeing 1.404v in CPU-Z, my VID + offset (1.3661v + 0.04v) = 1.4061v. Vdroop is the difference between the actual voltage reported by CPU-Z and the voltage my processor should be seeing. So in this case, my vdroop is 1.4061 - 1.404, or 0.0021v. That's practically nothing! Bear in mind that the above was all done at 100% load. And not just 5 minutes into prime95, more like an hour+.Regarding my idle voltage, it varies, but mostly fluctuates between 0.992v and 1.104v. Of course, that's while the CPU is running at 1.6GHz.You can find your VID by looking at RealTemp 3.67 as seen in the images below. I think you will find that you're compensating for your lower LLC setting by the increased offset. In other words, your experiencing vdroop, but rather than eliminate it with a higher LLC setting, you're using a higher offset to overcome it. Neither method is wrong, though. However, vdroop only really occurs at high CPU load, so your idle voltage is going to be much higher. Lots of Sandy Bridgers have had issues with idle stability and I think lower LLC and higher offset has solved the issue for many. So just to be clear, I'm not trying to say your method is wrong, it's just a different means to stability. It just goes to show that overclocking SB is a little more complicated than simply upping the multi. The people who hate on SB for being too "easy" are just plain ridiculous.Regarding differences in motherboards, I don't know if that's actually true. Many many many ASUS mobo ownsers and reviewers have said that Ultra High LLC more or less eliminates any vdroop. The differences you're talking about are probably actually coming from the differences in VID, which is strictly CPU related.

On second thought, 0.27v is a huge offset, Word Not Allowed. Even for LLC set to high. What does CPU-Z report for voltage while you're running prime95?

On second thought, 0.27v is a huge offset, Word Not Allowed. Even for LLC set to high. What does CPU-Z report for voltage while you're running prime95?

1.52. Everything below is unstable with "not enough vcore" blue screens.All what you said sounds very right to me. I also understand it like that.My LLC is at regular. Or zero.I thought it was because of high LLC on your computer that you need so little offset to get the right Vcore.In the beginning I was experimenting with both, high and low LLC, and found much better stability with low LLC. Right now after couple of BIOS updates, I might test it with high LLC, as it gives cooler CPU when at idle.Only thing I don't completely understand is why is your idle so low. Is offset also impacting the idle Vcore? I possibly misunderstood offset alone a bit, meaning it's an offset that is used for upping the vcore on load. Basically, it is, without LLC.EDIT:Ran quick test:Very High LLC + Offset 0.15 = 1.52 Vcore in CPUZ under Prime95Stopped P95After 2 seconds, freeze and BSOD 0x00...101 (vcore)Back to regular LLC + 0.26 (not 0.27).