HiRecently I have had freezes together with a loud buzzing sound. I recently (start of July 2011) upgraded my computer with an Intel 2600K, Corsair H70 cooler and a Gigabyte GA-Z68X-UD4-B3 motherboard. I already had a Corsair 750 watt power supply (fitted Dec 2010), Nvidia GeForce GTX280, 8Gb of ram(matched 4Gb pair Corsair DDR3 1666Mhz). Windows Home professional 64bit. Over the last couple of days the freeze has occured when flying both the MD11 and the 737NGX. After a while I get a blue screen with the same string of numbers mainly groups of zeros with the following group of numbers in the middle "oxFFFFF88002F6DC70" and below this I have the following message "Dump physical memory to disc 70" this number increases in steps of 10 and then stops at 70. I have the processor O/C to 4.2GHz. I tried to get to 4.4GHz but I had the dreaded blue screen when I tried to run FSX. I then reduced the processor back to 4.2GHz. Currently I have the following setting on my CMOS Set up utility Advanced CPU Core FeaturesCPU Multi Threading [Enabled]CPU Enhanced Halt (CIE) [Enabled]C3/C6 State Support [Enabled]CPU Thermal Monitor [Enabled]CPU EIST Function [Enabled]. I didn't change the above when I O/Ced to 4.4 Ghz. But am wondering if they may change automatically? The freeze and noise first happened with the 737NGX after installing Hotfix 3. I rang up the people who made and also upgraded my computer as I thought it must be a hardware fault. They told me that it was due to the NGX and it was not a hardware fault. I went a week of flying the NGX before it happened again and then a futher period of five days elapsed before yesterday it happened again with the NGX and twice today with the MD11. As it has happened 3 times in 24 hours am now concerned ! My knowledge of computers is poor and what little I have learnt is so that I can run FSX. I have followed all the steps in the NGX tutorial and have the HIGHMEMFIX =1 in my FSX config file. I also told the computer company that I was surprised that I failed to O/C to 4.4GHz but they said that 4.2 was the max. I found that answer strange as I have seen many posters on the PMDG forums state that they have O/Ced up to a max of 5GHz. So in summary are my CMOS settings wrong or is the problem elsewhere? I look forward to hopefully hearing the views of those on this forum who are more knowledgeable about computers than me. Thanks in anticipation

The oc part could be true. I remember an intel guy saying that durIng testing only 50% could go beyond 4.4-4.5ghz & 10% can make it to >4.8. Of the 3 I've played with, the first 2600k capped out at 4.3 & the 2500k got up to 4.6ghz. I haven't oc'ed the second 2600k yet.What voltage is your ram & what is te voltage set at? Sandybridge doesn't like anything over 1.65v & prefers 1.5v ram.

Pure and simple, it sounds like you have some nagging overclock induced instability. These issues can crop up "randomly" with an unstable PC. On another note, with an H70 cooler and a 2600k, 4.2 is much less than I would expect, but I wouldn't expect the builder to say that to you and I'm sure you're doing something wrong... You're going to have to check your Vcore settings, and I would consider disabling hyper threading if you don't use programs that utilize it. I highly recommend you learn what you are doing before you mess around with the BIOS. You could break something!

The oc part could be true. I remember an intel guy saying that durIng testing only 50% could go beyond 4.4-4.5ghz & 10% can make it to >4.8. Of the 3 I've played with, the first 2600k capped out at 4.3 & the 2500k got up to 4.6ghz. I haven't oc'ed the second 2600k yet. What voltage is your ram & what is te voltage set at? Sandybridge doesn't like anything over 1.65v & prefers 1.5v ram.

My CPU Vcore voltage is 1.345v. I have now disabled all the things I mentioned were enabled on my first post. I now remember that they were originally disabled by the people who did the upgrade. I guess I changed them when I tried to O/C to 4.4GHz. Following Zach,s advice to find out more I have found the following on the web "Overclocking for a newbie" and that recommended disabling those settings. Now going to fly the NGX from Maderia to Newcastle UK. Thanks both for your replies.

My CPU Vcore voltage is 1.345v. I ha:ve now disabled all the things I mentioned were enabled on my first post. I now remember that they were originally disabled by the people who did the upgrade. I guess I changed them when I tried to O/C to 4.4GHz. Following Zach,s advice to find out more I have found the following on the web "Overclocking for a newbie" and that recommended disabling those settings. Now going to fly the NGX from Maderia to Newcastle UK. Thanks both for your replies.

Great! Good luck