ok, here are my specsI7-930 2.8ghz o/c to 4.0 ghz 1.336corsair water cooled6Gigs of high speed memory (DDR3 1600)EVGA Geforce GTX 470P6TD Deluxe moboWindows 7 home premium 64 bitmy question is, I am thinking of increasing my mutilplyer to 21 giving me 4.2 ghz but what about my voltage? what do I do with this?

ok, here are my specsI7-930 2.8ghz o/c to 4.0 ghz 1.336corsair water cooled6Gigs of high speed memory (DDR3 1600)EVGA Geforce GTX 470P6TD Deluxe moboWindows 7 home premium 64 bitmy question is, I am thinking of increasing my mutilplyer to 21 giving me 4.2 ghz but what about my voltage? what do I do with this?

It will be helpful if you included a bios 'template' that includes the variables you changed. The multiplier determines the clock frequency. (CPU multiplier X BCLK (Base Clock)). Here is an excellent tutorial on the I core structure. http://vip.asus.com/forum/view.aspx?board_...SLanguage=en-us

With a BCLK of 200 and a multi of 21 (4.2GHz) my voltages are:CPU Voltage: 1.32500CPU PLL Voltage: 1.82QPI/DRAM Core Voltage: 1.34375IOH Voltage: 1.20ICH Voltage: 1.20DRAM Bus Voltage: 1.66I choose a BCLK of 200 because that will run my ram at 1600MHz and that is what the ram is speced at.As far as voltages, this is something that you really just have to try and see if it is stable, just make sure that you do not go over the safe level. For a OC of 4GHz 1.336 seems kind of high to me, but with your hardware it may have to be at 1.336 to be stable.

With a BCLK of 200 and a multi of 21 (4.2GHz) my voltages are:CPU Voltage: 1.32500CPU PLL Voltage: 1.82QPI/DRAM Core Voltage: 1.34375IOH Voltage: 1.20ICH Voltage: 1.20DRAM Bus Voltage: 1.66I choose a BCLK of 200 because that will run my ram at 1600MHz and that is what the ram is speced at.As far as voltages, this is something that you really just have to try and see if it is stable, just make sure that you do not go over the safe level. For a OC of 4GHz 1.336 seems kind of high to me, but with your hardware it may have to be at 1.336 to be stable.

so then, kind of what you are saying is, try it and if things start to go whacky either crank up the volts or go back down to 4ghz

so then, kind of what you are saying is, try it and if things start to go whacky either crank up the volts or go back down to 4ghz

Keep a close eye on your CPU temps. The Core I7 series generate a lot of heat with increased vcore.Bob.. :)

so then, kind of what you are saying is, try it and if things start to go whacky either crank up the volts or go back down to 4ghz

Basicaly, Yes! Download RealTemp, it is free. Use this to monitor your temps. To be on the safe side your cores temps should never go over 80C.http://www.softpedia.com/progDownload/Real...oad-118624.htmlDownload OCCThttp://www.ocbase.com/perestroika_en/You should start off by making sure that your current OC is stable. Run OCCT for one hour at your current OC. If you get errors then up your CPU vcore and/or QPI/Dram by one notch, run OCCT for one hour, repeat as necessary. I can not recommend that you go over 1.4 on your vcore or 1.37 on your QPI/Dram.If it runs for an hour with no errors then download Prime95 and run the default test for eight hours. If you get errors increase your vcore and/or QPI/Dram by one notch and repeat starting with OCCT for one hour. http://www.softpedia.com/progDownload/Prim...load-76537.htmlAfter you pass one hour of OCCT and 8 hours of Prime95 you should have a pretty stable OC.If you get any BSOD's make sure that you write the code down, this will confirm whether you need to raise vcore or QPI/DRAM.I will tell you that after I passed OCCT and Prime95 I started getting a BSOD every 7 to 10 days, I then had to further tweak my voltages. This is not something that I can tell you exactly what to do, you just have to adjust, test and keep doing it until you get stable. Here are my current BIOS settings. I have turbo mode, hyperthreading and a bunch of other crap disabled, this stuff can cause stability problems. Once you get stable at the OC you want you can enable the stuff if you want it and see if it affects your stability or not.When you look at my voltages and see something like this "1.30625 01/24/10 - 1.31250 02/07/10 - 1.32500 02/15/10" it mean that on 1/24 the voltage was set to 1.30625 and on 2/7 it was changed to 1.31250. On 1/24/10 I was at 4.2GHz and passed one hour of OCCT and eight hours of prime, you can see by looking at the changes the tweaks that I went through after I passed those stress tests. Hopefully it goes quickly for you. If you run into problems I would suggest that you join the forums at www.overclock.net and post any questions in the Intel CPU forum. As far as the programs to run for stress testing, everyone has what they like to use, not all people use the same ones or run them for the same amount of time, the above is just what I did.Note that the ram setup is for my 6-7-6-18 ram, you will need to adjust this to suit your ram.AI Overclock Tuner: ManualCPU Ratio Setting: 21xIntel SpeedStep Tech: DisabledIntel Turbo Mode Tech: DisabledBLCK Frequency: 200PCIE Frequency: 100DRAM Frequency: DDR3-1603MHzUCLK Frequency: 3208MHzQPI Link Data Rate: Auto (3600 MHz)DRAM Timing Control1st Information :CAS# Latency: 6DRAM RAS# to CAS# Delay: 7DRAM RAS# PRE Time: 6DRAM RAS# ACT Time: 182nd Information :DRAM Timing Mode: 1N CPU Voltage: 1.30625 01/24/10 - 1.31250 02/07/10 - 1.32500 02/15/10CPU PLL Voltage: Auto 01/24/10 - 1.82 02/17/10QPI/DRAM Core Voltage: 1.34375 01/24/10 - 1.35000 02/07/10 - 1.34375 02/20/10IOH Voltage: Auto 01/24/10 - 1.20 02/17/10ICH Voltage: Auto 01/24/10 - 1.20 02/20/10DRAM Bus Voltage: 1.66Load Line Calibration: EnabledCPU Spread Spectrum: DisabledPCIE Spread Spectrum: DisabledAll Other Settings: AutoAdvance CPU SettingsCPU Ratio Setting: 21x C1E Suppport: DisabledHardware Prefetcher: EnabledAdjacent Cache Line Prefetch: EnabledIntel