Alright....I have everything up and running...and my CPU overclocks to 3700mhz with a simply bump of the vcore to 1.3 and FSB to 370. Anything after that and I lose stability. What other settings should I be looking at to get it to 4,000mhz? This board has a bunch of voltage settings I am not used to. Do I need to mess with any of them? Should I mess with any of the memory settings?
Your probably going to have to play with more than the basics to get 4.0ghz, but 3.7ghz @ 1.3v your still got plenty of head room CPU voltage wise, from what I've seen you'll need between 1.36-1.4v to get 4.ghz stable (1.45v is generally concidered the max save day to day voltage for a 45nm Core2Duo), you will problably want to tweek a few of the chipset voltage too.
Going straight for the kill, with CPU voltage and FSB alone almost never works, it best to take it in stages.
Start by checking you have the
lastest bios for the mother board, if not download the last version and update using Q-Flash in bios.
In Bios under 'Advanced Bios Features' disable: C1E, TM2, IEST (these features can fight you when your overclocking)
Next you want to try and get to the FSB and RAM working stablely at 400mhz (1600 FSB) while keeping the CPU clock speed and core voltage basically stock. To do this you want to get the 'CPU Clock Ratio' to between 6-7x(6x +0.5 while be the closest to stock), Set the 'CPU Host Frequency' to 400mhz, I like to manual set the 'PCI-E Clock Freqency' to 100mhz, disable CIA2, set the 'System Memory Multiplier' to 2.0B, leave the 'DRAM Timing Selectable' to auto unless the memory timings don't match those on the written on the RAM, leave the CPU core voltage stock, you may want set 'DRAM OverVoltage Control' to +0.2v (Corsair RAM seem to like the extra voltage). This will get you the CPU running at about 2.6ghz with 400mhz (1600 FSB), with the ram running at stock DDR2-800, do a few stress tests it at these setting and tweak the PCI-E/FSB/MCH Overvoltage Controls as need to get it stable probably on need about +0.1v on each but you'll need to play with each and see what result you get.
Once you have the system 100% for like 2 hours at 100% load in Orthos, you can move onto the next step which is to increasing the 'CPU Clock Ratio', one step at a time so from 6x to 7x, then to 7x to 8x ...., and test the system for stablity with each step, increase the CPU voltage as needed, in theory you should get to 9x at ~1.3volts which with a 400mhz (1600FSB) will give you a 3.6Ghz clock speed,at this point you will probably want to start using the 'Fine CPU Clock Ratio' to add +0.5 to get a cpu mutliplier of 9.5, also suggest without change any other setting dropping the 'CPU HOST Frequency' to 390mhz this will under clock your RAM a little but give you a CPU clock speed of 3.7ghz (which you've aready had stable) but with a higher FSB, once you happy the system is stable at those setting you can increase 'CPU HOST Frequency' back to 400mhz which will give you 3.8ghz with 400FSB thise will probably require more CPU core voltage but with a with little luck you shouldn't have to play with anything else, once stable there the next step is change the 'CPU Clock Ratio' to 10x the 'Fine CPU Clock Ratio' to 0.0 and lower the 'CPU HOST Frequency' down to 390mhz once again, this will give 3.9ghz again your will likely need to add more CPU core voltage (don't get carried away) you may need to tweak the chipset voltage again at this point to get it stable (very likely if it fails to POST) once your happy if's stable there go for the kill, bump the 'CPU HOST Frequency' back to 400mhz add tweak CPU voltage as needed to get it stable at 4.0ghz.
Don't get silly with the CPU Core voltage you don't want to use anymore than you have to, also check what the actual CPU Core voltage is in CPUz you'll notice that the actual voltage is often lower than the voltage set in bios (this becomes more notice as you raise the clock speed of the CPU), it will also drop lower under full load, you want the Acutal CPU Core voltage to stay below 1.45v for day to day running, but I wouldn't think you'll need much more than 1.4v to get it stable. You will want to stress test the system for 1 to 2 hours each step of the way, may sound like a waste of time but it's no good increasing the overclock if it's not 100% stable at the current settings.
The newer versions of the bios have some addition tweaking options, but I'm working from the PDF version of the manual for your board, I've got a GA-X38-DQ6 which has basically the same bios, but I'd need you to confirm that feature and options are available in the 'MB Intelligent Tweaker' section of you boards bios, before can offer advice of what else might help.