Ok so I am an overclocking noob. I have been reading a ton about how to overclock and I think that I am getting the basics down, but I cant seem to get the computer to let me go higher than 3.0 ghz. My Ram is patriot extreme 2x1gb 4-4-4-12 timing. I have followed the basics on this thread http://www.tomshardware.com/forum/ [...] clock-650i although it is for a 6600 I used some of these settings to disable things in the bios. Any suggestions would be great.

need a few more details. What voltages are you using @ 3.0ghz. It may also be that you need to loosen your memory timings a bit while doing the overclocking.
When you say you can't get past 3.0ghz what do you mean? Do you mean you can't post or get into windows or do you just fail a stability test?

Sorry... the voltage for 3.0ghz is set to 1.336 (+.0250). The timings are at 4-4-4-12, should I change them to say 5-5-5-15? and what i mean by cant get past 3.0ghz is the system locks up and right before bios it says that processor is for 333 and resets it back to last good config. hope this helps.

Ok, it maybe that you need to increase your vcore a bit but also some other voltages eg nb core and sb core which will need increasing to help with stability, I'll need to know these as well if possible. Before increasing the voltages do try loosening timings to like you said eg 5 5 5 15 or 5 5 5 18. Also what is your FSB:RAM ratio. This will either be a number like 5:4 (ddr2 800) or it will say "linked" or "unlinked", but it depends on which mobo chipset you are using.

sorry about all the info needed!

Do NOT raise SB voltage. Make sure your PCIe freq is locked at 100MHz as well. You shouldn't need to raise NB voltage just yet. I'm guessing you had your RAM:FSB set too high. RAM won't post much past rated speed.

Ok here are the settings and voltages:

DOT Disabled, EIST Disabled, CPU Spread Spectrum Disabled, PCIE Spread Disabled,Cpu spread disabled,sata spread disabled, bit suppot disabled,set limit cpu id disabled, C1E disabled, HPET disabled, COmmand per clock 1T (memory), FSB 1500, RAM 800, PCIE 100, DRAM 4-4-4-12 rest auto, cpu volt .0250 (core 1.336) memory volt 2.20, NB 1.25 default, SB 1.50 default, FSV VTT Volt 0%.

Hope this is enough info. TIA

Ok thanks. What to do:

1. Loosen timings of ram and try to boot
2. Then start adding bits to your vcore while trying to boot after each, keeping a careful eye on temps
3. It may be that your NB voltage also needs a small increase to say 1.3 but watch temps.
4. If you pass 400mhz then you MAY need to add 0.5 to SB.

This is just to get you past the 3.0ghz mark but after that you will need to increase all of these more to get a higher frequency.

Try these in order. I reckon its a voltage issue so try adding to that for stability, but be very careful with temps.

Well I must be a crazy noob because I cant get above 3.04ghz. First of all what should I loosen the timings to? What about the command per clock setting I have 1T 2T and Auto to work with?

Set command rate to 2T and your RAM timings to 5-5-5-15. You want your RAM to be as flexible as it can be while you dial in your CPU speed.

I already have those settings right it must be a voltage thing. I set the vcore to 1.4 and the NB to 1.3 and when i went over 1524 fsb it will freeze during windows startup. Could it be the SB? If so isn't that where you can start screwing things up?

Well if your aiming at booting at 3.0ghz to begin with, surely you need your fsb to be @ 1500 as 1500 / 4 = 375 and 375 x 8 = 3000 (or 3ghz). Or at least thats what it should be at if you are using a 8x multiplier.

What cooling are you using at the moment. If you have any quite decent form of after market HSF, then I wouldn't worry about increasing the vcore some more and seeing if you can boot with this. Don't forget you can more or less run a PC 24/7 with the vcore at about 1.5, just make sure you have good cooling. try referring to some of the overclocking guide at the top of the forum to see the other voltages that may need increasing. I'm not saying that you should set the vcore to 1.5 immediately and see what happens, but simply work you way up the 1.3's a little whilst monitoring temps.

Vcore at 1.4 is REALLY high for a 6750 at 3.0GHz. Most likely, you need to raise the NB a hair. I clocked my 6750 to 3.0 on stock voltage. I'm just a hair over 1.4v at 3.6!

Make sure once again that your RAM divider is set 1:1 and your RAM is getting proper voltage. That should completely remove RAM as the culprit unless you have a bad stick. You can leave the vcore at 1.4 for the time being, but once you get it to post, lower it back to 1.35 at least and see if it still boots. It should quite honestly.

Up the NB to 1.4 as well. It won't hurt it. But I wouldn't suggest going over 1.6 on the NB as it tends to get hot quickly.

Try that once and let us know

Sorry for the confusion I can get to 3.0 with a 1.336 vcore, i just left it there after trying to get it higher. BTW I have a Cooler Master Hyper Tx2 cooler and with the vcore at what it is right now it is sitting at 43 under prime 95 load. Im not sure if my mobo has a 1:1 memory setting or maybe it is disguised as something else?

That seems really really cool for full load on air. Did you calibrate your thermal monitoring before you started?

Well im using core temp... how do i calibrate?

CPU section, CompuTronix sticky post.