Little bit of overclocking help. Q9450 on X48 Motherboard

wasc

wasc

wasc

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Hi all,

I have a Gigabyte X48 motherboard and the Q9450 45nm quad chip. Ram is DDR3. I'm currently stable at 3.5Ghz, but really think there is more room left for this to go higher. I'm struggling to get it stable at 3.6 as one of my cores fails prime.

Question 1) At 3.6Ghz cores 1, 2 and 3 run fine but core 4 fails prime. This was at 1.3 VCore. I have tried 1.325, 1.337 and also 1.350 vcore. Core 4 takes longer to bomb out now (45 mins as opposed to 2 mins at 1.3Vcore) but going from 1.3 to 1.35 is a pretty high jump in Vcore and i'm suprised it's still not stable? I heard these 45nm chips are sensitive to the volts so don't wanna go higher without some forum advice. Temps are 63 under full load as measured by Real Temp. Idle is 42 degrees. This is on a tuniq tower not watercooling. Should I just keep upping the Vcore or is there something else you can advise.

Question 2) Loadline Calibration - This is a bios setting that I believe is supposed to aid an overclock. At the moment I have this disabled as I believe it does something voltage wise. Should I have this enabled and could it put too much vcore through the chip?

Question 3 - I've heard people refer to CPU PLL voltage. Where is this on a Gigabyte motherboard? Is it "FSB Voltage"?? Or "(G)MCH Voltage"? Any idea for safe values of this on 45nm?
 
Be very careful with the PLL voltage (clock generator voltage)- you can seriously damage your CPU if you are not careful! I'm afraid I don't have this board, but does your BIOS gave a CPU VTT voltage to adjust? If so try upping that a bit
 
Gigabytes FSB Voltage is the CPU VTT voltage. It usually needs a fair boot up the backside for these 45nm chips. MCH/Northbridge needs upped too.

Vcore probably won't need to be much more than 1.35v under load for 3.6ghz, probably less. And there's no real need to enable the Loadline Calibration with these chips tbh.
 
Thanks for the help so far guys.

Surge: Thanks for that link - will read the whole thread through - that is my mobo.

Cob: Is Cpu VTT the same as this PLL value I hear? Any idea what sort of increment is safe?
 
To give you an idea, I set CPU VTT (the FSB voltage on your board) to to about 50 mV (0.050 V) less than the CPU VID (VCore) voltage for my Q6600 at 9x400 on the board in my sig. PLL is something different (Southbridge) and should really be left alone.

This

http://www.clunk.org.uk/forums/1919-post16.html

is for a Q6600 at 9x400 on the Gigabyte X38 board, but the settings might help since the bios is very similar

Good luck:)
 
wasc said:
Thanks for the help so far guys.

Surge: Thanks for that link - will read the whole thread through - that is my mobo.

Cob: Is Cpu VTT the same as this PLL value I hear? Any idea what sort of increment is safe?
Click to expand...

Nope it's different. ~0.25v above stock should be fine (I've mine at 0.3v above the stock setting in my P35 board, but yours should be a better chipset and shouldn't need to be as high).
 
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