Puny overclock on water!!!

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I don't seem to be able to get the FSB to go over 310 ! Using an E6600 with a P5B Deluxe - WATERCOOLED - and my temps have yet to go over 41c. So, I get about a 2.8ghz o/c stable with Orthos 2004 on "blend" but any higher and Orthos errors.... I'm on XP and using 4gb DDR2 6400 set at 5-5-5-15, inlcuding a RAM divide of 1:1

Is there something really fundamental I'm missing here?

The VCore voltage doesn't on auto - I took it from 1.36v and orthos errored at 9mins, then 1.37v just brought an error after 30 secs !!!!

Any ideas?
 
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You could have an FSB hole, or a low FSB wall. Drop the multi as low as it will go, and run Orthos with an FSB of 400 or so, and see if it passes. If it does, you don't have a problem at that level with a wall. Next, try putting the multi back up, and trying with an FSB of a few mhz higher than you have done before to see if there is a hole.

What's the stock voltage of your chip? My E4500 gets to 2.8Ghz on stock, but any higher than that requires nearly .1v more!
 
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yikes! it didn't like that at all.... set the FSB to 400 and the multi to 6

got a BSOD

i'm back to FSB @ 310, multi @ 9 and stock voltage now....
 
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vcore needs more voltage m8..1.36 in bios will be like 1.31 when loaded up due to vdrop. what are the memory sizes eg 2x2gb or 4x1gb?....if its 4x1gb id take 2 gb out and put the vcore up to 1.4v and try it...
ps . ive got the same cpu +mobo m8 ;):D
 
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The problem was, when I was trying FSB @ 325 and voltage @ 1.36, orthos crashed at 9mins - I then notched the voltage up to 1.37 and it crashed at under a minute

does this mean that increasing the voltage isn't the answer?
 
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Success! Massive thanks to GoodShot - i'm now at FSB 335 and 1.4v (in bios) giving 3Ghz @ about 42c, running Orthos Blend fine for 7 hours. (I also removed the 2x1gb of RAM as suggested). As always, though, there are more questions than answers!

1) Why would removing the 2gb RAM have helped?
2) When people usually quote VCore, is it the BIOS setting they mean or the "Vdroop" affected one? Eg my BIOS set 1.4v is shown as 1.334v in CPU-Z.
3) If I want to stretch to 3.4ghz plus, do I just keep on upping the FSB (with vcore increase if needed) or will I HAVE to address memory timings etc?

I've learnt so much in 24 hours!!!!:D
 
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By running 4 sticks of ram it is usually beneficial to increase the NB voltage a notch or two to aid stability. Also, as Bledd says, check you have the correct voltage set for your ram.

1.4v seems a lot for 3Ghz. Are you really sure it needs that much? Most should do 3Ghz on stock volts. Mine does 3.6Ghz (8x450 or 9x400) with 1.4v. It needs 1.45v for 3.8Ghz though.
 
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Unless I am missing something isn't it the northbridge voltage which has a bigger impact on what stable FSB you can get, rather than the cpu core voltage?
 
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1.4v seems a lot for 3Ghz. Are you really sure it needs that much? Most should do 3Ghz on stock volts. Mine does 3.6Ghz (8x450 or 9x400) with 1.4v. It needs 1.45v for 3.8Ghz though.


P5B`s are notorious for undervolting from what is set in the bios.
I am still running 2 of them, one in mine and the other in my sons and both do this. for instance so I can get a actual 1.4v ( DMM measured ) to the cpu it needs to be set to 1.45 in the bios.
 
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Think I'm going for the 4 sticks again - with the voltage tweaks as recommended.

Out of interest, will CPU-Z give you a "true" voltage to CPU measurement?

And which is the best program to measure the Northbridge temp?
 
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