Cold bug or just a dud chip?

Wega! · Mar 13, 2011

If a chip cold bugs, wont it start up at all then? Or will it just perform badly? I'm running a E6600 under dive atm, and the darn thing wont even do CPU-Z above 4050Mhz :bang head

Is it just a bad chip, or can it be some kind of cold bug? Does 775 CPU's even have cold bugs?

Wega! · Mar 13, 2011

It even scales with voltage at those lousy speeds... = Crap chip?

CgS Drone · Mar 13, 2011

From what I have been told 775 will CB around -125 give or take on average. I have been told that chips that don't do well on air may do really good under cold but I haven't heard anyone say the reverse is possible. Maybe someone with more 775 experience will chime in.

Wega! · Mar 13, 2011

I'm only at -70C...

Bobnova · Mar 13, 2011

They do have coldbugs I think, though not at dice levels that I'm aware of.
I would drop the multi and see if it still eats it at 4ghz, or whether it still eats it at the same fsb.

Wega! · Mar 13, 2011

Bobnova said:
They do have coldbugs I think, though not at dice levels that I'm aware of.
I would drop the multi and see if it still eats it at 4ghz, or whether it still eats it at the same fsb.

Tried that, it's not a FSB wall. I'm running at only 440Mhz FSB now and cant get higher, but 475Mhz FSB was no problem with lower multiplier...

torin3 · Mar 13, 2011

Bobnova said:
They do have coldbugs I think, though not at dice levels that I'm aware of.
I would drop the multi and see if it still eats it at 4ghz, or whether it still eats it at the same fsb.

I had an x3340 that CB at about -90°C, a e8400 that CB at about -125°C, and a Q6600 with no CB at all.

CgS Drone · Mar 13, 2011

Double checked all settings in bios to make sure nothing was turned on after a clear cmos when you changed cpu's?

CgS Drone · Mar 13, 2011

torin3 said:
I had an x3340 that CB at about -90°C, a e8400 that CB at about -125°C, and a Q6600 with no CB at all.

Make much difference with the Q6600 after a certain temp? other than just not having to worry about CB'ing during the runs.

Wega! · Mar 13, 2011

CgS Drone said:
Double checked all settings in bios to make sure nothing was turned on after a clear cmos when you changed cpu's?

Been through it a couple of times, and I'm using the same settings as I did when I ran 620Mhz FSB on this board.

CgS Drone · Mar 13, 2011

If you have gone through all of that and its stopping at the same Freq. then I suggest you immediately box up your pot and ship it to Bobnova for extensive testing to make sure it is working correctly :rofl:

You have checked to make sure its not a FSB thing and all bios settings so if the chip is locking at the same Freq then I would guess its just not going to OC well. :bang head

I guess just triple check on everything and call it a dud :shrug:

m0r7if3r · Mar 13, 2011

it SOUNDS like you missed a setting or something like that...that or the chip is a complete dog

Wega! · Mar 13, 2011

I triple checked:

Vcore
PLL (Working on a tip bob gave me)
VTT
NB volt
SB volt
DDR volt
FSB strap
RAM speed
RAM timings
RAM strap
All temps are ok.

What else is there?

Seebs · Mar 13, 2011

Have you tried dropping the voltage?

When I did my E6300... I started with 1.7 VCore, NB 1.45V and started giving it FSB and once it wouldn't post I gave it more volts, but it wouldn't budge and I was stuck at 548.
And then I just decided to try something different... Dropped VCore to 1.625, NB to 1.40 and the rest of the settings to auto... that got me to 560FSB.

ChanceCoats123 · Mar 13, 2011

Wega! said:
Been through it a couple of times, and I'm using the same settings as I did when I ran 620Mhz FSB on this board.

Since you know the board will do 620+, you need to find new settings that will get the chip as high as possible.

Settings that are perfect on one chip =/= settings that are perfect on another.

torin3 · Mar 13, 2011

CgS Drone said:
Make much difference with the Q6600 after a certain temp? other than just not having to worry about CB'ing during the runs.

Not really. I got most of my boints out of it at -125°C. I wasn't able to clock it any higher when I got it to -183°C.

Wega! · Mar 13, 2011

Appreciate all your help guys

However , I've tried with lower Vcore, PLL and VTT without any difference. I've tried to give it 1.8Vcore but that gave me BSOD instantly.

I played around with the PL settings, and setting a higher PL gave me less stability?

ChanceCoats123 · Mar 13, 2011

Have you tried using SetFSB from within Windows?

Wega! · Mar 13, 2011

ChanceCoats123 said:
Have you tried using SetFSB from within Windows?

I'm using the build in SetFSB on the Rex

Seebs · Mar 13, 2011

Wega! said:
I'm using the build in SetFSB on the Rex

I don't think anyone has asked this...

Stepping? Revision?

Oh.. And I think there may be just one thing left for you to do... Send that chip to someone else that runs 775 so they can do some more testing on a different board.

Cold bug or just a dud chip?

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