Need help overclocking Q6600 G0

Stonedofmoo · 23 Feb 2008 at 16:52

Hi all. I bought a Q6600 G0 from the members market and the owner said it would do 3.6 @1.4v

Only trouble is I'm not managing that

I have a MSI P35 Neo2-FR motherboard with v1.8 bios.
Artic Cooler 7 Pro
4gig Geil PC6400 RAM
GF 8800GT
Hiper 630w psu

In the BIOS I set it to 1.4v and 400fsb and it blue screens almost straight as it starts booting. I've notched it up to 1.45v in the BIOS and that gets into windows fine, but soon as I run Prime95, BSOD.
CPU-Z reads it as 1.4v when I set 1.45v in the BIOS, quite a droop!

The temps seem my biggest enemy. Right now at 3.45gig and 1.465v in the BIOS it's reading 86 degrees of heat in CPUID hardware monitor while I run Prime95 in Small FFT mode. This seems rather a lot?

I've tried taking it off and reseating the cooler and applying a thinner layer of AS5 but it's still about the same.

Any tips for me here? What FSB VTT Voltages should I be using?

Many thanks

Stonedofmoo · 23 Feb 2008 at 17:16

Righto, well Coretemp shows the same temps

Here is a pic of my current BIOS settings

Air flow is fine, theres are lots of case fans and having the side off doesn't make much difference.

Heres are the windows settings. I note how much lower the VCORE is after you get into windows and run prime95 compared to the setting in the bios!

Should I maybe 'lap' my cpu and cooler? What do I need for that, fine grain sandpaper?

Stonedofmoo · 23 Feb 2008 at 17:24

IAmATeaf said:
Rather then aiming for 3.6 why don't you start off with 3.0Ghz and then work up from there.

OK. I've set everything to stock volts and now set it to 3.1gig and it's running Prime95 happily at stock volts. I'll push it to 3.2 after a bit if it runs Prime95 for a while, I want to see it's limits at stock volts. It would seem extra volts really pushes the heat too high and possibly is causing the instability

Running @ 3.1gig prime95 temps are at 68/66 degrees across the cores.

Edit: I've ordered a heatsink lapping kit. I think I shall lap the CPU and the heatsink because those temps are less than ideal

Stonedofmoo · 23 Feb 2008 at 19:33

It won't run more than 3133Mhz without additional vcore voltage

Is that about normal for these chips?

Stonedofmoo · 24 Feb 2008 at 10:19

I do yes, but it ramps up to the full 3000rpm as soon as it goes over 55 degrees which is pretty much what it idles at when I go for 3.6

I've got a cpu and heatsink lapping kit on the way so I plan on lapping them to see if it's a bad contact. I notice theres 4 degrees difference in temps between the 2 cores.

Stonedofmoo · 24 Feb 2008 at 22:13

at 3133Mhz and stock voltage it idles at high 40's and under load hits 69 degrees. I've reseated it 3 times and used the correct amounts of AS. I don't know whats up with it but for now I shall wait until I have lapped it

I mean there can't be anything different about my chip and cooler to anyone elses can there :S

Stonedofmoo · 26 Feb 2008 at 19:15

WOW!

I've just finished lapping the heatsink and cpu and straight away there is a BIG difference. Now running Prime95 at my previous speed of 3133Mhz and stock volts and it's not going past 59 degrees, the fan isn't even having to speed up to keep things under control.

I'll try moving up the speed shortly