Help with overclocking q6600 on xfx 750i sli

simonc2303

simonc2303

simonc2303

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15 Jan 2010
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I know this has been looked into before so I do appologise but this is really doing my head in.

I built my own system using the following components

Motherboard xfx 750i sli (nvidia chipset)
cpu intel core 2 quad core q6600 2.4Ghz
Zalman CNPS9700-NT nVidia Tritium Super Aero Flower
Ram 8Gb OCZ DD2 800 MHZ ( 4x2Gb dimms )
2 x BFG Tech GTX 260 ( sli config )
nvidia 850W PSU
Hitachi HDT 250Gb (internal ) Hard drive
Maxtor 750GB External Hard Drive
Creative XFi Fatality champion Sound Card
power supply not sure of the make but it 850W and runs fine stable and quiet

The Problem I have got is this I overclocked the cpu to 2.68Ghz . With no increase in cpu temps. By raising the FSB from 1066 to 1192Mhz QDR (298) I kept the cpu multiplier at 9X in this case. But when i try to over clock any further the pc wont even post , so I re set cmos and start again.

I did read in forums about the chipset having an fsb hole. :confused: I have managed by changinf the cpu multiplier and voltages to get the pc to get past post and boot up but it freezes up almost as soon as the the desktop etc loads. I have tried raising the voltages to almost maximum safety level andhave also tried having them at factory defaults with little or no effect. :mad:

I am perhaps thinking it may be a ram issue brcause when i start in safe mode I have got a stable boot up with an overclock of 2.7 , 2.8 and 3.04 Ghz. :rolleyes: :confused: :rolleyes:

So then i thought about manually setting the ram timings etc and that did nothing so set them back to automatic. :eek:

this is really doing my head in as I have heard or should say read in various forums that my cpu should be good for an overclock of at least 2.8-3.2 Ghz. :D

am not a computer whizz .. but know a little bit ..

Just cant think of what voltages etc to use that would give me a stable boot up on an overclock of above 2.68 Ghz.

Am I being stupid or is it just my mtherboard that isnt overclock friendly. :(

thanks in advance my friends :D :D

hope you can help me ;) or make some suggestions :)

Simon
 
HI ya siumatfung

I did kinda try that. I knocked the Vcore an Nb voltages up a notch or 2 at a time and got to more a less the max saftey level for the board. What puzzles me though is why I would get a stable boot when i boot up in safe mode ..... which led me to think perhaps its an issue with the ram.

but that being said am open to any suggestions on what voltages etc to use..

also should the ram timings be left on auto

ta :D
 
is there a jumper or something that needs to be set on your motherboard to allow further overclocking?

and erm how high did you set the voltages to???

i mean safe or not is a matter of opinion :D and what revison is the CPU? well stepping?
 
Yeah overclock jumper was set to start with . I took the vcore up to 1.48v the ram volage was set to 2.10v and the nb was set to about mid range i think. Not sure what you mean by revision the cpu is or stepping as you put it lol .....
 
Try with just two sticks of ram in paired slots (they'll probs be the yellow ones, if not check in your mobo manual). OC with 4 sticks is generally much harder in my experience.

Hate to say this but the 750i is notoriously bad at clocking quads, are you using the latest bios?
 
Thangs for your reply mate but got it done .

Why this works I have no idea. What i did was I used the settings i Had done before for 3.04Ghz :-

FSB 1520 MHZ
CPU MULTIPLIER X8
Vcore 1.4V
fsb 1.25V
Ram 2.10 V

but this time i reduced the ram from 4 x 2Gb dimms to 2 x 2Gb dimms. pc now recognises dual channel memory and boot up is stable. Do you have any idea why the reduction in ram has worked and do you think that 4Gb is sufficient ..

thanks once again and cheers

Simon
 
Yay got it sorted

Thangs for your reply mate but got it done completely by accident :p .

Why this works I have no idea. :eek: :confused: What i did was I used the settings i Had done before for 3.04Ghz :-

FSB 1520 MHZ
CPU MULTIPLIER X8
Vcore 1.4V
fsb 1.25V
Ram 2.10 V

but this time i reduced the ram from 4 x 2Gb dimms to 2 x 2Gb dimms. pc now recognises dual channel memory and boot up is stable. Do you have any idea why the reduction in ram has worked neblemak and do you think that 4Gb is sufficient ..

thanks once again and cheers :p

Simon

ps gonna run occt for an hour and see what that kicks up and if still stable gonna reduce voltages a tad.
 
no worries, I had a similar problem with my q6600 and 4 sticks of ram. i guess 4gb is enough for most things but it would be a shame to have it and not to put it in.

i'm no expert my any means but there are a few things you could try to get all 8gb working:

1 - Bump up the northbridge voltage a bit, as this controls your ram. Its probs called 'nforce SPP' on your mobo. What is it set to now? From what i've read you can safely set that to 1.4v but you wanna keep it under 1.5v.

2 - Bump up the ram voltage a small bit. Be careful with this, if your mobo only has large increments of like 0.1v dont bother, but if you can put it to 2.12v, try that.

3 - Try bumping up FSB voltage a bit.

4 - I know you said about the FSB hole but higher FSB's can be less stable as far as ram is concerned. Have you tried 333x9?

5 - Manually loosen your RAM timings.

Nice bit of weekend tweaking ahead of you!
 
overclocking q6600 on xfx 750i sli

HI neblemak

yeah i tried 333MHz FSB x 9 buut on that setting my system wouldnt even post. Have just ran occt for 2 hours with no errors or problems dected and at end of test the temp of the 4 cores was 45 45 43 and 43 degrees c respectively. I have begun to reduce voltage increases back to a minimum.

I agree what you say about it being a bugger if cant utilise all my 8 Gb of ram. what am going to do is try it with 3 sticks then introduce the forth. I think a poss issue i had that I should have put the dimms of ram in opposing slots and i had not done that.

at the end of the day though would rather have a stable overclock on 4Gb ram and have 4Gb spare than to have an overclock of only 2.68 GB on 8Gb ram.

will let you know how it goes and thanks once again .

kind regards .....

simon
 
Simon

Yeh I agree about the overclock vs 8gb thing. You should do some research if you're gonna try and use 3 sticks. Either 2 will operate at dual channel and 1 at single channel or all 3 will operate at single channel mode (which you don't want), this depends on the mobo and to be honest I don't know! Maybe someone here knows more?

If you're gonna stick with 4gb for now, try 400x8, you'll get some nice round numbers on the fsb and ram that way with the obvious benefits of a 3.2ghz system.

Good luck,

Neb
 
cheers neblemak.... got it to work with 6Gb fine but just freezes with 8Gb. went into bios on boot up and according to that the memory is still in dual channel mode and as i dont really want to push voltages etc any further am going to leave it at that . then at least I got a 2Gb stick of ocz spare then ..

am going to run prime 95 overnight and see what it throws up and while my tea is doing am gonna see what see what benchmark am gonna get from 3dmark06.

cheers mate
 
am happy at last

Just to let you know neblemak and others :p I am finaly happy with the results I have got. :D

Neblemak I never did manage to get it to boot with 8Gb Ram :mad: so have settled on 6Gb :) . Have got 4Gb ( 2 x 2Gb ) running in dual channel mode and the other 2Gb running on its own.

I did manage to get an overclock of 3.2Ghz using (1600 MHz FSB and 8x multiplier) but thought that under OCCT testing the cores of the cpu were a little hot at 59 62 62 and 61 degrees respectively. So I dropped the voltages a few notches, put another fan in the back of the case to increas airflow, dropped the FSB to 1550MHz and using the 8 x multiplier I have a stable overclock of 3.10 Ghz and at peak through large data set OCCT test the core temps were 54 55 53 and 54 degrees respictively. :D :D

Although I could have probably ran the cpu at 62 degrees or so... I felt knocking it back and putting in a fan at the back of the tower to increase airflow was a more comfortable compromise as the cpu temp is now mid 50's. might re apply the thermal paste as have not done so in about 6 months :P

got a cold draught around my legs now though lol...

I still have the settings written down for my 3.2 Ghz so could use them i the future. But i think I am more or less at the limit of what my cpu can do since increasing it by another 100 Mhz causes a comparatively large temp increase.


Thanks so much once again for all of your help and input ... couldnt have done it withouht you... :D

In the words of Ronnie James Dio " We Rock ! "

kind regards

Simon
 
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