Overclocking Q9550 on Asus P5E-VM DO

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gogotchi

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Aug 3, 2014
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I have this old PC, equipped with an Intel Core 2 Quad Q9550 12MB Cache FSB 1333 MHz processor, an Asus P5E-VM DO motherboard, 2 x 2GB DDR2 800 MHz and an old 512 MB 64 bits XFX 9500 GT video card.

I'm trying to overclock my processor but I just keep receiving a blank screen after the computer reboots and later (after I turn it off and on myself) the message that my overclock failed. These are the settings I change in bios for oc, the rest I keep at their default values, most of them 'auto':

C1E - disabled
SpeedStep - disabled
CPU Spread spectrum - disabled
PCI Spread spectrum - disabled

CPU voltage - 1.3125 (max for Q9550 is 1.3625v)
DRAM voltage - 1.80v (accordingly to memory vendor)

CPU multiplier - 8.5 (range: 6.0 - 8.5)
FSB - 400 MHz
PCI-e frequency - 100 MHz
DRAM frequency: DDR2-800
DRAM timings: 5-5-5-15 (accordingly to memory vendor)

I already tried other combinations of

CPU multiplier - FSB - DRAM frequency

without suceeding in getting even a CPU 1 MHz increase. Is it possible to overclock a Q9550 processor in a P5E-VM DO motherboard? If yes, which settings should I use? My PSU is a Seasonic 300W SPC Active 80 Plus.

Thank you guys.
 
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Ironsounds

Ironsounds

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Jul 31, 2011
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Hello... what is the default FSB? 333?
What is the Default PCIe Freq? 100?
You need to lock the PCI freq at 100 and set memory to no higher than 2.0 volts...
Try raising the FSB first to 365 and see if it BOOTs... what is the CPU and Memory speeds indicated?
 
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G

gogotchi

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Aug 3, 2014
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Hi @Ironsounds and @reedo_43.

I did the trick with the DRAM voltage to no avail. :(
But an intermediary FSB and a trick from reedo_43's manual worked. :) :)
Now my settings are these:

C1E - disabled
SpeedStep - disabled
CPU Spread spectrum - disabled
PCI Spread spectrum - disabled

*CPU voltage - 1.1250 (max for Q9550 is 1.3625v)*
DRAM voltage - 1.80v (accordingly to memory vendor)

CPU multiplier - 8.5 (range: 6.0 - 8.5)
*FSB - 375 MHz*
*PCI-e frequency - 109 MHz*
*DRAM frequency: DDR2-750*
DRAM timings: 5-5-5-15 (accordingly to memory vendor)

The problem is: I heard any increase in the PCI-e frequency is really bad and can damage the VGA card and the hard disk. So, should I keep this or is a bad idea? I already tried to decrease the PCI-e frequency but 109 MHz is the minimum to my computer boot. I checked at Everest too and it already see my VGA card as a x16 one, so this increase in the PCI-e is really weird.

A side question: after two blue screens while I was adjusting the CPU voltage, my Prime95 now starts but always crashes (APPCRASH) when I try to run its tests. The windows continues working fine. Any other app I can use in its place?
 
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G

gogotchi

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Aug 3, 2014
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More details:

* I don't know the PCI-e default frequency;
* My memories are DDR2 800 MHz from an average and unknow to the rest of the world brand. So it should not be that good and, indeed, I can't use a DRAM frequency higher than 750 MHz or my PC doesn't boot. Already tried CPUm = 8.0, FSB = 400 MHz and DRAM freq = DDR2-800 to receive a blank screen.

But I'm already glad with this small overclock. :) Just the higher PCI-e frequency that is worrying me a bit. :/
 
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G

gogotchi

Reputable
Aug 3, 2014
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So, I guess my motherboard really aren't ready to work with processors on a FSB higher than 1333 MHz... What a pity 'cuz this little old Q9550 gives a juice 'till today...

Thank you for all the help, people. :)
 
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