HELP!! setting up cpu voltage!

Sym Joy · May 7, 2008, 07:21 AM

hi

i have asus P5E-VM HDMI mb and a intel C2D E4500 processor.
my system have failed at 400x8 but it looks stable at 400x6 and it is the current configuration and in cpuz it show that processor currently using 1.184v. i have raised it 1.35 but it does no good at 400x8.
please help how much voltage should i increase or is this is the limit of this processor!

thanks in advance!

mkk · May 7, 2008, 07:48 AM

Try something like 9x350 and see if that's stable, then work upwards from there. Many would happily throw a higher voltage at it but I prefer to find a sweetspot. It's up to you and how good this particular CPU at overclocking. You may also have to raise the voltage for the system bus and/or northbridge chip if the motherboard has such settings. 0.1V or 0.2V extra is safe there.

Sym Joy · May 7, 2008, 07:56 AM

thanks for the quick reply.
it does'nt post at 9x350 but it boots at 333x9 but fails when loading windos.
and now im going to try the voltage option.
and let you know the result.

Sym Joy · May 7, 2008, 08:18 AM

pls tell me where to start from the northbridge chip voltage, in the bios it sets on auto.
it has another options of northbridge voltage referance.

NOTE: this mb is using G35+ICH9R chips

what is the correct voltage of this chips?

pls help!

mkk · May 7, 2008, 08:49 AM

I had a peek at the manual and the non-CPU default voltages seem to be the lowest possible setting. That's logical because there's no use for undervolting parts of the motherboard. The voltages named in the manual as FSB Termination Voltage and North Bridge Voltage may be necessary to raise a little when using high CPU system bus clocks. But my guess by those results described above is that it's mostly the CPU itself that is the limiting factor.

I see there's also a setting for CPU Spread Spectrum, a feature that can reduce electromagnetical interference inside the system. A side effect is that it can also make it a little bit more difficult for an overclocked system to retain stability, so try disabling it.

kris23 · May 7, 2008, 09:06 AM

try putting more volts into the NB chipset, then if that doesnt work

try the FSB termination voltage,

but most importantly, look at the voltage monitor in the BIOS, the readings are more accurate than the inputted volts.

Sym Joy · May 7, 2008, 10:19 AM

thanks, im going to try this now.

Sym Joy · May 7, 2008, 12:47 PM

i think for this proc 8x400 or speed of 3.2/3.3 is the sweetspot, though im not sure about the voltage. is it too high for this proc to running on 1.41v, temp shows on idle at 40 and at full load near 60-61 at stock cooler. i think its need a cooler.

pls tell me about the voltage should i lower it?

Sym Joy · May 10, 2008, 01:33 AM

thanx for your tips kris23, but it seems mkk was right about this processor. by spending 2 days evulating this mb proc combo i found that this proc doest not run at 2800~2850 no matter what volt i set.

so i think i will be doing a 3ghz(8x375) at 1.3625 till i get a new proc that does overclock better.

thanks for all the help guys.

kris23 · May 10, 2008, 10:05 AM

interesting....

**ChaosMinionX** · May 10, 2008, 01:20 PM

Quote:

Originally Posted by Sym Joy

thanx for your tips kris23, but it seems mkk was right about this processor. by spending 2 days evulating this mb proc combo i found that this proc doest not run at 2800~2850 no matter what volt i set.

so i think i will be doing a 3ghz(8x375) at 1.3625 till i get a new proc that does overclock better.

thanks for all the help guys.

Could you post your voltage settings if I gave you the template for that board?

Quote:

Mutiplier -
FSB Strap -
FSB -
PCIE -
DRAM -
DRAM Timing Control -

Clock Over-Charging Mode -

Spread spectrums Disabled

CPU Voltage -
CPU Voltage Reference -
CPU Voltage Damper -
PLL Voltage -
DRAM -
FSB Termination Voltage -
North Bridge Voltage -
North Bridge Voltage Reference -
South Bridge Voltage -

Thats specific template for the P5E-VM, fill it out with your BIOS settings and I will tell you what your doing wrong

Sym Joy · May 12, 2008, 03:37 AM

ok, here is the info u asked ChaosMinionX

AI Overclocking - [Manual]
Mutiplier - [7]
FSB Strap - [Auto]
FSB - [400]
PCIE - [100]
DRAM - [800]
DRAM Timing Control - [Auto]

Clock Over-Charging Mode - [Auto]

CPU Spread spectrums Disabled - [Yes]
PCIE Spread spectrums Disabled - [Yes]

CPU Voltage - [1.4500]
CPU Voltage Reference - [Auto]
CPU Voltage Damper - [Auto]
PLL Voltage - [1.50][Lowest in the menu]
DRAM - [1.86]
FSB Termination Voltage -[1.20][Lowest in the menu]
North Bridge Voltage - [1.25][Lowest in the menu]
North Bridge Voltage Reference - [Auto]
South Bridge Voltage - [1.05][Lowest in the menu]

this is all in the over JumperFree Page

and in the CPU Configuration Page

Multiplier - [7]
C1E - [Disabled]
Execute Disable Bit- [Enabled]
TM Function- [Disabled]
Speedstep Technology - [Disabled (guessed)]

Now, if i set the multiplier to 8 it boots and i can load vista, but at the prime95 it fails.

so my idea is if i can run it at 7 multiplier i can decrease the volt and have stable system.

but i want the increased FSB because it increases the memory perfomance and lowers the latency.

That is all.
i hope you can find what is wrong.

thanks in advance.

PS: sorry for my bad english (Not a native language).

**ChaosMinionX** · May 12, 2008, 11:19 PM

AI Overclocking - [Manual]
Mutiplier - [7]
FSB Strap - [Auto]
FSB - [450]
PCIE - [100]
DRAM - [950]
DRAM Timing Control - [manual]
im guessing your ram is 4-4-4-12 or 5-5-5-15 (if its different say so

)

Clock Over-Charging Mode - [auto] (.90v if needed)

CPU Spread spectrums Disabled - [Yes]
PCIE Spread spectrums Disabled - [Yes]

CPU Voltage - [1.350]
CPU Voltage Reference - [.61x](if you can use .63x/.65x set it if the problem isnt fixed)
CPU Voltage Damper - [Enabled]
PLL Voltage - [1.50][Lowest in the menu]
DRAM - [2.00]
FSB Termination Voltage -[1.3]
North Bridge Voltage - [1.45]
North Bridge Voltage Reference - [.61x] (if you can use .63x/.65x set it if the problem isnt fixed)
South Bridge Voltage - [1.05]

this is all in the over JumperFree Page

and in the CPU Configuration Page

Multiplier - [7]
C1E - [Disabled]
Execute Disable Bit- [Enabled]
TM Function- [Disabled]
Speedstep Technology - [Disabled (guessed)]

Try those settings.

Sym Joy · May 13, 2008, 02:05 AM

i try those settings, but no luck man.
it doesn't even post.

this is the settings i also tried.
cpu voltage to 1.4875v
NB voltage ref to .67 [.61x,.67x]
the highest CPU voltage Ref is .63x but it
doesn't work.

ram is not a problem because i was able to load windows at the freq
and volt in here.

this time i try to raise the multiplier to 8 but it doesn't help either.
and the dram is not posible at 950 at this FSB. there was 901 and 1000, i set it to 901.

i had a E2160 and it was good overclocker then this processor. i was able to do a 2.60 at default volt.

if you want the full details of the bios overclocking settings pls let me know.

PangingJr · May 13, 2008, 03:12 AM

what is the highest CPU FSB you have ever overclocked on this CPU,
and what was the Core and NB voltages you were using for the overclocked ?

if the CPU takes a whole lot of vcore to be able to get a decent overclock speed, then either the CPU just not a good overclocker or the system board has a large vdrop problem.