Overclocking a prescott 3.0e

[waddupmm]

Hi, been reading through some thereads seems like you guys help eachother out a lot, rite now im running my 3.0 and 3.3 I wanna get it faster any suggestions on how do this, I also have corsair xmx pc3200pro 512 mb, and an aerocool heatsink with a 4800 rpm fan mounted on top, thx in advance

[RangerXLT8]

To start we need to know what kind of mobo you have. Set your agp\pci to 66/33. Set your VDimm to 2.7 or 2.8. Then notch up your FSB in 1-2 increases and test for stability. When system becomes unstable, up your Vcore just a tad. You also want to manually set your memory timings. Disable spread spectrum. Watch your cpu temperatures :mad: as you up vcore, you up temperatures. Post back with any questions, also your mobo type.

[waddupmm]

I got an abit ai7 with latest bios 18 my memory timings at 3-8-3-3 agp pci is 66/33 havnt messed wit that stuff should I? Dont know where spread spectrum is :x

[Dcasole]

waddupmm
In your bios you will see an option labeled " Spread Spectrum . Disable it

When you raise your FSB sometimes your AGP/PCI will also raise so you need to go back and lowerer it to 66/33 ( or the closest you can get as some boards will only alow you to set it at 67/34 when overclocked)

Before you start overclocking that Prescott what are the specs on your Power supply unit ??
Look for a label on the side and tell us the amps for the +3 , +5 and +12 volt rails

You can do some damage if this unit is not big enough for a prescott

Also as Ranger states you need to watch your temps as prescotts run hot :mad:

See my signature for some tips if this becomes a problem

Becareful and do not go crazy with raising the VCore !

Being a newbee I would not go above 1.5V with a prescott ( post your specs before raising it so we can be sure your system will handle it)

Good Luck and let us know the answers so we can help
Dave

[waddupmm]

Still cant find the spectrum, but on the side of my psu it says v= +3.3v +5v + 12v, its just some random psu that came wit my case but on my 2.53 i could easly hit 3.1 so :X

[RangerXLT8]

How many watts is the psu? Your new prescott is gonna suck up more power than your 2.53.

Dave helped me OC my pressie. :attn:

[waddupmm]

God, I jus took off my heatsink, and there was like these green crap all over the copper fins everyone was like caked in it no idea what it is but it wont come off, i just installed stock heatsink and ive seen a 10c drop in temps :X

[waddupmm]

This cpu just wont overclock, even at temps of 41c it cant it past 3.3ghz no matter what, ive tried adjusting cpu voltage ddr voltage nothing works cant figure this thing out it has to be either my 300watt pos psu or this chip is fuked

[Dcasole]

waddupmm, With a 300w PSU you might not get far with a Prescott and I would not recommend trying to overclock it any farther than you have got it allready

As I stated before Prescotts are power hogs

You need at least 22amps on the 12V rails

This board has many posts were members have " Blown Up" their "under powered" PSU units trying to overclock a Prescott

If you want to go farther you really need a bigger unit.
The smallest I would purchase is an antec " True Power 430 or 450

"Spread Spectrum" is in your bios setup . On my MSI board it is under " Frequency/Voltage tab. If it is not there on your board check the other tabs as I can assure you that you have it and it is enabled .

If you can't find it tell me what board you have and I will look it up for you .

Once you get a bigger PSU post back and we will help you with the other settings that you will need to get higher than you are now

Dave

[RangerXLT8]

I second that. I had a Antec SmartBlue 350w and it was not cutting it. I upgraded to a Antec Truepower 430w and waa-la. Get a better PS.

Good Luck
Bo

[waddupmm]

Will do ill go get a bigger psu on fri, any btw I have an abit ai7 thx for all the replys guys

[jouyang]

Waddupmn,

I am running my 3.0E@3.9ghz. I can actually run it at 4ghz but with v1.565 in order for it to run stable. If you want to oc a Prescott, you would need to get a nice Power Supply and I highly recommend OCZ 520 because it's rock solid. see my sig for 3.0E detail

~joy

[Baalzevuv]

Waddupmn,
I am running my 3.0E@3.9ghz.


Water cooled or air?

[jenko]

Try putting your memory at a 5:4 divider instead of 1:1.

[waddupmm]

Ill try running my divider at 5:4 when i get my new psu cause ill have to oc quit a bit to get it to even run at default speed

[jouyang]

Water cooled or air?

air with zalman 7000cu, it's in my sig.

[waddupmm]

Jus cashed my check and going to get my new psu, but 1 quik question what is cpu throttling should it be at .50?

[Dcasole]

but 1 quik question what is cpu throttling should it be at .50?

waddupmm, This is a tough question as the prescott employs "Dynamic VID that sometimes is confused with " throttling"

In a nutshell , Intel chose Dynamic Vid in an effort to try and control the heat. Without getting to technical what it does is vary the Vcore up or down according to load . you can read more about it here

Dynamic VID explained (http://www.iamnotageek.com/a/8-p1.php)

This is why it is so important to be conservative when raising your Vcore with a Prescott . MSI chose to lock the vcore down in some of their boards because of this feature

Prescott Dangerous Tweeks (http://www.hardocp.com/article.html?art=NTg5)

Dave

[waddupmm]

Got my new 500 watt psu, tried to oc my cpu to 900fsb not stable at all.. Guess its just as far as my ram could go but I thought I would be able to get a little farther since i spent 150 bucks but im running at 3.6 ghz with a 5:4 ratio ram is only runnin at 394 mhz 6mhz under default speed, had to bump my vcore up 2 notches to be stable, gettin a temp of 47c which isnt to bad I suppose, i guess ill have to get rid of this stock heatsink get a better one, ill try and see how far I can get it to go without blowing my comp up :)

[RangerXLT8]

A 600mhz Oc is pretty good. Is it stable at 3.6?

[waddupmm]

Well I wouldnt call it stable it boots windows with it but when I run prime 95 I get these damn errors sayings its 0.5 expected 0.4 or somethings like that, and its kinda strange when I overclock comp seems slower to me not faster

[Dcasole]

gettin a temp of 47c which isnt to bad I suppose,
Is this at idle or under a load?
i guess ill have to get rid of this stock heatsink get a better one,
Dont waste your money . Check out the link in my signature as it is my case .It does not matter what kind of heatsink ( using air) you have , if you don't feed it cool air you will not see any changes
A prime example of this is my system . When I first installed my prescott I had idle temps of 60C and load temps of 70c
I added the duct mod described in the link and my temps dropped like a rock using my stock HSF unit that came with the chip!
Inseach of even lower temps I purchased an SP-94 and a 92 MM panflow and did not absolutely no diffence in temps
My point is like I said above , if you feed the stock unit cool air and are not going crazy with your Vcore then you should be fine

Well I wouldnt call it stable it boots windows with it but when I run prime 95 I get these damn errors sayings its 0.5 expected 0.4 or somethings like that, and its kinda strange when I overclock comp seems slower to me not faster

It probably is running slower as Dynamic VID might be kicking in

Were you able to find the "Spread Spectrum' setting in your bios and disable it yet?

Do you have performance settings ?? IE turbo, Fast, Slow???

Do you have your memory set to 2.8V?

If so back down the FSB in small steps until it runs stable

Dave

[waddupmm]

Yep got my memory set to 2.8v, no I am almost positive my bios doesnt have a spread spectrum Ive looked everywhere, and it runs stable when its idle doesnt restart or anythings its just when I goto to do a torture test with prime95 it wont even start I jus get that error then temps vary from 45-47 and idle, No I have my settings on auto not turbo, f1 or none of that crap, and 1 more thing I dont know if this is a big deal or not but my cpu-z doesnt have performance mode enabled for my ram, or show my cpu voltage.

[RangerXLT8]

Edit: I didn't read that last sentence of your post about cpu-z not showing your vcore, I'm stumped. :bang head I'd get that corrected before doing anything else.

I've had the same error in prime95 and I found that by rasing the vcore by .125 did the job, but I want to caution you before doing this, do everything else that you can and make sure your temps are not to high. Personally I think an idle over around 42 degress is too high. Heat is your worst enemy. :mad:

[waddupmm]

I got a vcore 1.525 cpu running at 1000fsb 3.75 ghz ram runnin at 200mhz with a 5:4 ratio, lets just see how it runs when my house heats up 2morrow afternoon

[waddupmm]

Changed settings seeing as heat had a great effect upon the cpu, im now running at 3.56 ghz ram is runnin at 270mhz (pc3200) and the reason cpu-z doesnt show my cpus voltage or brand ids is because my motherboard doesnt support 3rd party applications like that =/ but I guess a 500mhz overclock is still good with stock cooling

[jenko]

Seems like most people get there 3.0@3.6ghz 240fsb on air cooling without any voltmods including me.
Memory performance mode only works when you run 1:1 as your using the 5:4 it gets disabled.
It may be worth loosening your memory timings and seing how high you can go 1:1

[waddupmm]

Well I have to adjust my voltage to get to 3.5 Ive tried so many differant settings to get to 3.6 I have to put my voltage way up, but im running at 1.43 volts at 3.5 and I've tried all the way up to like 1.56 without noticing a differance, and I took off the 5:4 divider and my pc3200 is running 234 mhz and I know the memory isnt bad cause I let memtest86 go for a few hours and had 56 passes with 0 errors, I have my timings at 3-8-3-3 any suggestions?

[waddupmm]

And I cant boot windows with default voltages at 3.5 ghz it just wont prime 95 without giving me some dam error talking about 0.5 expected less than 0.4