How to get an i815EP b-step board to boot @ VCore above 1,8V with Coppemine?

[Celemine1Gig]

Hi guys and gals,

I have a P3 667 on a MSI 815EPT Pro board that features the i815EP b-step chipset with tualatin support. The Tualatin support is a nice feature, because I'll upgrade to a Celeron 1GHz A as soon as it is released. But my problem now is, that the board can't boot at VCores above 1,8V(it's a cC0 chip with 1,7V defalut VCore and I could select upto 1,95V in BIOS) with coppermines!! I mean, I can select these VCores above 1,8V, but it simple doesn't boot and won't work again until you do a CMOS reset!!
Unfortunately I want to run this chip at 1GHz and I think it'll take more than 1,8V to achieve that speed.
Is there a solution to my problem??

Please help! I think it's a problem of all tualatin compilant boards with VRM 8.5!

[Yodums]

What kind of PSU do you have? You have alot of power devices which can be sucking up alot of juice see if it'll boot if you disconnect somethings that each alot of juice on the boot ie: HDD.

[Celemine1Gig]

Hi, thanks for your reply!

I have a 350W PSU, so that shouldn't be the problem. BTW it always worked @ VCores higher than 1,8V with my old Abit BF6 BX-Board, with the exact same components.
And I know some people with 815EP b-step boards who had the same problem!

[Yodums]

Bios flashed it to the lastest?z

[Celemine1Gig]

Yes every available bios version tested without success!

[Yodums]

I'm stumped...

I possibly dont know what can be the problem...

[jmsandrsn]

VRM 8.5 only calls for voltages up to 1.825V. I know for certain that the ST6 only goes up to 1.825V...most if not all of the Tualatin boards are probably in the same boat.

[batboy]

Are you saying you could get that CPU to run at 1 gig using 1.8v and the same heatsink on another mobo, but not on this mobo? If so, I'd have to say it's a heat related problem. Try reinstalling the CPU cooler using a good thermal paste.

[Celemine1Gig]

I'm only talking about running the CPU @ core voltages above 1,8V(for Tualatin CPUs, voltages are adjustable upto 1,825V in BIOS, but this one is certainly a Coppermine).
Running the CPU @1 GHz which would be 200 MHz FSB is another story, but with this Gigabyte board it's a bit less unreal.

To make it clear:
I could select voltages from 1,7V-1,95V on my MSI mobo, but it wouldn't even boot at anything above 1,8V!
On my Gigabyte board that is now installed, I can only select between 1,025V and 1,8V. I think the guys @ Gigabyte knew why they cut out the options above 1,8V. They must know about the problem.

But what confused me, was that I saw a picture of a Tualatin Celeron CPU running @2,05V VCore on a Elitegroup Mainboard. I think it maybe was a japanese website. Maybe Holicho's site??
That tells me that voltages higher than 1,8V should be possible!

[batboy]

I've been running my coppermine CPU at 1.9v to 1.95v on an Abit SA6-R (i815 chipset mobo) since last spring. The CPU and mobo will handle higher voltages if you have good cooling. Higher voltage and overclocking both conspire to heat up the CPU, that's why cooling gets very critical if you plan on raising the voltage or if you do anymore than mild overclocking.

[Celemine1Gig]

Read first, then post!! I'm talking about b-stepping i815 chipset with VRM 8.5 and not about i815 first revision like on your Abit SA6R with VRM 8.4!! Got it??
Sorry, just wanted to point that out!

[Flu!d]

Celemine1gig....

That's strange....The Gigabyte board must limit max voltage to 1.8 volts on cumine processors because using my Tualatin I have the option to run to a maximum of 1.825 volts....

Hmmmm, you learn something new every day! Never noticed it before because I never pushed my P3 1000EB right up to the 1.8 volt reigon....

[Celemine1Gig]

You see, again one reason to join this forum! *g*

But who cares about the voltage! If I'm lucky, the chip will run @1GHz using 1,8V!! But I think the 200 MHz FSB will be the biggest problem.

[soil]

Originally posted by Celemine1Gig
But what confused me, was that I saw a picture of a Tualatin Celeron CPU running @2,05V VCore on a Elitegroup Mainboard. I think it maybe was a japanese website. Maybe Holicho's site??
That tells me that voltages higher than 1,8V should be possible! [/B]

you mean this one:

http://203.174.72.113/garageoyaji/PartsReorg/PartsReo_Cele12DefUp.html

[Celemine1Gig]

No, it was on holicho's homepage, like I said. But I found out that he did some hardware modifikations to the board, to get the 2,05V. So that's nothing for me. I think I should be happy with the 1,8V!