~misfit~ wrote:
David Maynard wrote:
~misfit~ wrote:
I'm running a Tualatin Celeron 1.3Ghz in a Gigabyte GA-6VEM-L
integrated mobo. It doesn't have BOIS setting to change between
66/100/133, or switches/jumpers from what I can see. It seems to get
the default FSB speed from the CPU and it then allows you a certain
overclock (in BIOS) from there, in pre-determined steps
unfortunately, I can't go one Mhz at a time. Well, my 1.3 is running
24/7, Prime95-stable at 124Mhz FSB for 1.612Ghz. I'm pleased with
that, it has a copper-bottomed HSF on it that came with a Barton and
stays cool, Also I removed the IHS so the die is in direct contact
with the HS. There is no way in BIOS to adjust vcore, however this
CPU has always ran a little high, 1.53 average according to MBM5,
ranging between 1.51v and 1.54v. (Strange because I had a Celly
1.4Ghz in this board last week and it only ran at 1.35vcore. It ran
fine though, however I didn't try to OC it at that low a vcore. Both
have 1.5v written on them)
I've noticed odd Vcore values with tualatins on non-tualatin
motherboards
as well but it's not a problem here as I always have something else
setting it.
It's a strange mobo. The manual claims it supports "all new Pentium III
processors (FC-PGA & FC-PGA2 package) and Celeron processors in FC-PGA
package. Supports 66/100/133Mhz system bus"
Note it doesn't say anything about FC-PGA2 (Tualatin) Celerons. However it
is running the last BIOS release (F8).
The tualatins using an open drain FET to set the Vcore identification
pins whereas the earlier celerons used straight wire shorts to
ground. And the specs for earlier tualatins specify the motherboard
pull up to be 10K, or more, while the tualatin says 1K. I could
imagine that the 10K "or more" pull-up on the non tualatin
motherboards is not always sufficient to drive the pin high when it's
not being pulled low by the on-board FET.
Which would be a great theory except for not explaining why yours
seem to
be 'high' instead of low, as that theory would expect. Unless the
on-die
FET pull downs depend on some Vss pin that's 'unused' on earlier
motherboards.
Whatever the reason, I've seen it too.
Thanks for the explaination.
Well, since yours says it's made for tualatins that pretty much shoots both
theories to hell, don't it? LOL
|