Changing 'default' FSB speed with Tualatin?

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)

Now, 1.61Ghz is pretty damn good I figure. (Even though it's a dreaded Via
chipset board I get 107 marks with CPUMark99, up from 84.9 at 100Mhz FSB).
From what I can tell I can't monitor die-temp with this board. However
socket temp sits at around 29°C, case temp 19°C, crunching SETI full-time,
about the same as the 1.4 did using it's stock HSF. It's winter here.

I'm never satisfied with an OC until I've reached the point where I get
errors in Prime, then backed off to my last stable setting. I can't do that
with this set up as-is. Also the PCI bus is 41Mhz, a setting I'm not exactly
comfortable with although all seems fine. The only card I have in it is an
Adaptec AHA-2940-AU for my old scanner and it's always been a forgiving card
bus-speed-wise, everything else is on-board. (I haven't tried my scanner at
this speed though). The HDD is an old 8.4GB Fujitsu. The board actually has
three bulging capacitors, with two of them leaking a little on top. I have
replacements ordered and they should be here in a few days. I was going to
replace them as soon as they arrived, however, with it running this well I
might just leave them as they are until I *have* to replace them (unless I'm
risking my CPU?)

So, the question: Can I easilly (and non-destructively in case I need to
revert back) fool my mobo into thinking it's a 133Mhz FSB CPU? It does run
133FSB CPUs. That way I could try for 1.73Ghz and have the PCI back in spec.
I realise that there isn't a very good chance of me getting it to run at
that speed (especially with no vcore adjustment) but this *does* seem to be
a good bit of silicon, I'd hate to not try it. I'm sure most of you
understand.

Can it be easilly done? This is my second machine, mainly used for SETI
(BOINC actually) and a bit of 'muling' in multiplayer Diablo2 games.

I have seen a web page with other people's OCs on it, some overclocking
site. Does anyone have the URL? I'd be interested to see how far others have
managed to push their Tui Cellys.

Also, Spajky, what speed do you have your Tui at and how many marks does it
get with CPUMark99 on a BX?

Thanks in advance for the replies folks.
--
~misfit~