I was looking on ebay before and from the looks of it pci based processors for pre g3 machines seem to be alot cheaper- would it be possible to drop one of these in a beige and make it run as a dual core?

I'm not 100% sure but my mind certainly leans to a no on this one. Besides, performance sucks in PCI CPU upgrades. Yes you can buy up to G4 700-800MHz upgrades for PCI but it will run about the speed of a G3 300. They are cheaper for a reason.

Here are 3 brand new options for you: http://eshop.macsales.com/MyOWC/Upgrades...s=Show+Upgrades
2 of them are below $150 and will give you MUCH better performance than a PCI CPU even if it did run.

You can't use a PCI upgrade card in any machine other than the machines listed:
Power Macintosh Series 7300, 7500, 7600, 8500, 8515, 8600, 9500, 9500/180MP, 9515, 9600, 9600/200MP
Workgroup Server 7350, 8550, 9650
Daystar Genesis and Millennium Series
Mactell XB-Pro
Power Computing PowerTower Pro*, PowerWave
UMAX J700, S900
The term "PCI" does not refer to the slot the upgrade goes in, it refers to the line of Macs that used PCI slots ( as opposed to the older nubus slots ).
The PCI upgrade card actually fits in a special "daughter card" processor slot.
It will not function in a Beige G3, Blue and White G3, or any of the G4s.
Sorry.

If I were you I wouldn't waste the money on a Beige G3, because the system bus speed is so slow, 66mhz .
I had a G3 iMac at 333 MHZ, and the thing was just slow doing anything but simple things in OSX. However, in OS9 the thing was flipping fast! I then maxed out the ram and threw in a G4 466 MHZ processor. Honestly, the iMac didn't run any faster in OSX. I then sold that and bought a G3 500 Pismo, and it had a 100 MHZ system bus. The thing could literally run circles around the upgraded G4 iMac.
I now run a $15 B&W Powermac G3, that I stuck more money than I should have into it. I bought: a Radeon 9200 128MB for $100, maxed out the ram for about $ 70, and bought a G3 1 GHZ zif Processor upgrade for $150 (this is cheaper now). All of this with shipping was around $425. It runs pretty good, but somethings it continues to be ridiculously slow at, *cough* iphoto *cough* . I probably should have put the money towards a mini or a G4 PowerMac.

I don't exactly know what you want to be able to do with this computer, but it will most likely run slower than you expect it to. My Powermac G3 1 GHZ can't even run videos off break.com without stuttering. On paper the computer may look good, but it probably won't run as well as you want it to.