I usually just screw into the heatsink fins, that should be okay.  You could also make a plate that attaches to the smaller fans holes then connects to the new fan.  As for the power connector, you can get a molex to 3pin adapter for a full 12volts or run it off of a pci slot fan controller (which I suggest).

I buy Sharkoons from http://www.performance-pcs.com.  I have spoken to the owner and really like that store...its my new place to buy mod stuff.

The other two places are ok too, I have ordered from both.

Neato, thanks! I presume you're talking about this pci slot fan control:

http://www.performance-pcs.com/catalog/i...products_id=494

That's probably a good idea.

Yep, that is the one.  One thing I forgot to mention is that Performance-pcs sleeves pretty much everything they sell.  Even if you find lower prices elsewhere, having the sleeving done is a great time saver and they are pros.  Good luck with your mod and be sure to post some pics.

There is 4 brackets (k7 type, k8 type, LGA775 and P4 478). Which one have you used? Just to make sure the waterblock i'd like will fit.

None of them. The brackets are junk. Heres how I would do it.

Four long screws though the bottom of the logicboard plastic spacers on the screws between the logicboard and the CPU card. More plastic spacers ontop of the CPU card on the screws to the same height as the water block. Then use Pexi-glass or a metal plate to go on top of the water block and tighten some wingnuts on the screws. Or instead of plastic spacers some rubber spacers would work better.

I thought about that... That would comme pretty handy to make my own bracket since this would enable me to fully center the waterblock on the cpu for maximum performance. Futhermore, i have the blueprint for the heatsink, so exact measurement shoudn't be a problem for a custom made bracket.

Now, i just need to find a not too ugly case and select my watercooling equipement.

Be careful on selecting the equipment. Make sure it's enough for what you need.

Pretty much any kit will be able to deal with the heat produced by G4s, even duals.  I used an Asestek kit with 120mm rad on a dual 1.25 OC to 1.42 and it wasn't any better at cooling than the copper Apple heatsink.  It was louder too.  As its not a necessity, I recommend a small kit (or similar parts).  But if you got the dough to go overboard, why not?!

And for your bracket, use springs between the block and the retention nuts.  Thats the best way to get a solid contact patch with out any spacing or overdoing it and damaging the cpu (which I have done, but not before OCing the hell out of it!) >:D

It's true i don't need a super porwerful cooling system. The G4 cpu is about 30-35 watts max at full load. Don't know about my ati radeon 9880 pro thought...  Anyway, it's nothing compared to those 100W pc CPU out there i sometime hear about + the latest graphic card.

Was thinking about using a swiftech Apogee and a swiftech MCW60... Already have a pump i could use until i get more money for a better quieter one. I'm left with the choice for the radiator.... any suggestion?

As far as brackets go there are several brackets included in the kit, but I just used the I-shaped bracket provided.  I placed that on the copper water block, then I placed a plastic piece included that matched the I-shaped bracket and placed it on the bottom of the CPU.  I then put the four bolts in from the bottom up, so the nuts would be at the top to tighten.  If you have the ability to make your own brackets, I would go ahead, but it is possible to mount with the universal I-shaped bracket included with the kit.  The cpu is not centered on the water block this way, but the whole top surface is in contact with the bottom of the water block.  It is really isn't necessary for the cpu to be centered anyway, since it will still get water cooled just fine.  The only hard part of making sure the water block stays flat on the cpu.  Just to clarify, you can get this get from zipzoomfly.com for cheaper that what I posted above.  Hope this helps, thanks.