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Could this be something: http://www.anandtech.com/show/4130/the- ... e-at-190/7 "Though in the name of stability, the launch BIOS has significant issues with turbo boosting, where only a 1x multiplier boost gets applied at any thread loading, rather than 4x/3x/2x. It wasn't as simple as...

Lower to 32x. Gigabyte P67-UD3 B3.

Depends on how you define tinkering. I've been running stable with sleep/OC on 10.6.7 and this was my first build. It wasn't that hard.

Yes, disregard my earlier screenshots. I'm sure in my case Gordo74's guide works.

OK, so it works now. I started from scratch, followed Gordo74's guide and that was the way to get it up and running.

Make that 34, not 39. Anyway, I'm back to the drawing table, it now refuses to boot.

2500K multiplier should be 32, I think mine should be 39.. I am now getting BIOS errors, it crashes during boot at the line saying "USBMSC Identifier", and when I reset BIOS tells me it didn't boot because of overclocking issues. I chose MacPro 3,1 because it was in another guide.. No idea if...

Reboot loop was fixed in my case by setting clock multiplier to 32x, as suggested by Gordo in viewtopic.php?f=79&t=16323&start=0

OK, I got it to work!!! Thanks to another post here. The reboot loop can be fixed by setting the clock multiplier in BIOS to 32x. It now boots from HD! Kernel is 64bit. Still in 10.6.6 though, I'm a bit reluctant to upgrade now that everything works. I ran Cinebench again. It now shows 3.19ghz...

Install 10.6.6 yes, boot from HDD - not directly: I need to boot iBoot legacy from CD and boot from there on. Steps: * boot from iBoot legacy, insert Snow Leopard retail (10.6.3) * type "GraphicsEnabler=no" * install & reboot with GraphicsEnabler=no again * run 10.6.6 comboupdate (which crashes...

OK, Cinebench scores OpenGL 40.14, CPU 6.18. That's 32 bit on 10.6.6 from legacy iboot. Curious to see how much it will improve with 10.6.7 and vanilla kernel..

At least legacy iboot works - just had to enter GraphicsEnabler=no. Full clockspeed (3.39mhz), card is shown as ATI 5000 in system profiler. Haven't tried putting the other 4gb memory in yet. Funny thing - Geekbench crashes when I start it. Now dling Cinebench.. (but I'm already amazed this...

Same issue here on a Gigabyte board and I know it happens on Asus boards, too...

Mmh, just a thought.. I read in another post "Selected restart in 10.6.6 Combo Update installer (not the apple menu restart)" - however, my combo update installer always crashes just before I try to install multibeast. Wonder if one has to do with the other.

That seems to be a known problem, too: viewtopic.php?f=79&t=16046&hilit=reboot+loop I had this with Multibeast 3.3 as well, so it must be a BridgeHelper issue?

As a matter of fact, it does exactly the same as iboot: boots half a second and then reboots the machine - reboot loop.

Actually I managed to install 10.6.6, but not reboot into the working system. It hangs somewhere during boot (described here viewtopic.php?f=79&t=15708&start=100). Removing kexts didn't help. I'm going to retry...

lilaznjocky, type GraphicsEnabler=no at iboot prompt, it worked in my case - didn't need anything else.

And that indeed did the trick, thanks! Now installing. Onto the next challenge ;)