PeepingTom

Ok, for everyone who has the same troubles as i do...forget about the post with the multiplier bug... What i wrote above is abviously wrong. I was so desperate, that i tried every option and every suggestion i found in the web. And this thing written in the gigabyte forum, about that bug, has nothing to do with ds4 boards. I wanted my problems to disapear...but that was not the solution.
When you take a look at the numbers in bios, it is clearly obvious, that the "A" multi is the wrong one for a q6600 clocked to 333mhz.
I checked the numbers that appear with different multis.

my clock was set to 348mhz with a multiplier of 9x and memory multi 2.50A. Cpu was on 3.13mhz with memory on 870mhz...

Now with the "B" Multi everything looks a bit better.

Clock set to 350mhz with a multiplier of 9x and memory multi 2.40B.
Cpu is on 3.15mhz with memory on 840mhz.

It just looks smoother... 350, 3.15, 840... For me, this is the evidence, that the post above has nothing to do with the x38-ds4 board.

What i did now is, i unplugged the gpu fan from the mainboard and pluged it directly to the psu with a adapter cable (4pin to 3pin molex) and controll the fan by fanmate.
Since i did this, i feel like the pc is booting smoother...the bios splash screen for ex. is coming up much faster.
Cause as i wrote above: before i pluged that gpu cooler on the mainboard, i never had trouble...and i used the "B" multi all the time.