Thx Jackal!
Unfortunately, the block is VERY flow restrictive, and that's one of the things that will make me ditch it soon. It makes my little maxi jet pump considerably warmer and louder, too much backpressure.
The base thickness is 1 - 1.5 mm, I cannot say more precisely cos I made the channels with dremel, from the hand.
I still got nothing on the south bridge chip, I was thinking of passive hs, but not sure will I keep the mobo or go for a newer one.
Well, back to the drawing board, and I can't say I feel too sad cos of that
Cheers!