there are ramblocks of 3 bgamodules each at the top and the right approxximately 15mm from the 53*53mm. these blocks measure 55*12mm. their middle is not aligned to the middle of the core. the top ramblock is 3mm more on the left, the right ramblock is 5mm to the bottom. additionally there are two 45° rotated rams at the top of the card to the left and right of the upper bgaramblock. the left one is a little bit lower than the right one.
i am too lazy to make a sketch right now. another thing that hinders me is that i have a small commercial shop in germany for waterblocks, so homebuilt blocks are not directly good for my business. I like homebuilt blocks because mine aren't so different either (cnc-milled but handpolished, blastet, mounted in very small series) but i don't give copies of my plans away for free before i released my waterblock based on these drawings which i measured and made myself
my advice: take a good highres scan of a x1800xt card if you have none to measure with a caliper and scale it to the right 53.5mm between the holes on the screen ans measure there. the accuracy isn't enough for the positions of the holes but its good to see where the rams sits +-1mm. x1900 is the same:
http://www.ixbt.com/video2/images/re...scan-front.jpg
http://www.ixbt.com/video2/images/re...-scan-back.jpg