I am about to swap the fan on the ATI X1900 as it is too loud for my needs. I have not taken the card out yet but I estimate you get 5mm between the card and the case. The problem is that the "X1900" sits at the bottom of the mac and there is little room underneath the card for bolts or braces that come with the coolers. Many cats have used the "Artic Cooler2" and are happy but some are not. To be safe I would like to exuast the heat with the Jetart "VC3600"... http://www.cdrinfo.com/Sections/Reviews/Print.aspx?ArticleId=17269 http://www.guru3d.com/article/content/356/8/ http://www.xsreviews.co.uk/reviews-47-page6.html Q: But will there be room underneath the X1900 to secure the screws and can I plug it into the 3pin on the X1900? QPTION 2 Q: If not, how about using the "ArticCooler2" with the "Jetart VC1000" to improved air circulation so I can sleep at night? http://www.xsreviews.co.uk/reviews-43-page4.html http://www.overclockers.com/articles1347/index.asp Q: But can the "VC1000's" 4pin be pluged into the mac pro's board? The conections dont look right to me. This is the 1st time I have modified any part of the mac pro and so I want to get it right. Please can anybody shed some light?