to day i tried install water block on my R600 with ZM-GWB3 and it completed support, from we knew is core of R600 it lowly with edge plate but ZM-GWB3 it have jut plane so it can complete install :)
http://img95.imageshack.us/img95/4063/44760744ee5.jpg
http://img95.imageshack.us/img95/1814/50219064xd9.jpg
http://img95.imageshack.us/img95/1544/94483502cp9.jpg
Full contact between core and WB surface
http://img291.imageshack.us/img291/6056/74241227fb2.jpg
jut surface it higher than edge plate around core
http://img155.imageshack.us/img155/9595/17777143ma1.jpg
http://img221.imageshack.us/img221/1599/28337045hz9.jpg
http://img185.imageshack.us/img185/7827/43708552qt0.jpg
Holding hole is correct
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ps. Sorry for my BAD english :)