Radeon 5870 hd triple screen doesnt work even with adapters

im trying to see what 3 monitors looks like but i can only connect 2 at a time when i try to go for
3 monitors it will just not let me enable it .

my setup is windows 7
cpu i7 920
9 gigs ram
ATI radeon hd 5870
rampage formula 3 motherboard asus
coolermaster 750 w power supply

the 3 monitors are
acer h233h
samsung syncmaster
sdm-hs75p sony ( as the middle monitor )
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