Bad Axe 2 w/ crossfireX?

Hey guys,
I have Bad Axe 2 mobo for about 2 yrs...
Due to my limited budget, i recently got 2 3870s to crossfire.
I was impressed, although my cards run @ 8x pcie each
according to ATi's website, bad axe 2 supports crossfireX...
is that crossfireX... talking about 2 x 3870x2s??? or does it support 3 x 3870s???
bad axe 2 DOES have 3 x pcie 16x slots, but it ONLY runs @ 8x, 8x, 4x
i was trying to put my old x1900xtx on my bad axe 2's third pcie slot..
to clear my statement... i want to have one monitor for my crossfired 3870... which works now...
and i'd like to add one x1900xtx for two monitors... so total of 3 connection.
so i can have three monitors hooked up with two different videocards.
anyone know if it supports this way?

thanx for any input in advance...

here's my spec:
Xeon x3210
Bad Axe 2 i975x
4 x 2gb patriot pc6400
2 x ati 3870 crossfire
ati theater 650 pro
x-fi platinum
pc p&c 750W
2tb hdds