Hmm I'm doubting you can run the 5th monitor. Generally having a discreet card more or less disables the mobo VGA output. I guess maybe get 4 monitors and try 3 on GPU, 1 on mobo and if that works you'll be good to go. But remember if you do that and it works, the monitor hooked up on the mobo will basically be a separate entity. It won't benefit from the GPU, and I really don't think you can extend desktop to it. Bear in mind this is just educated guessing... but I don't think it'll work too well.
ok i figured it out....
step 1) buy parts
s2) build sever
s3) install OS
s4) install VMware
s5) hook up 4 monitors
s6) start up 2 Virtual Machines on 3 of the monitors and use the 4th one for Statistic of the Server
thier i now i have 6 clients in 1 server.. ^^ great ill slipt each server with 3.75 ram on each ^^