Are the 5870's the same? I thought all the DVI Ports on ATI cars would be Dual-Link which support enough bandwidth for 120hz, you would only then need 1 Active Dual Link Display Port to DVI adapter to run the third monitor, I think...
I'm all very confused by this

I'm doing some googling but everyone has different answers, I would have thought the DVI ports on the 5,6 and 7000 series would both be Dual-Link and support 120hz at the same time meaning you only have to worry about the Display Port connection in which Gibbo mentioned above you need an Active Dual-Link DVI converter to support 120hz.
I'm still tempted myself to go for a set and just run Eyefinity at 60hz for now as my 5870 wouldn't be able to run much in 3D/120hz at that resolution anyways. So my plan is:
- Have my centre monitor linked up normally as Dual-Link DVI from 1 of the DVI Ports
- Have the right monitor with the sae setup as above
- Have the left monitor running at 60hz for now (budget option) with a Single-Link none powered DisplayPort to DVI converter
- Setup my single screen profile in CCC to run at 120hz
- Eyfinity setup in CCC to run at 60hz across all 3 monitors
- Then maybe dual monitors (centre and right) to run at 120hz
- Few months later when I have the funds replace the Single-Link DisplayPort to DVI with an Dual-Link for 120hz Eyefinity.
If I'm totally wrong could someone please let me know? I'm fairly clueless with this and the internte isn't providing the clearest of answers! I'm pretty sure OCUK can.
TL,DR
Are
BOTH 5870 DVI Ports able to run at a 120hz simultaneously? And can
1 Active Dual-Link Display Port to DVI with the DVI Ports run Eyefinity at 120hz?
PSSST Gibbo do some testing for us