The X800XT has one DVI-DL and one ADC port. You can only run one dual-link DVI output off of it, even with an ADC-DVI adapter. The 30" ACD requires a DL-DVI connection to run at native resolution, so you're out of luck with it if you want to run two. Your best bet for two is either a Geforce 6800 DDL (GT or Ultra), or a flashed PC card. I'd just grab a 6800--they're less than $200 if you look carefully.