PC Crashes using 2 monitors on different Nvidia cards

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https://bbs.archlinux.org – Using Arch x86_64Nvidia 450 GTSNvidia 430 GTI have set up one monitor to use my 450 GTS via DVI, and another monitor to use my 430 GT, and they were configured using nvidia-settings for separate X screens. My problem is that occasionally while using the monitor hooked up to the 430 GT (just using programs in general) the whole computer locks up, and I can do nothing but hit the reboot button. I was astonished the first time this happened because that has never happened to my while using linux. I have a hunch that this may be related to the card itself because my brother was having trouble with (HowTos)