Mac Pro Unofficial Upgrade issue

So I have the Mac Pro 1,1 with the upgraded graphics card (ATI Radeon 5770) and followed all the steps from upgrading from the max OSX to El Capitan with an official copy of El Capitan installer off another Mac and used the EFI boot thing or whatever it's called and got over and fixed the system files to make it work correctly. It works great a lot of the time but sometimes it randomly just crashes and restarts. Running I believe 8GB or more of ram (haven't been on it in awhile) Any tips or advice to stop the crashing would be appreciated! And if you need more info just let me know.

submitted by /u/maniac_chris
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