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I've modded them before, with the exception of the sapphire. I definintely gave it a bad flash, been trying to flash it back but am having issues at boot with Atiflash. Just gonna run 5 on that one for now, and hook the sapphire up to my desktop until I flash it back

Sounds rough, I think there are more complicated ways to reflash bios that you may want to explore... I'm not sure what that card was mining at but I can give you a rom that mines at 30.X and some DCR for a non-nitro 4gb (I feel like there is a decent chance it would work on 8gb).