Thanks for those advice!! will try
For replacement, I am considering it. but i am wondering if there's successful case from anyone who also owns 6600 xt

I usually see posts about successful cases of 6600 xt with hardware acceleration and sleep working, but seems there's not much sharing some outcome for hibernation. i know hibernation is usually not recommended one to enable on hackintosh by hackintosh tutorial sites asking to set `pmset hibernatemode 0` without reason
Probably it's not that much a necessary in terms of a desktop pc/mac