same kind of issue on the G1 (3 fans model).. but yep, i guess its VRMs under it
Yeah G1 1070s have the worst fans I have ever dealt with. 10 cards and all the fans died within 6 months meanwhile I still have 750 Ti's recently retired after 3 years with fans being in mostly good condition.
The ebay replacements were even worse (no surprise there) and Gigabyte refuses to sell replacement fans (and the warranty procedure would take 1-2 months every 6 monsth of working).
I have some 120cm Noctua fans on the way I'll be experimenting with once I get them.
The fans on the Gigabyte 970s were the second worse, all crapping out in a year - year and a half.
But they are all crappy sleeve bearing and now I have AORUS 1080 Ti's which finally have double ball bearing fans so we'll see how long they'll last.