I won't ever know this now but I think I was at 1408/1100 @ 905/940mv. Gonna wipe it all and start over yet again. And I still haven't even started on my new to me z420 that I bought to house Vega #2.My vega's crash while otherwise mining ok, mostly due to insufficient voltage. I've had to start burn in testing them at varying voltages as each card is different. One card needs a full 1000mv on both core and hbm to mine stable at 1100mhz. Others can do as low as 935mv on hbm and core. Some need 1000 hbm and 950 core, some the other way around, 1000 core 950 hbm. I test in increments of 935 / 950 / 975 / 1000.
Kind of sucks, my first 8 cards were all fine at 935/935/1100mhz. This last batch, I've had maybe one card that could do that.
If a card stays up for an hour, it's most likely those are stable settings. If it makes it 15 minutes without crashing, but not an hour, then you're pretty close to the voltage you need. And if it can't make it 15 minutes you're pretty far off.
Regarding the addon fans, I mostly agree. It uses a lot of power and makes the systems a real pain to work on -- can't use the video ports. I'm going to try putting 2 gpus in a 3-gpu board and 3 gpus in a 4-gpu board and see how that goes.
God I'm tired of faffing with this.
I bought both of them on Thanksgiving day on Newegg, where would that put me on your Vega lottery timeline?
Still, your increasing voltage idea gives me hope. How do the higher voltage cards do on wattage?