Help tuning gpus for maximum performance without blowing them up?

Hey All - Based on this, I’m getting some stability now and want to start optimizing for ETH and TON dual mining but I can’t even get these overclocked without crashing simply mining ETH… Can anyone point me towards a good resource on getting these working at their best? I’m contemplating trading the nvidia gpus for some more 6600s and keeping the whole rig identical… Any thoughts, opinions, or info you could share or point me towards that you’d trust would be appreciated in advance… thanks folks

so far, no crashing

the hynix memory cards stink… trying to stablize them then i think im ok… this is fun

I think this is as far as I can push it and not kill something… ill let it run and see how it goes…
Was 315 at 800W-ish
Now 346 MH at 705W