HBCC on or off will make no difference . It's simply not used as a feature as per the Dev's comments on the Dev's website, and you would know that if you read anything. People here don't read and just want people to tell them what to do. The reg mods will reduce the power draw to something far more reasonable like 160 to 170 watts. Why pay more in power for the same hash rate?

There is no issue with using Wattman.

edit sorry yes it is the liquid cooled GPU ive just logged on and its still holding hashrate and temps stable at 31/32c
the room in which they are sited is very cold (its my office at work and its freezing lol)

no that I know of. I installed some kind of unlisted version, 0.8.1, that's how appeared in gandalph3000 website, a 0.8.1 download, but the executable is the same size as before. However it might be worth a try, just in case.

http://www.gandalph3000.com/cast_xmr/howto-mine-monero-rx-vega/

Maybe it failed math class? Does it do it if you run it alone?

Request: Add option to cast_xmr to set a timer to stop and restart the miner gracefully.  Alternatively trigger a restart if hash rate is below a threshold for an amount of time.

I've read and seen the scripts to automate this, however would like to request this be added to the miner directly if possible.  Like others, I'm able to get 1900+ h/s per VEGA, however it will drop to around 1550 h/s after some time and stays there.  Lots of things cause this drop and I have found restarting the miner is necessary.  On my setup, I never seem to have to reset (enable/disable) the cards, only restart the miner, to get back to full hash rate.

I am running multiple cards on this RIG.  2x VEGA's with Cast_XMR.  4x RX550's using XMR-STAK.  2x R9 290's and 4x GTX 1060's using Claymore.  Also running XMRig for CPU mining.

I must start all the other miners BEFORE Cast_XMR to ensure full hash.  Restarting another miner will cause Cast_XMR to drop the hash rate instantly.

In lieu of solving what seems to be a driver issue, would like the miner to handle this hash drop internally, either with a timer or a hash rate monitor.

Hope that all makes sense.  Thanks for the work on the miner dev!

Just use free windows 10 problem solved.

Hehe, that was my first thought, but yeah, it cannot be so stupid, can it?? :D

I did try to run it alone, had the same problem... Other cards were plugged in tho, they were just not mining... Not sure how much difference does that make?

Yeah most likely a throttling problem.  Some people run cards in inhumane conditions, high ambient temp, 100% fans.  Pure slave labor conditions.  Those poor GPU's.  No wonder they go on strike once in a while.