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Rx 480 Nitro 8GB - drop h/s - Solution ?

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Hi all im rly tired to try fix my problem but meybe someone have this and he find the solution. Problem is:

My rig:









Over 6 moths i mining XMR. Take 4350 h/s witl 695/710 wats at wall.

Use Vdrop+.Rom From this Link: [url]https://forum.ethereum.org/discussion/9650/sapphire-rx-480-nitro-oc-8gb-11260-01-20g-modded-bios-29-mh-downvolt#latest[/url]

Windows 10 x64
Crimson 16.6
AMD SKD

All standard settings.

After that i try to chenge for ETH or Zcash and start problem.

When i change for ETH all times the same card make error. When i start miner start normal 29+ and goind down till 0 and system crash after rebot windows msg - watman reset after system failer.
The same with zcash. maximum time miner runing 5/7 mins. when i change mbios key to OC 1340-2000 all works with nice result but ... eth 175 mh/s - 1350 WATS /// Zcash 1900 k/s - 1250 WATS is to much






When i go back to XMR Silent-mod vdrop+ 4350 k/h - 700 WATS all good.

I try to :
change Drivers - no help
reflash rom - no help
copy rom from other my card and flas to this wich make problem - no help
change riser, usb , power cable - no help ?

There is posible card i broken ? when i flash stock rom to her .. she work but result a litle low jak others. but not crush. When instal the same rom wich i have at my other 5 cars .. always problem. Did i should put to warranty ? or what ?

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