Getting incorrect shares even when clocked down to 1000mhz

[iamnoobplzhelp]

So, I have this one card, it might just be bad.
It's a PowerColor Red Dragon RX 480 8GB. 69.8% asic quality in GPUz.

It's stock clock is 2000mhz... seems normal right? Start it up... it's giving me bad shares... but no gpu errors in HWINFO.
Okay, fine. I downclock to 1800.. Still giving bad shares. No errors.
I downclock to 1000. STILL GIVING ME BAD SHARES!

I'm mad at this card...
I tried going back to stock bios
Tried new risers
Tried a different slot

Still gives bad shares.

It does, however, get a correct one every once in a while. I'd say, 1/5? But the rest are incorrect.

Anyone have any clues?

[grchina]

Delete dag file

[iamnoobplzhelp]

2/3 of the shares found with this card are invalid. Not sure what's going on.

Stock bios, underclocked, overvolted, doesn't help. Probably just a bad card =(