So now I'm back to having all the 3 cards installed and only the 7750 produces verifiable hashes.
I've now tried every driver from 12.6 to 13.4, including beta drivers.
The problem is with one or more files in the SDK.
The first time i set up all this everything worked with 13.4 and SDK 2.5.
As soon as i uninstall the SDK, programs stops terminating unexpectedly, and only the 7750 works for some reason (it shouldnt work at all, should it!)
I'm just baffled now.
Everything else works, the 6870 performs great in regular DX or GL. Just the OpenCL/SDK is somehow FUBAR.
Topic: Suddenly getting verification errors (Read 546 times)
I'd buy a new power supply and try that.
Otherwise I'd say there could be a problem with the cards themselves, but it seems really unlikely for both to suddenly have the same problem.
Otherwise I'd say there could be a problem with the cards themselves, but it seems really unlikely for both to suddenly have the same problem.
Yea this is strange im not sure.
Good luck getting this solved.
Are all 3 cards in the same computer (the 2 bad ones + 1 good one?)
Well, I removed the 7750 to try the 6870 and 6450.
Last week I had all three cards in at the same time and they all worked.
Right now just the two 6xxx cards are in and none of them work.
I cant mine with the Geforce card i have there too (i never mine with it normally, but it always worked before). Something must be wrong with my software.
weird problem goin on
Yea... I dont know about this
Are all 3 cards in the same computer (the 2 bad ones + 1 good one?)
Well, I removed the 7750 to try the 6870 and 6450.
Last week I had all three cards in at the same time and they all worked.
Right now just the two 6xxx cards are in and none of them work.
I cant mine with the Geforce card i have there too (i never mine with it normally, but it always worked before). Something must be wrong with my software.
there is a switch on your wall thats the first place i always go 
Try removing the card from the motherboard and firmly reseating it.
tried that
Are all 3 cards in the same computer (the 2 bad ones + 1 good one?)
Still having this problem?
Why ask after you just wasted the time to post
Idk sorry
Try removing the card from the motherboard and firmly reseating it.
tried that
Cards that was produciing good shares a week ago does now suddenly not working anymore. (a 6870 and a 6450). I get verification errors, 'check your hardware'. Whats up with that ? 
My 7750 works though. Strange, yes? I am using driver 13.4 and SDK 2.5.
My 7750 works though. Strange, yes? I am using driver 13.4 and SDK 2.5.Try removing the card from the motherboard and firmly reseating it.
Cards that was produciing good shares a week ago does now suddenly not working anymore. (a 6870 and a 6450). I get verification errors, 'check your hardware'. Whats up with that ? My 7750 works though. Strange, yes? I am using driver 13.4 and SDK 2.5.
My 7750 works though. Strange, yes? I am using driver 13.4 and SDK 2.5. Jump to: