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Claymore - Possible bug.

With 10.2 Beta I am getting incorrect shares on my two Gigabyte 270 OC (Pitcairn) (non X)

I'm using the stock settings (-h 512) on non-overclocked cards. 9.7 did/does not give incorrect shares.

For me, this miner, for the old cards type 7850(1,2gb), 270(x), 280(x) is totally unusable, unfortunately. 15-30% less hash from clay9.7 version and too manny low diff share.

I spend 40 hours of my life trying to install it properly that at least I get at least the same hash rate, but , it's not worth it. 7850 with 1 GB of memory and 7950 remain on clay9.7, the rest on kachur miner

My two 270s get 422 and 456h/s respectively when I engage the overclock settings. No other miner provides me with anything near that.

I have the same gigabyte cards.

9.7 provides me with better hashrates. 860h/s between my two 270 versus 840h/s with 10.2. I'm not running blockchain drivers though on this particular computer, I use this workstation for photo/video editing and I don't know how much the blockchain drivers will affect performance for that.

xfx and msi 270x, claymore 10.2 show me a lot this message:

GPU0 found incorrect share. If you see this message often, make sure you that you did not overclock it too much, also try to reduce "-h" value.

i ran a test for the msi with everything in stock -h 512 and get this results:

15:46:07:999   10a4   GPU #0: Pitcairn, 2048 MB available, 20 compute units
15:46:07:999   10a4   GPU #0 recognized as Radeon 270/270X
15:46:07:999   10a4   card 0, m1 2048, m2 1791 w 160
15:46:07:999   10a4   0 m = 2
15:46:08:421   10a4   GPU #0 algorithm ASM, -h 512, -dmem 0 (Memory used: 1075MB)

16:13:16:690   12a8   GPU #0: Pitcairn
16:13:16:690   12a8   XMR - Total Speed: 449 H/s, Total Shares: 115, Rejected: 0, Time: 00:26
16:13:16:690   12a8   XMR: GPU0 449 H/s
16:13:16:690   12a8   Incorrect XMR shares: GPU0 16
16:13:16:690   12a8   1 minute average XMR total speed: 446 H/s

with -dmem 1 the miner drop the hashs 376 Hash/s

with the v9.7 the hash with -a 4 was 445 H/s - 461 hash/sol max

i still going to check options for this two r9 270x, if anyone like share any results for this card

I switched back to using 9.7. While I got a 2% increase in hashrate, it was pointless because I had an incorrect share rate of 12-15%, no matter if overclocked or not. I'm just waiting patiently for 10.3/11. Though it would be nice if Claymore reduced the rate in 9.7 to be in line with 10.2.