@nowaltcoin, your sgminer-gm settings wrong and your speeds for your cards are too low.
On 270X 4Gb on Claymore 9.7 I have 495-500 h/s, sgminer 515-520. Claymore 10.2 with dmem 1 gives 530 h/s but too many incorrect shares. Without dmem 1 10.2 gives only 485-490 h/s.
On 280X(7870) on Claymore 9.7 I have 695 h/s, sgminer-gm - 675 h/s.
Try on 270/370 and other analog cards with sgminer xintensity 460 worksize 8 gputhreads 2.
i dont think so!
This may work stable for your 4GB Cards, but keep in mind I'am using only 1/2GB Cards.
If you look into the physics of the cards (numbers of Shading ClustersROP/TMU/ALU) you will see the right numbers!
for a
HD 7790 1Gb (max stable working) rawintensity 196 with 2 Threads and rawintensity 224 with 1 thread (you can play with the worksize)
HD 7850 2GB (max stable working) rawintensity 256 with 2 Threads and rawintensity 512 with 1 thread (you can play with worksize)
R9 270 2GB (max stable working) rawintensity 400 with 2 Threads and rawintensity 640 with 1 thread (you can play with worksize)
you can see these limits (lack of gpu memory) with Claymore 10.2 ! on these cards
HD 7790 Claymore 10.2 is not running (missing asm)
HD 7850 2GB with -h 512 dmem 0 (1075) with -h 512 dmem 1 (more than 2GB !!)
R 9 270 2GB with -h 512 dmem 0 (1075) with -h 512 dmem 1 (more than 2GB !!)
and after all you can not use all of the gpu memory you can use only up to 1791 MB for the 2 GB cards!
have a nice day
