...
HOLY JEBUS!!!
Thanks for the info
notbatman, I've been missing out on big MH/s.
Going to try this ASAP and let you know if this has boosted my MH/s. Hopefully I won't have heat issues as am running full cover liquid cooled cards

Many thanks
Somebody said Windows might not like more than 5 GPUs without some fussing about, just heads up on that if you use that OS. Also my HD7990 is an AMD reference card.
Hey notbatman,
So i set it up and this is what I am getting:

Does that make sense here is the bat file details,
@echo off
setx GPU_FORCE_64BIT_PTR 0
setx GPU_MAX_HEAP_SIZE 100
setx GPU_USE_SYNC_OBJECTS 1
setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_SINGLE_ALLOC_PERCENT 100
ethdcrminer64.exe -tt 30,30,30,30,30,30 -mclock 1245,1245,1245,1245,1245,1245 -cclock 1024,1024,1024,1024,1024,1024 -asm 0 -esm 0 -epool eu1.ethermine.org:4444 -ewal 0x701fb173E3765aA487CCb6C0C7a171A08bB66C51 -epsw x -eworker Beast -dcri 7
I haven't made any changes to ANY other file in the Claymore folder not even the config.txt file.
Also my 7990's show up as Radeon 280X, is that normal

Please let me know where I am going wrong.
Any help is appreciated.
Thanks
You can't get 150MH/s on ETH or ETC the DAG is too big, you have to mine UBQ, EXP or MUSIC. If you want ETH you'll have to exchange the coins.