...
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:
http://imgur.com/a/KrGGQDoes 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
http://imgur.com/a/M8edoPlease let me know where I am going wrong.
Any help is appreciated.
Thanks