setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_USE_SYNC_OBJECTS 1
cgminer --scrypt -w 256 -g 1 --thread-concurrency 8192 --intensity 13 --gpu-engine 1100 --gpu-memclock 1500 --gpu-fan 100 -o http://mining.usa.la.hypernova.pw:9332 -u worker.1 -p xxxxx
I'm not too sure about that card tbh. The BIOS flash is not to put a more up to date BIOS on, but to put a different BIOS on which doesn't suffer from the low scrypt hashrate. As i say this is a problem with certain cards, usually the OC / Ghz editions.. Just to confirm, your card is a normal Gigabyte, not OC or Ghz edition or anything?
Try the following and let me know what hashrate you get: -s 2 --thread-concurrency 20992 -I 13 -w 256 -g 2 With 1040mhz/1081mV GPU and 1500Mhz/1500mV RAM.
*Edit - reading your post more closely, am i right in saying you have an OC edition card? If so then i'm pretty sure a BIOS flash to the non OC version would work.
Also if anyone's interested, my 7970's use about 250w each at these settings.