Hi im new to bit mining and i am running dual MSI 6990s and they run at 333.33 mhash/sec per GPU which gives me the total of 1332 MHASH/SEC. Is this normal?? I want to try an overclock it as well, can anyone give me tips on how to do that and what rate should i be going at per card or per GPU??

oh btw im also running my SAPPHIRE 5770 1GB on another computer and it only gives me 125.66 mhash/sec. On the wiki it saids i should be going at 156.83 at core of 850. what am i doing wrong?
C:\Users\Username\Desktop\phoenix\phoenix.exe -u username:password@deepbit.net:8332/ -k poclbm DEVICE=0 VECTORS BFI_INT AGGRESSION=8 WORKSIZE=128
666 Mhash/s is normal for 6990. You can see it in the "Mining hardware comparison" page of the wiki. About overclocking I'm not sure you should try it if you ask such questions... 1.3 Ghash/s is a good speed afterall. But if you really want to overclock your cards, go ahead, download msi afterburner and give it a try (e.g. set 850 mhz for core)... And try to use the forum search next time.
About 5770:
What SDK do you have? If it's 2.4, use -k phatk, not -k poclbm.
Why didn't you stick to the recommended miner settings written in the first post? Remove "WORKSIZE=128".