Hi. The situation is as follows:
I have 3 VGAs. Peak performance is 6950(326 MH/s), Asus 5870 (461 MH/s), Gigabyte 5870 (431 MH/s)
When a single card is mining (6950 for example) everything is ok with its hashrate. When the second turns on the (Asus for example) hashrate drops and bounces from ~316 to ~326 for 6950 and ~326-367 for Asus and when I turn Gigabyte on the hashrate drops even more significantly ~296-309 6950, ~311-354 Asus, ~309-349 Gigabyte.

What the hell is going on?

I use Aoclbf 1.81 + Phoenix 1.7.0 whith modofied kernel + Cat 12.1 + Windows 7 x64 SP1
Flags are: -k phatk2 VECTORS2 BFI_INT FASTLOOP=false AGGRESSION=11 DEVICE=X

Everything was perfect untill I installed Intel OpenCL SDK. Now I have uninstalled it but the problem remains.

Today I tried CGminer 2.0.8! VGA clocks are the same!
Flags are:
cgminer -o http://pit.deepbit.net:8332 -u *** -p *** -I d,10,10 -k phatk

This gives me ~306 MH/s for 6950, ~411 and ~ 396 for Asus and Gigabyte correspondingly.

PLEASE help me to resolve a situation!
Thanx in advance