I7 tripple chanel problem

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I make a new pc with : -win7 pro 64bit
- PSU coolermaster 850w silent pro m850
- CPU intel core i7 960
- CPU cooler coolermaster V10
- M/B ASUS P6T7 WS SC
- RAM DDR3 OCZ 6gb KIT ocz3p1600lv6gk (3x2gb)
I change my ram cause this problem with an ddr3 corsair 3x2gb kit tr3x6g1600c8
- 2x VGA pci-x gigabyte GV-r577so-1gd 1gb

And i got this problem my PC shows only 4gb instead of 6gb. After a cold boot my pc shows 6gb after an other my pc shows again 4gb ram and this continius. I change my ram to the one listed before and i got the same problem. I take it where i buy it and they said that nothing wrong after a memtest and some other test. So i hear that i7 got problem with tripple chanel and if u make it 4x2gb the problem will be fixed. What should i do? Sorry for my english.