I upgrade my IP35 Pro to 4x2GB of memory. And I'm struggling big time here.

I'm trying to use 4 sticks of Patriot Viper DDR2-1000. But I had only been running my original 2 sticks at 900MHz, since that was all I needed with my 8.5x450 Q9550 overclock.

Now with with 4 sticks it seems the most I can accomplish is 848MHz.

I tried increasing the RAM voltage to 2.3.
I tried increase the MCH to 1.56, with 1.09 ICH and 1.60 ICHIO.
I tried losening the timings to 5-6-6-18.
Tried setting the tRFC up to 56.
Looked at the other memory timings from MEMSET and applied those in the BIOS too.

Lowered my FSB and increased the memory multiplier to 1.25 while I was doing these tests and used MemTest.

Is there anything else I can try to get my 4 sticks of 1000MHz memory to at least work at 900MHz with this board?