Ms-7360 P35 Neo wo't boot with full 8GB DDR2

Question

Let's begin with me stating my problem:
I recently bought these ddr2 modules: http://www.ocztechnology.com/products/memory/ocz_ddr2_pc2_6400_vista_performance_gold_4gb_dual_channel (2x2GB OCZ Gold PC2-6400)
I already had 2x2gb Patriot ddr2 (http://www.patriotmemory.com/products/detailp.jsp?prodline=5&catid=2&prodgroupid=38&id=658&type=1) installed on my mainboard (ms-7360 P35 Neo).
Now i can't boot Windows 7 64-bit with the full 8GB memory, it gives a blue screen or just keeps looping the boot sequence. If i use 6 GB my rig works, but is still a bit unstable.
I have tried placing the new memory modules in another rig and they work. I also tried swapping the modules:
A1 + B1: Patriot memory
A2 + B2: OCZ memory         ---> doesn't work, turn out in a blue screen
A1 + B1: OCZ memory
A2 + B2: Patriot memory  --> this doesn't work, because i it has something to do with BIOS remembering previous setup.
A1 + B1: Patriot Memory
A2: OCZ memory module 1 --> works, but when i was loading files to a separate hdd i got the blue screen.
A1 + B1: Patriot Memory
A2: OCZ memory module 2 --> works too, but like above it's only 6GB and i want the full 8GB.
A1 + B1: Patriot Memory
B2: OCZ memory module 1 --> works
A1 + B1:Patriot Memory
B2: OCZ memory module 2 --> works
Oh, i almost forgot to say this: During the boot i also see that, when all 4 slots are full, i see 8GB
Now if anyone can help me get the full 8GB working, I'd be a very happy person

Answer 1

 Get all 4 matching modules. It works when you have 3 of them installed because they would be in single channel mode and single channel can tolerate miss-matched RAM much better than dual channel can. 2.2V Patriot 4-4-4-12, 1.8V OCZ    CL 5-5-5-18