P43-C51: How to optimize FSB/RAM bus clock ratio

Hi there, is there any way I would be able achieve maximum supported bus throughput of my RAM (DDR3-1600, Bus Clock 800MHz).
Currently I am only able to reach a RAM bus clock of 532MHz with my Dual-Core E6300 2.8GHz at 266MHz FSB using the BIOSs 1:2 FSB/DRAM ratio. I tried using the motherboards on-board OC switch to increase FBS from 266 to 333MHz, but the system won't even boot. With manual FSB adjustment I managed to increase to a stable 300MHz, though this didn't increase the RAM bus clock by much (only to 600MHz, still 200 off of my target).
If the BIOS would support a 1:3 ratio I would not even have to OC as this would give me a desired 266:800 FSB:DRAM ratio. The BIOS gives only a max ratio of 1:2, and as I'm not quite sure how the motherboard or CPU inter-handle the clock values I guess this max ratio is probably there for a reason.
I also speculated that If I could decrease the CPUs Bus/Core ratio from 10.5 to 7 giving me a FSB of 400MHz instead of 266MHz, and if I were to use the FSB:DRAM 1:2 ratio I could get my target RAM bus speed. Unfortunately I have not found a way to modify this on the BIOS.
Many thanks for any suggestions.

Quote from: Jack on 09-September-11, 20:44:50
The 1:2 Ratio is the maximum ratio supported by the chipset.  This is a hardware limitation, not a BIOS issue.
Thanks for the clarification.
Quote from: Jack on 09-September-11, 20:44:50
Not even after a CMOS-Clear?
I did clear CMOS severel times after manually adjusting FSB when I was unable to enter back into BIOS, but I'm not sure If I tried the on-board OC straight after a CMOS clear. Or did you mean clearing CMOS after setting the on-board OC?
Will try both when I get back home. Thanks for the tip.

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