POS-PIG43BC: Need help to identify/mod this motherboard

[effelle]

A customer of mine gave me an old 775 PC, still working fine, and since I would like to make it a game machine for Half-life/halo FPS I've upgrade this machine with spare parts, an E8400, 8GB Ram and a 500GB HD and an old-but-still-good GTX 650Ti OC. Now I would like to push the CPU a little more.
The maker of the motherboard is the Positivo, a Brazilian brand that -normally- just rebrand motherboard fro MSI and Gygabyte. But in this case I didn't find any similar or equivalent motherboard design to this PIG43BC. Is a simple board, with a custom AMI bios with very few option on it, as normal for a wholesale computer. 
The AMI Bios string didn't help to identify the motherboard too:  64-0108-009999-00101111-051110-Eaglelake-1ADXP064-Y2KC. The manufacturer code 9999 isn't on AMI DB. I fear this board is produced internally. Here is how looks like:


I dumped the Bios and had a look with AMIBCP, but I didn't find any hidden option on CPU tab, and the filed showing CPU ratio a FSB (grayed out on bios) have just the options "refresh" and "not refresh", no "user" option. 

However, there is an option for "ratio CMOS setting" set to supervisor but I don't know if it's safe to change it, and there is not a supervisor login on my bios then the option doesn't shows.

I would like to know if there is the possibility to add an option to overclock the FSB, since theoretically G43 motherboards supports FSB@1600. 
Do you think I can do any kind of mod here?

Thanks.

Federico

[effelle]

Even flashing the bios with the "ratio CMOS setting" set to user doesn't let it shows. But I didn't set the fields "failsafe" and "optimal" to "00" (now on "FF") like other user editable fields. Because I don't know exactly what it means...
I added the original bios dump in case someone would gently have a look on it.

Note: I bought a Xeon X5450 already modded to test with. But I can't have it for the next 2-3 weeks.
Thanks,

Federico