Hello mate I'm in the same boat but my memory craps out at 950mhz so i cant get passed 2,2ghz run it at 2.0 though as i really don't trust the memory so I'm looking into getting a E6300 at least to try and combat crap memory, shame really cause i know this chip could do a lot better.
damn gigabyte when i emailed them regarding the issue said it was a hardware issue with the chipset wouldnt allow the ratio's shame they didn't have an answer when i stated Asus and MSI'S offerings with the g33/p35 express chipsets gave the options without a problem.
i then moved onto accusing them of deliberately holding the bored back to keep it in the budget range and told them they would sell a lot lot more if the stupid 1:1 divider was there.
needless to say i have not heard back from there support team.