Is this your board's Bclk limit or do you think you can get a few more mhz? http://hwbot.org/community/submission/989195_dejan_bin_laden_reference_clock_rampage_ii_gene_228_mhz
I think it was something to do with disabling cores is disabling features on a CPU but getting a triple core for example to work as a quad is using more than its actually sold to do.