well your ram is overclock quite a bit, cheap ram tends not to oc very well, your is running at 180mhz (360mhz effective), which may be the cause of the problem. Your only other option would be to run it with a 3:2 divider which will bring the ram clock down to 144 and give you some room to push the cpu further. However any gain may be negated by runnning the cpu and clock further out of sync.
Bad news about your motherboard, there are no option to jack up the vcore available.
Whats more I noted that there dont seem to be any options for PCI/AGP locks which could be a serious issue if this is the case, with risk of hard drive corruption. Does anyone out there no if this board offers pci/apg locks.