Oddly enough, I just upgraded from the Chaintech 7NJS Ultra to the Biostar NF325-A7 (talk about a coincidence- 2 very obscure boards!). I just got it all set up the other day and haven't had that much time to mess with it.
One thing I did notice is that the BIOS I'm running doesn't have much in the way of OC options. It has a setting for memory where you can choose 200, 166, 133, or 100mhz, but nothing higher. As for CPU OC it has settings for like 2%, 4%, and 6% overclock (or something like that) but no way to choose your HTT frequency that I saw. Granted I didn't have that much time to mess with it. I'm hoping that a newer BIOS will be better; there is one released this month and one from last month.
Biostar has a program called "warpspeeder" that is supposed to be a windows based OC utility. According to their site, this mobo supports it. But when I loaded it this morning it wouldn't let me change anything, just view my speed and voltages (which I guess is good cuz this mobo also isn't supported by MBM5!)
I'm starting to regret my purchase of this board, although it was very cheap and I got it brand new (any other NF3 board for that price would have been refurb). I'll PM you or reply when/if I figure anything else out. As it stands it is a decent board, seems to run very fast with my A64 3200+ as compared to the Chaintech with a mobile XP @2.2ghz.
PS Are you running stock speed by choice on the Chaintech, or did it not OC well for you?