it's likely a problem with your board and not the chip. the 1700+ has a default multi of 11x. with most via boards, you'll be forced to use either multis below 12.5 or multis above 12.5, depending on the default multi of the chip. in your case, it's 11x. so nothing above 12.5 is going to work unless you do a
workaround to pick a specific multi. theres other workarounds that would enable you to choose multis higher than 12.5 only.
i did the socket mod and forced my via kt333 board to a 13.5x multi with my 1700+. 14 and 15 worked, but was unstable.
an nforce2 board would work much better. but the socket mod is also pretty easy so you might wanna try it. and it doesnt permanently change the chip or board, so its completely, and easily reversable.