mine does 1.419 at default volts, but not higher at up to 1.8V.
Don't know what's stopping me Crucial PC133 CAS2, IBM 60GXP, Tekram 390F, MX300, Promise Ultra 100, Radeon 8500....
definitely the 1.4-1.5 range is a sort of given with this chip....unless one is very unlucky.