i'm not shure about it but on intel website, they say it's only compatible with pentium 4, on the 2 versions of the chipset.... only from 945 and up are compatible with the pentium D
you 2 can't say whether it will work or not.... the OP didn't say what specific board he has. "intel 915" could be an intel branded i915 based board.... or it could be an i915 based board from another manufacturer.... lolitha please tell us the specific brand and model motherboard you are refering to.