Oracle insists that Intel is planning to drop its Itanium chip platform and has accused HP of not being completely transparent with customers when it asserts the opposite.
"HP is well aware that Intel's future direction is focused on x86 and that plans to replace Itanium with x86 are already in place," Oracle said in a statement late on Wednesday. "HP is knowingly withholding this information from our joint Itanium customers."
Oracle also rebutted HP's assertion that Oracle's abandonment of the platform would put organisations at risk by costing them "millions of dollars in lost productivity".
Oracle, whose Sparc processors compete with Itanium, x86-64 and IBM Power7, denied this, pointing out that it would continue to offer support to existing Oracle customers using Itanium hardware.