According to CPU World on the S1 Socket Motherboards. Here is the list of all Processors that will fit in that socket:


But I highly advice that you open a HP Support ticket to find out which of the above listed processors are supported on the particular motherboard and which BIOS version you need installed to support the processor.
All of the above processors will fit in your motherboard S1 socket. But if BIOS doesn't support the processor you PC will never boot up.