This message was posted on behalf of Intel Corporation
I'm not sure exactly what you have read but there was no specific disclosure on not supporting ECC memory. I have come to a different conclusion based on my research and I will leave this here for future reference. On the S5000PAL board all registers for FB-DIMMs and all RAM associated registers are handled by the embedded Intel S5000P Memory Controller Hub. This abstracts the Memory handling from the CPU thus giving all memory support to the MCH. Based on this information I would conclude that any CPU installed on this machine does not need a designation on what memory it supports. It all comes down to the MCH and what type of memory it supports and based off of intel's specifications the Intel S5000P does support ECC memory. I have attached a screen shot of Intel's specs on this product. My thinking and theory could be flawed. Please do not take any conclusions for fact. Thank you intel for taking the time to respond to my question.
PS. With current processor architecture they have integrated the MCH into the CPU.