retro fitting E5-2470V2 to a Proliant DL360e

Hi,

I've tried fitting two E5-2470V2 to a Proliant DL360e that came with two E5-2450Ls fitted. With the new processors the server fails to reach the POST screen, its OK with the original CPUs back.

As the 2470V2 were an original CPU option for this model, Is there a firmware update I can apply or something else I could try to use these faster CPU's?

Thanks in advance,

Robert.