PsP Upgrade - General Advice Sought

[zeroagemain]

Hi All,
I manage a Proliant server environment and keep all firmware and drivers relatively up-to-date.

I'm about to be given some extra servers to manage which haven't been kept up to date (old firmware and PsP approx 7.90).

My question is, does anyone have any experience of issues when upgrading a PsP in such a large step (i.e. 7.90 -> 8.70).

I plan to do it across the board but wondered if anyone would recommend a stepped upgrade of some kind.

I trade points for advice!

Thanks,
zeroagemain

[zeroagemain]

I should add that I'm familiar with most of the driver upgrade related advisories, so my question is really more about people's experience of the outcome of any similar significant upgrade (large PsP step) and how well it worked.