Check here. Note that you need around 1cm clearance from the upper
edge of the motherboard, to the metal casing of the power supply.
So, whether it will work, really depends on what kind of computer
case you are using. Some computer cases allow as little as 1mm of
room from the upper edge of the motherboard, to the metal casing
of the power supply, and a computer case like that will not allow
you to use the Zalman. The motherboard is not the limiting item
in this case, it is the spacing of the components inside your
computer case.
OK.
http://www.zalman.co.kr/product/cooler/7000(AB)_478MBlist_eng.htm
That web page lists motherboards that are _not_ compatible, so since
the P4P800-E Deluxe is not listed, it is safe to use.