High memory support in 2.6.15-amd64-server kernel?

[Andreas]

Hi,

I have a HP ML350 with a Xeon 5130 2Ghz CPU and loads of disk. It came 
with 512Mb RAM so I ordered another 1,5Gb RAM.

But when I want to set High Memory Support in menuconfig, I don't have 
the choice? I mean, in "Processor type and features" there is no longer 
an option called High Memory Support. Has this been taken out or does it 
  have an dependency I've missed?

Regards
Andy