I was advise by my webhosting company providing managed colocation dedicated server service that adding 128Gb RAM to a Sunfire X2200M2 Server (Dual Quad Core 1.9Ghz) to run ESX 4.0 Host would not be advisable.
The Sunfire server support a maximum 128GB RAM, but they say its no point adding that much RAM as the Dual Quad Core CPU 1.9Ghz won’t be able to cope with so much RAM in a virtualise environment and they recommend 24GB as the maximum. Anything higher, will experience performance degration. Does it make any sense to you?
The maximum supported RAM for ESX4.0 is 1TB as stated in the configuration maximum doc: http://www.vmware.com/pdf/vsphere4/r40/vsp_40_config_max.pdf
The following shows that 128GB host has been deployed on HP hardware, so why not Sunfire?? http://www.eliaskhnaser.com/Article.aspx?blog=2&id=33
Any ESX guru out there like to share their thoughts? Thank you.