Sun's x86 servers are red hot, and I mean that in a good way. Our list of the top five scorers among the servers reviewed in 2006 includes two from Sun, both from the Opteron-based "Galaxy" series, and they're #1 and #2. HP, Dell, and IBM, watch your backs.
Sun Fire X4600 M2 Excellent [8.9]
Sun Fire X4200 Excellent [8.7]
Dell PowerEdge 2950 Very Good [8.5]
IBM System x3550 Very Good [8.4]
HP ProLiant DL380 G4 Very Good [8.2]
I've been testing the Sun Fire X4600 M2 for the past few weeks and no word of a lie, if you are thinking of virtualisation, server based computing, Citrix , 64 bit and can meet the criteria for a Try Buy go to www.sun.co.uk or www.sun.com "GO GET ONE OR TWO". It ROCKS…

I have done performance testing at Microsoft, HP, DELL and I've not got excited about piece of kit in a long-time. (Sad I know, but way cool)
Seriously I know there are a lot of die hard HP and DELL guys and girls out there, but if you feel GEEKY have a look at these, I don't think you will be disappointed..
Next test how may Citrix Servers can you run and connect too on an x64 server.. Guess's on a post card.
check out my homepage for more information on http://charlesaunger.eknowlogy.com
Charles Aunger
charles aunger eknowlogy / eviglio / frameworkx / charles.aunger homepage
I have been doing some lab work with the Sun Sunfire x4600 and ESX 3.01. One of the tests we have been running has 35 VM's of Windows Server 2003 - 32 bit using a mix of single CPU, 2 CPU and 4 CPU SMP, running endless full server backup process on each VM, (not recommended in most VM environment due to High I/O) and the server doesn’t even break 50% load… it just keeps giving really keeps giving. Moving up to 50 VM's today and I don't expect to have any major issues. I really think the issue might come for the SAN connectivity. May be you can get 70 VM servers on a HOST...