IT Pro have a review of an IBM System x3650 M2 server.
A quote from the article:
>> IBM System x3650 M2 Review
IBM's latest 2U rack server has versatility as its middle name as along with support for Intel's Series 5500 Xeons, the x3650 M2 aims to offer a fine selection of storage options, greatly improved management facilities and a keen focus on virtualisation. In this particular marketplace the mighty ProLiant DL380 G6 is king of the hill and in this review we see whether IBM can take HP down.
>> IBM System x3650 M2 Review