Best 10GBe Card for iSCSI ?

[mr.migu]

All,

your oppinion on iSCSI and 10GBe Cards please:

a) Chelsio Communications: N320E-CXA T320 based with software iscsi (CO on HCL!)
b) Chelsio Communications: S320E-CXA S320 based with hardware iscsi (no HCL entry?)

c) NetXen (QLogic): NXB-10GCX4 with hardware iscsi (CO on HCL!)

Or should i stay on current Intel X510 Cards (Intel Corporation 82598EB 10-Gigabit AT CX4 Network Connection (rev 01)) ??

Usage is 80% iSCSI for VMWare ESXi 4.1 and Windows 2008 R2 with Exchange 2010.
Today we us an older DELL 2970 / two 10GBe Ports in Bonding Mode (balance-rr).

The DELL 2970 will be replaced with DELL R715 beginning 2012 ...

Any experiences with card a), b) or c) ??

Thanks

[adamvh]

We use the Intel X520's with direct attached copper cables.

http://www.intel.com/content/www/us/...rnet-x520.html