We are on version 4.1.450.7 - If anyone dare to upgrade to the new version please lets us know the outcome 
My environment suffered massive network outage last night on the 10gb interfaces only. This has lead to knock-on problems in my environment.
I can no longer recommend updating, at least until VMware figures out what caused this latest issue... though the only thing changed was the firmware/driver patches I made on thursday/weekend.
Disconnects were a major pain, but my situation is now a million times worse! 
I noticed the other day that HP have an earlier BIOS (4.1.450.1707) posted for the NC550 SFP card dated 25 March. Haven't tried it yet though - bit concerned by the fact that its older than the 19th feb version.
In any case I have partially solved my issue through the use of a replacement QLogic card (NC522 SFP). Check out the dropped packet results (6 days of gathered stats):
The host with 0 packets is unsurprisingly the one with the QLogic installed. I plan to replace the rest of my cards since no fix is in site yet with the Emulex line.
If anyone was interested, the PowerCLI code i'm using to pull out these stats is:
$output = @()
foreach ($hostname in (Get-Cluster -Name "<cluster_name>" | Get-VMHost)) {
$esxCli = Get-EsxCli -VMHost $hostname
$output += $esxcli.network.nic.stats.get("vmnic4") | Select-Object @{n="Host";e={$hostname.Name}},*
$output += $esxcli.network.nic.stats.get("vmnic5") | Select-Object @{n="Host";e={$hostname.Name}},*
}$path = "C:\test\results.csv"
$output | Export-Csv -Path $path -NoTypeInformation
Rebooting the hosts will clear the NIC stats.
Cheers
Mark
Two of our hosts has been updated to -
NIC Firmware: 4.2.401.605
NIC driver: 4.4.231.0
Still having Dropped recieved packages 
