VMware has released a new Broadcom bnx2x Nic Driver for ESX(i) 4.1 which is used in HP blades for the HP NC532 Nics. http://downloads.vmware.com/d/details/dt_esxi40_broadcom_bcm_netxtreme/ZHcqYnQlZXBiZGgqag
The new version is 1.64.32.v41.1
I’ve had confirmation from Rotem Agmon, a VMware Technical Consultant at HP that this new driver is not supported by HP.
The currently supported Update Manager driver friendly versions are: ESX(i) 4.0 - 1.62.11.v40.1 http://downloads.vmware.com/d/details/dt_esxi40_broadcom_bcm57xxx/ZHcqYnR0d3BiZGVqdA==
ESX(i) 4.1 - 1.62.15.v41.2 http://downloads.vmware.com/d/details/dt_esx41_broadcom_netxtremeii_032311/ZHcqYnR0anBiZGhwZA==
My Flex-10 ESX(i) pre-requisites post has all the driver and firmware required versions.