Any recommendations for what type of 10 gigabit cards with red hat 5 EL pci-e slot?
 

Looking for a 10 gigabit card that work with RHEL5.2, I've tried a couple different cards, none of which come close to 10 gigabit. In some cases the 1 gigabit cards transfer at higher rate.

Transfers tests are from a ramdisk -> crossover cable -> /dev/null/ ; local loop back transfer test results in about 7 gigabit...

Hosta to Hostb is around 1.5 gigabit (using mtu=8000), on a DL585G2, cpus are only spiking up 2-3% on a transfer.