405EP PCI performance

Hi,
I've noticed that any PCI Ethernet card in 405EP Evaluation board has limited tx rate to 66Mbit/s. If there are more cards - I still have 66Mbit/s for all cards.
Rx rate is OK - 100Mbit.
This doesn't look like CPU problem because the same CPU easily transmit 100Mbit via OCP Ethernet.

Any ideas which could cause such problem?

thanks in advance,

Andriy Korud.

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