on a related note, i have been trying to fix the L2 scaling: R7800 cache scaling issue. would be much appreciated if others could test it too.
i have not accounted for this hardware constraint in my patch, but it seems to be working even with the minimum frequency at 384. i can try pinning one core to 384 and one to 1725 later and see what happens 
. i must admit i haven't had to deal with traffic bursting to 4Gbps, so haven't seen the router locking up.