Memory upgrade on SBC AP4500 model

Hello all,

we're running couple of Centrex AP4500 on SW 7.4  with huge configuration (sh run is 15 MB clear text) and about 1500 sessions in peek time.

SW 7.4 uses a lot more memory then 6.x. We're constantly 80-85% (4GB) and sometimes we have reboot if NNC tries to restore configuration (probably it fails due to lack of memory).

This box has new Enterprises (new access realm) provisioned every couple of days.

As we understand 4500 parts are EoSale. Did anyone try to upgrade memory by themselves or bought CPU+memory module (it's bundeled) from thirdparty company?

We'll migrate traffic from this box in near future but we must keep it working till migration.