i have t3400 that still works ,

it just is not to slow ,   means i need to look at motherboard/cpu upgrade on this machine

what are my good options . 

I love the chasis so it is hard to for me to let go of my memories on this machine ...

please advise ... suggestions ..... i have some time .......

or i  will be looking at a new ISV certivied machine to get ...   Cost is important ...