same problem here.
windows 7
2x 5770's
4 gigs allocated
crash upon loading advanced machines.
"Graphics driver has stopped responding and has recovered." etc. etc.
This really detracts from the tekkit experience, and has blue screened my comp twice..
not to mention, someone could lose all their work on a server to someone who wont pick up a machine for a sec.
Could someone qualified please look into this?