Performance when running concurrent 6.1 and 8.0

We are beginning to convert from 6.10.543 to 8.03 and are planning to
run parallel for a month.

I am concerned about performance while running concurrent.

If anybody has some experience with this (and similar hardware/user
configuration), I would like to hear from you.

Our server is HP Proliant 3.4ghz, 3 gig of RAM, 200 gig free hard disk
space.

We have 22 user licenses and about 7 shop floor computers connected.
Our db is about 2gig in size.

Randy Weber
IT Manager
TLC Electronics