Yes and also to look what kind of connectors goes to motherboard. I'm not sure about packard bell, but I think they might done something similar to IBM at some time at least so better be sure before getting anything.
Anyhow, I still fail to see that upgrade would be 1st option here as you should be getting around double of fps minimum what your getting now at max. Really here is something wrong in this pic and what is point of investing lot of money if you still are getting as bad or nearly as bad fps after upgrade, if it is software issue after all?
Of course, must say that with other games that gfx card sure is rather slow, but with LFS it should give good performance, imo.
If you are getting new PSU make sure it has more than one +12V line and something near 30A to +12V line is what you are looking for if you like to look into future upgrades as well.
This is PSU I have, but you need more powerful model if you like to get it future upgrade ready if you like to have some reserve in it.
Nexus 120mm fans would be nice, but you need to open case and look inside if there is any places for fans first.