PMDG MD-11 vs 737?

I already have the PMDG 737 and it by far seems to be, for me, the most bug ridden plane I've got.  The frame rates don't so much take a hit (steady around low 20's on the ground of KSFO or Heathrow) as much as the textures "skeletonize" frequently.  Sometimes when coming out of a flight, the rotating plane screen will be blank, sometimes in a flight the textures will just disappear and on one occasion, my computer froze.

I'm not by any means trying to smear their work, in fact I've been tempted many times by their MD-11.  My question is, how will it compare, system resources wise?  Is there a good chance I'll likely have the same issues with that product as well?

I have the Majestic Dash 8 and it is by far the best plane I have.  Smooth frames, no odd issues but to be fair, it did freeze once over the Atlantic while coming back from St Maarten.  Otherwise, flawless.  FPS are at round 30+ in the same situations.

I have of all things an Alienware M14x with an i7 quad core at around 2.4 g, 6 gigs of ram and GT650m (?) about 1.5 g.  You'll forgive me if I'm not terribly familiar with the proper terms.

I tried *******'s tweak and while it did actually help by the flights seeming to fair better in regards to no weird textures, loading flights and coming out of them often crashed the whole program half the time.