Okay, I'll suggest some things...hard to troubleshoot from this far away:
1) SANDRA 2006 Lite - great little burn-in/diagnostic program it. Hunt it down, install it, and leave it running overnight on it's "make my system cry" type of settings. Given the issues your having, I'm honestly wondering about 3 possible things:
a- some bad ram
b- bad video ram - not likely
c- faulty network card (or likely ethernet port on the motherboard) - this is what's twigging as most likely to me, as it's similar to an issue I had a while ago. I threw in a new $20 network card, and fashoom, problems went away.
Could you or Katak post the exact specs (ie motherboard, proc, vid card, etc - brands if you've got them, models, etc.). I'll hunt around and see what issues I can find.
Also - who'd you buy it from, do you have warranty, etc. Might be worth calling whomever it is for tech support - if both systems are the same, mention that one of the two systems isn't having the issues.
Given that you've got more RAM, maybe one of your sticks of ram is faulty, and causing the issues you're having.
Hope this helps!
