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Holy Moly this is 20 years old!!! I'm here in this epic thread, going to come back in 20 years :cool:

Have you tried different servers? I'm perfectly fine on Washington DC but as soon as I swap to anything else - everything starts to lag. Also, are you on predictive or lockstep?
Edit: haven't...

I'd definitely advise against using a mismatched RAM. Save yourself from a headache down the road and buy exact same RAM sticks.