I think it would depend on the Speed of Each stick. Not positive though.
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I think that would also depend on your mobo, my previous one didn't support dual channel so it wouldn't matter much altough they should have the same latency/timings for optimal performance.
The one i have now does support it so i got 2 1Gb Corsair XMS sticks... runs smooth.
Since i built my first decent computer i dont think i ever had a computer that didnt run dual channel ram. Thats why i was wondering.
As for the problem. I really dont know if the ram is the problem without knowing the specs on the entire computer. A computer only runs as fast as the slowest part on it. I could have a killer computer with even a crappy PS or Graphics card and for gaming ti would suck.
What do you have for a processor, Graphics card - & interface, Power supply, mobo series, HD - including the interface.