Take back my pc4000. I bought it at best buy out of impulse becuase it was onsale but since I am running an AMD system I can't really use the extra Mhz but I could use better timings. Would I be better off to take it back and get some LL ram or is it not the big of deal? Also would best buy even take it back? Its opened but it and the boxes and paper work are in mint condiction