Re: need system help!?!
I can answer the second one but not the first i'm afraid.
The heat spreader is just there to slightly cool the RAM, yet, no performance gain will be made from having them.
The only time you may get a performance gain, is if you do an overclock. Of course, the heatspreader might cool the ram enough to do more of an overclock, than if say, RAM without.
So I'd go with one with a heatspreader just incase for that purpse, but no, you won't get a performance gain unless in these circumstances.
Abit IP35 Pro / Q6600 G0 / Zalman 9700 / 8800GTS 640mb / 4x 2GB Corsair XMS / X-FI Xtreme M / 1x 1TB / Antec 900 / Logitech Z-5500 / Samsung 20inch