as for me i vote tight timing becoz to achive high mhz with tccd (e.g 315mhz) u need to lower some option in bios in order to achive that..

but i have tried same dual channel bh5:

1. mushkin lvl 2
2. twinmoss sp bh5 utt

both at same speed 255mhz.. the mushkin give a little higher score that twinmoss. the chip also influnce the score in sandra...

by the way.. i like number 2 rather 4...hehe