Hi guys, I have very limited knowledge of exactly how timings work but the main understanding i have is that people try to achieve the "tightest" timings (lowest) @ the highest frequency possible. Would a 667Mhz kit @ 4-4-4-12, be better than 800MHz 5-5-5-15? When adjusting timings what does the last number represent and why is it higher than the others? 4+4+4 = 12 5+5+5 = 15 ^ does this mean anything or is it a coincidence. i've been reading this articles but it seems a little oblivious to me and their conclusions haven't really summed up what "optimal timings" are.. which is what i'm trying to work out. Can anybody help me out here? Update I have added some basic testing and here are my results as follows: Test Setup Intel Core 2 Quad Q6600 @ 2.40GHz 2x1GB PC6400 ADATA DDR2-800MHz 1.83v 5-5-5-18 Seagate 320GB SATAII 7200RPM 16mb cache Albatron Geforce 8800GTX 768mb EVGA 650i Ultra A1 ASUS SATA DVDRW 18x Windows Vista Home premium 32bit I chose to compare the sticks at their stocks speeds and then @ 4-4-4-10 2.0v 667MHz CPU-Z defaults CPU-Z overclocked Testing For testing i have used Passmark Performance test 6.1 [Basic and advanced memory testing read/write] Passmark Defaults Click for full-sized image Passmark Overclocked Click for full-sized image! Seems Write speed is slightly down, what would be the cause of this? 3DMark 2006 1.1.0 Direct comparison Gaming Counter-Strike: Source [Video Stress Test - Maximum graphics settings] settings results Conclusion Well there you have it, results pretty much speak for them self although I have lost 133MHz on my RAM the tighter timings have given me a very slight gain in performance, both benchmarking and gaming I would have liked to have included results for the time demo featured in F.E.A.R but i have yet to install the game and will need the massive patch for solid results. Some of you may ask, why didn't u set it to 800MHz @ 4-4-4-10? well even at 2.10v (max on my board) this memory won't budge, it wont even overclock by 1MHz on its stock timings. Very interesting learning experience there hope someone else finds it useful. edit: just noticed i did the read test twice for the OC'd values.. i'll update that now.