Masrawy1973 :
another question if i get cl9 ram and i want tighter timings can i just change the timings without risk of system instability or is it not that simple?
thanks for any input in advance!
Changing any component from the stock settings can always lead to system instability. When you buy a product like ram from a manufacturer they are guaranteeing that it will work at the specs listed. The manufacturer knows they work because they have been tested at these specs. Some of the ram modules will be able to OC very well, while some modules may not be able to OC at all. But all of the modules are guaranteed to work at the listed specs. Its pretty much a crap shoot as to whether you will get a good batch or a bad one.
About OC your ram ... there are 2 different kinds of OC you can do with ram. The first is tighten your timings like you are suggesting, which will reduce the delays in many of the internal timings of the ram (9-9-9-24 --> 8-8-8-21). This will in turn make your ram more responsive. The second is to increase the ram speed (1333MHz --> 1600MHz). This will cause your ram to work faster and may need a bit of a voltage increase as well. For either OC you will probably need some kind of synthetic benchmark to see the performance difference from stock settings.
Yes, both of these OC tweaks can lead to system instability. Simply lowering the timings or raising the clock speed will not damage your ram modules permanently. However raising the voltage to achieve stability can cause damage to your ram or even your mobo. That would be why it is good to know that your mobo limit is 1.5V you should not raise the voltage above that.
My recommendation would be to install the ram and immediately go to you bios and set the timings and voltage of your ram to its stock ratings. After that run Memtest for a while to make sure you have good ram. Then if you want you can play with the timings or clock speed. But in your case I would set the voltage a 1.5V and leave it alone.
Good Luck and Have Fun!