Help with memory

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Define what best means to you? Bottom-line, anything faster than DDR3-1600 CAS 9 has been proven to do nearly zip on the FX-8150.

Here are a few good choices:
4x4GB
Corsair Dominator GT CMT16GX3M4X2133C9 - http://www.newegg.com/Product/Product.aspx?Item=N82E168...
Mushkin Enhanced Blackline 994046 - http://www.newegg.com/Product/Product.aspx?Item=N82E168...

2x8GB
Mushkin Enhanced Blackline 997050 - http://www.newegg.com/Product/Product.aspx?Item=N82E168...
Corsair CMP16GX3M2A1600C10 - http://www.newegg.com/Product/Product.aspx?Item=N82E168...

More money than being useful:
G.SKILL Trident X Series - http://www.newegg.com/Product/Product.aspx?Item=N82E168...
G.SKILL Ripjaws X Series - http://www.newegg.com/Product/Product.aspx?Item=N82E168...

The 8150 has also proven to be pretty bad for gaming.

If you are going to spend $200 on a processor it should be a 2500k, not an 8150. The 8150 is worse in pretty much every way and certainly for gaming.

You would have to change your board to a 1155 at the same time. A gigabyte Z68 or so.

The G.Skill RAM is OK, but I would suggest Crucial or Kingston instead. The thing that I would suggest not doing is using 4x 4GBs. 2x 4GBs is enough for almost any computer and certainly for a gaming oriented one.

Either 1333 RAM or 1600 RAM is fine, anything over 1333 pretty much never provides any benefits for gaming since RAM speed is pretty much never anybody's bottleneck.

Thanks for reply. I will make this machine for windows server thats i use 16 gb of RAM. What does it means Memory Timing? such as this 10-12-12-31 . The more timing a memory have is better?

It just isn't really possible for the average person to make sense of memory timing statistics and not really that necessary. Those numbers can change based on a lot of factors.

If you absolutely must consider them, you need to isolate a RAM speed (say, 1600 mhz) and not compare any other RAM speed at the same time, only RAM of that speed. If you try to compare in this way, the lower the better.

If you try to compare, say, a set of 1333 and 1600, it is tricky because a CAS/CL 8 on 1333 may perform the same as CAS/CL 9 on 1600. The lower isn't always the better in this case. CL 12 might be faster than CL 10 if the CL 12 is on 2400 MHZ ram but it might be worse than CL 10 if the CL 10 were on 1600 and the CL 12 were on 1866.

It will make your head hurt, trust me.

If I were you, I would pretty much completely ignore that aspect.

If you get a good set of RAM from Crucial or Kingston it will probably be good enough for what you are doing.

What exactly is this server supposed to be doing that it needs 16 GBs of RAM and where the timing matters?

Ok now i unsterstand how is works   . I will make a java server of lineage 2 (Private) and i want this machine i will build not stuck when a 2000 people get inside of my server. I will keep this G.skill of 1866 because my motherboard support 1866 Mhz without overclocking . Thanks by the Way!!!

If you have problems with it after it is setup, let me know.

Unless this is for a Virtual Machine or 'database hosting' or something more than the run of the mill 'Windows Home Server' then you do not need 16GB of RAM for data R/W (NAS) backup. 'Windows Home Server' 4GB maybe 8GB (overkill), it's all about the 'drives' (storage), sharing and backup -- not to mention there's no need for a 'GPU' much less a GTX 570 nor a UD7 MOBO??!

So I am totally confused here?!

The CAS Timings are relative to the Frequency, note the ideal CAS per Frequency in this Chart (I need to update through DDR3-2600+):