antony_tem said:

Thanks

Would lowering the Cpu Multiplier to 15 affect its perfomance ?

When you raise the Base Clock (bclk), understand that that overclocks the entire processor and memory systems.

I believe your stock CPU multi is 20, and the standard bclk setting is 133. 133 x 20 = 2,660. And there is your 2.6Ghz

For Memory it's the same math: The memory divider may be set with 6, 8, or 10. At the stock 133 mhz Base Clock, that nets 798, 1064, and 1333. Your system does not support dividers higher than 10. So the only thing left to change is the Base Clock. But this takes everything else with it.

So - If you raise the Base Clock, then what happens? Let's try 150, so we get nice, neat numbers:

150 bclk x 20 cpu multi = 3,000 for a 3 GHz Processor overclock

150 bclk x 10 memory multi = 1500, for DDR3 1500

Using the 186 number Bilbat gave:

186 x 20 = 3720 for 3.7Ghz

(this is a high overlock, by the way: 3.7/2.6 = 42% You may not be able to count on this being stable or sustainable. And certainly not without raising voltages and heat.)
186 x 10 = 1860, for your memorys rated speed.

This is not likely to be stable without superior components, a lot of knowledgeable tweaking, and a superior cooling system. Let me say that again: a 42% overclock is not likely to be stable unless you have superior components, a superior cooling system, and some knowledgeable tweaking.

Therefore, as Bilbat said, you will likely have to LOWER your processor multiplier in order to reach something reliable.

So, let's look at the math again:

At a 186 Base Clock

(maybe your motherboard can sustain this... maybe not), we know that your memory will run at 1860 Mhz.

186 x 10 = 1,860, or 1.8 Ghz = Way slower than stock, right?

186 x 15 = 2,790, or 2.7Ghz. = a little faster than stock, but a very mild (2.7/2.6 = 4%) overclock

186 x 17 = 3,162 or 3.1Ghz = A respectable overclock (3.1/2.6 = 19%)

The issue here is you overbought memory for the system you have. By this, I mean your RAM is fast enough that you have to strongly overclock everything else to get to your memory's rated speed.

My personal recommendation is (1) Accept that you overbought and don't worry about it. But if you must, then forget about getting to your memory's "rated" speeds. Rather, split the difference with a comfortable CPU overclock and be secure in the knowledge that any issues are likely not the fault of your RAM.