Am new to tech. So keep your answere's as detail as possible.
About a month ago i bought a new desktop pc which have intel dual core e5400 processor in it. I knew that it is 2.7 GHz. But recently when i wanted to oc it in bios it shows its 1.7 GHz(8.5x200). I was surprised. I bought the 2.7 one. My dxdiag report shows " Intel Dual core e5400 @ 2.7 GHz ~ 1.7 GHz". What does it mean by 1.7 at last ? My motherboard is gigabyte G41-ES2L. I overclocked it a little in bios 1.9 GHz. Then the dxdiag report says 1.9 instead of 1.7. Is my processor 1.7 GHz ? I bought a 2.7 one. I checked the intel's website and the specification of e5400 says its 2.7 GHz. So whats the problem in my system that it shows 1.7 GHz in bios ? Guys please help me. Thanks in advance.
The ''speed'' (amount of ghz) of your cpu depends on both the front side bus ''fsb'' and the multiplier. so atm you have 8,5x200 wich results in the 1.7 ghz you posted. However the stock multi of this cpu is 13.5 wich would result in 13.5x200= 2700 mhz = 2.7 ghz.
In short, either the multiplier went to its lowest point because you set it that way by accident , or the motherboard does that because you fiddled with something els.
Solution rather simple, simply manual set it to 13.5, where to find this is generally under the obvious tabs like ''cpu''. Althought this differs per motherboard.
Also note there is an option in your bios that lets your cpu downclock depending on the cpu usage, this obviously only shows in windows. What this does is lowers the multiplier to run at a slower pace and conserve energie.
Its recommended to disable this setting when overclocking since it may give instabillty issues.
The settings you are looking for are: Speedstep, and C1E. Just have these two on disable. In windows use programs such as ''cpuz'' to check your current cpu speed and much more.
it's not a problem according to me.. Its due to the Intel Speed Step that's been enabled in the BIOS. It automatically underclocks the Processor frequency when there is no load. Basically a power saving feature.