wanna help about OC the frequency of my 920xm?

Hey guys, can anyone help me to OC my 920xm without using the software-Setfsb? ( I wanna kill Dell for not giving M15x the option of 5% OC)
Thanks so much~

 

Have you tried ThrottleStop? You can adjust the TDP/TDC as well as the multiplier.

 

Yeah ThrottleStop seems to be about the best way to OC the chips.

I'm getting 3.2gHz out of my 920XM pretty easily (though typically i run it much lower because nothing much requires the 3+ gHz speed)

 

yeal,I tried,but seems, Throttlestop can't adjust the frequency of 133MHz, it can only set the multipier...

 

seems Throttlestop isn't able to adjust the frequency 133Mhz.

It can only OC the multiplier.

 

What system do you have? If setFSB doesn't work for you, you're out of luck... that's the only possibility to change the BCLK atm.

If you overclock the multi you will gain MUCH more than whith adjusting the BCLK.
Let me explain this briefly... changing the BCLK will result in an overall speed gain, indepentend of the multi, but you won't really notice it as the turbo ratios are still unchanged (and turbo boost may even be negatively affected by changing the bclk) With Throttlestop you can get to speeds like 3.2GHz + on all 4 cores... not just on one with the standard turbo boost levels.

Throttlestop can do much more than only adjust the multi. You gain control over the TDP/TDC values as well as the turbo ratios... and it has a lot of other very useful functions.

I'd say you first read the Throttlestop guide thoroughly, there you'll find an excellent description on how it works.

You will see it gives you much more speed than you can ever get with setFSB... and btw, setFSB works not very well on a 920xm, at least that's my experience. I can't get it to run stable at more than about 143MHz.


Feel free to ask questions if something is unclear.

 

Yep, increasing the BCLK from 133 isn't going to gain you much in the way of performance. In fact, you don't want to do this at all if another option is available (multiplier).

 

Increasing the multiplier is a much better way of overclocking. For example currently your 920XM is 133x17=2GHz but is you change all the multi's to say 24, you get 24x133=3.2GHz. Overclocking the fsb will only provide you something like 17x150=2.55GHz.
I ask, why do you specifically want to OC the frequency?

 

Thanks so much for answering my question...Your explanation can't be more clear and understandable!

The reason I like to OC the bus speed is knowing M17x has a BIOS option to gain a 5% OC of bus speed while M15x hasn't.
I know DELL wants to set a different strategy of their products( M17x & M15x). but still feel a little bit unsatisfied.

Actually, before I read your reply, I've found the guide of Throttlestop, I realize it's such a powerful tool to gain the maximum CPU performance.
PS: I've been using Throttlestop all the time but until now I don't fully realize how much powerful and functional it is!

I've set my TDP/TDC @ 90 and 25/24/24/24. Though the temp is a little bit high, it's still under control with a Icd7 thermal paste.

BTW,I've contacted abo- the owner of Setfsb, and as u said, it seems that my 920xm is unfortunately at the list of "unsupported clock generator". Though a little disappointed, It's much more pleased to know the fantastic function of Throttlestop.

Thanks again!

 

Maybe you want to check out this thread?
http://forum.notebookreview.com/alienware-m15x/520311-multiplier-manipulation-xm-processors.html

It has many posts but give it some time,you will understand more clearly about 920XM overclocking,not to mention the danger levels when setting the multipliers.I just successfully overclocked all 4 cores after going through the posts.

 

adjusting the multiplier is the best way to overclock.
changing the fsb also adds stress on other components including the ram, hdd and pci slots (including the pci-e slot). Increasing the multiplier puts all the stress on the cpu, much easier to isolate issues and not over-stressing hardware unnecessarily.

considering we have no way to ensure the other components fsb's are "locked you'd want to avoid this even more.

also, unlocked multiplier and tdp/tdc is why you paid a premium for the "extreme" series.... having such a cpu and overclocking via fsb instead of multi is a waste of potential (and $).


finally, one last point.
overclocking with throttlestop with the correct settings means your system is overclocked... but can still underclock if your system overheats (provided you do not lock the cmod and chipmod). most programs which increase the fsb will hold it there till your laptop's on fire.