np8690 and extreme cpus

Has anyone successfully overclocked a 920XM or 940XM in the w860cu?

I planned to buy an extreme processor in the future but since I have tested my current cpu with cpu : linpack and already have reached 78C and 27.4W
I have an i7 620M, some ic diamond 7, only a theoretical 35w TDP
so I'm guessing that half the price of the 55W extreme processor will be waist if I switch to it one day

is there a way to add a small fan ?

 

Throttlestop and eleet tools both work to overclock the 920 or 940. It does this by forcing the turbo boost to kick in to the multiplier you set. Throttlestop allows you to adjust the TDP upward so you get all cores to booast for a longer period of time as well. Gotta be carefull with this as you are pushing the CPU with both of these techniques.

Only you can decide if its worth the cost or not.

As far as adding a fan, well you would need to heavily modify the back panel, and if you can find a narrow enough fan, then figure a way to mount it. It would be possible, not sure how practical though.

For the guy who tends to push the dual core over the quad your now tempted to the dark side, resistance is futile

 

You can definitely overclock a 920/940 in the W8xxCU. How much of the power of the extreme processor is utilized is up to you. You might take a look here: http://forum.notebookreview.com/sager-clevo/499608-additional-functions-bios-6.html#post6687876.

 

yeah I realized that my needs have changed, I need around 20% more power in multithreaded applications and a tweakable cpu

let's say I don't want to go over 85-90C with the extreme cpu
up to which frequency can I go?
Is the 160W power adapter enough or should I go for a 180W one?
as the np8760 is quite similar to the np8690 what are your input?

 

There's lots of 180's on eBay right now, I'd go for one of those.

You may want to look into undervolting your video card as well. It frees up more heat and power room.

 

I would get a 180 watt supply as they appear to be more available at this time.

As far as clocks go you need to just play with your set up to figure out how far you can push it, every CPU is different. I would slowly bump up the clocks and TDP till you reach what you think is comfortable. I use a sidebar gadget to monitor the temps when playing with the overclock, so I know where I am at.

I would be cautious to not push both the CPU and GPU hard at the same time, this Is where you could cause problems when running a higher power supply. The 8760/8790 have 2 sets of 2 MOSFETS that are used for current steering, the ones that get the current through the power supply are the ones that could get damaged by cranking on the CPU and GPU real hard at the same time. Over time this can take its toll on your system.

 

Do you know the location of these?

 

On the schematic or physically on the board?

On the board, I have no idea, I haven't even opened my machine other than to move the hard drive and install my SSD. I do plan on repasting my CPU at some point, when I do I will give the board a good look see.

On the schematic it is on page 100 of 117 on the PDF of the service manual.

Edit: I did look at the spec's on the Mosfets and actually they did a pretty good job of designing in a good margin on those. At this point, my area of concern would be how well they designed printed circuit board foil pattern to handle the high currents.
Again I would be cautious as your playing with a pretty expensive piece of harware.