M15x 920XM multi limits?

I tried the other day to set 25\25\25\30 multis for my 920xm and the machine simply BSODed on me and restarted.

I can run up to 25x across all 4 cores even fully loaded for hours at 87\60W tdp tdc/ But if I got to 26x across all 4 cores then again instant bluescreen.

Even on one core only up to 28x will work. Changing the tdp/tdc doesn:t help in terms of stability.

Is this normal. Why can:t I push further than 28x on one core when I can run 25x across 8 threads for hours on end? I understand 26x being unstable but 1 core at 29x surely uses alot less power than running fully loaded even at 25x??

Has anybody else tried and got futher? I was really hoping to set one core at 31x so my chip can run at true 2860qm levels (15% slower clock for clock so need for large OC).

 

The problem isn't power draw, it's stability. Desktop nehalem chips can't do 3.8 on less than stock voltage, that's basically what a 920XM is. Even if it didn't BSOD, it would still be spitting out errors everywhere under load.

 

Fair enough. I guess I will have to settle for 25/25/28/28!

I may try the fsb OCing route to see if my board is OCable too. Still tis a shame!

 

You're still doing pretty well, I can only get just over 20 under full load before it hits 90c.

 

Yeah thats a pretty good OC, i beleive it was slv7 that post a couple of times before that he got x31 with a hardware mod(pin mod i believe)

 

Yeah, hahaha, this CPU can clock like crazy if there's enough voltage. Here's a wPrime 32m @ 4.2GHz which beats most desktop 920

And there's a Vantage run (CPU tests) @ 30x in the benchmark thread. I did benchmarks run at up to 32x stable.

 

That was at 1.2v, right?

 

About 1.45V

 

Ok lol. In this case I will simply be happy that I can run 8 threads 100% load for hours on end at 3.33ghz!

Cheers for the input. At this setting I get up to 95C on hottest core already and only in ambient 20C. This means during the summer I can forget 25x lol

 

Whether 100% on 8 threads at 25x for hours will work mainly depends on what kind of calculations the CPU is doing. What exactly are doing?

 

It works for me at 87/60 tdp/tdc which is why I can maintain it.

Video encoding mainly using handbrake for full 1080p bluray mkv encodes. I have also tested it using folding at home which is also stable for as long as I want and prime 95 too (small ffts). Temps though start getting pretty high at these clock speeds as you of all people know. Even with sustainably low tdp/tdc requirements compared with many the cpu will easily get into the 90s in ambient temps of around 20C after many hours.

I usually run it therefore at 24x or simply at 20x for quieter operation. For high OCing I always run the fans full speed both CPU and GPU.

Setting to 26x however triggers an immediate BSOD. Even if the CPU isn't loaded at all. For one core same applies for 29x or above.