940XM recommended in latest Envy 15?

I realize that the last generation Envy 15 had some thermal management issues and it would have been a bad idea to upgrade to a processor with 20% more thermal power dissipation but I've heard the new one has a lot better thermal management.

Would a 940XM be recommended, or would it cause overheating issues?

Also why has HP not rolled out the 840QM in their offerings yet?

For the record I'm experienced in building desktops from scratch.

 

940XMs still run hot and heavy like the 920XMs from what I've tested with a Q4AP. Maybe the OEM variant is different, but they both can compete with the sun under heavy load.

 

thanks for the info so far. bump.

 

not only should you be worried about thermal overload but should also check whether the standard power adapter has enough juice for this cpu.
is this a standard option on the envy?

 

No this would be an upgrade. I can afford it and the socket is compatible, but the issue is if it would be a good idea.

The 840QM, the next step down, can do 3200 mhz vs 3333mhz in turbo boost and is 1900 mhz vs 2000 mhz in normal mode and has the same TDP as the stock processor, which makes me wonder if I can get away with a 940XM.

 

imyself was contemplating getting the 920 or 940xm for my sager 8690. the sager has official support for this cpu's
however a number of people in the sager subforum have noted that during extreme conditions such as overclocking of either cpu and gpu, the 120watt power adapter does not provide adequate energy for the system.
a number of them have purchased 160 to 180 watt psu's to compensate for this.
in your case, you will most probably have a lower gpu (5850) compared to the sager 8690 (280/285/5870) requiring less power; but your power brick may be rated lower than 120watts so you could still face potential power issues.
also even if you go it to work stable at baseline speed, overclocking potential could be limited by both the thermal envelope and the power requirements.
best to ask hp and the hp subforum.

 

oh and my personal opinion would be to stick with the 840qm which is officially supported by the envy; or if you have not purchased the laptop yet, wait till next year for the (22nm?) sb-huron chipsets and cpu's if you can

 

I already purchased the computer, and need it now. Thanks for the input though, the power adapter is 120w but if it needs upgrading I wouldn't mind.

How close would an overclocked 940XM would be to a 840QM with the same cooling solution? They're close stock for stock, but for all I know the 940XM might be an OC monster.

 

@travelbug - any idea where can i purchase the 160w/180w power adapter?

 

a few members sell them. the one i know of is soviet sunrise. you will find him over the the sager subforums or the nbr marketplace

 

its 1.86 vs 2.13 stock iirc.
but the great advantage of the 940xm and its 920 sibling should be its o/c potential.
i was keen on getting the 920 myself since the price now is just 100usd or so above the 840qm. but i am kinda wary of my psu. of the few people i know who have a 920, they havent really o/'ed their cpu so i dont know how far you can actually go with this cpu or the 940 given enough power and thermal headroom.
maybe you could start a thread for 920/940 overclocking potential. i would be curious to find out myself.