Undervolting 4700MQ

Right now, my i7-4700mq runs pretty hot. Some people have suggested that the 4702MQ runs significantly cooler, and can prolong battery life. So would it be beneficial for me to undervolt my 4700mq to a 4702mq inside intel XTU to improve battery life and reduce heat? Also, how much performance would i lose (.2ghz)?

 

Uhm... undervolting means reducing the power intake of the CPU (to make it draw less power) without reducing its operational frequency.

I am not sure if Intel Haswell mobile series can be undervolted. For that matter, I have not seen or heard anything about people who managed to undervolt any i core series CPU since Sandy Bridge.

But if it would be possible to undervolt the 4700MQ, then you would be able to reduce its temperatures (by how much exactly is uncertain) to lower levels WITHOUT reducing its operational frequency/performance (meaning, you would be able to leave it at 2.4GhZ base clock).

 

You can probably undervolt using the Intel XTU software. I'm not sure if anybody has tried with a Y410p, but many people have undervolted the 4700mq in other computers.

 

This guy on the Lenovo forums undervolted his. And i'm using XTU. I just wanna know the advantages of undervolting, or if it is just pointless.

 

http://forum.notebookreview.com/hardware-components-aftermarket-upgrades/721000-i7-4700mq-47-watt-vs-i7-4702mq-37-watt.html
you should read this

 

Already read it :x

Apparently since they consume the same on idle, this makes undervolting irrelevant unless i want to downgrade to a smaller PSU, despite the fact that if i turn off my Nvidia GPU i can run on a 65W adapter

Only question left: Will this improve my temps?

 

Undervolting could improve temperature, as it basically forces the processor to be more efficient, which eliminates some of the wasted energy that would otherwise get converted to heat. However, the degree to which undervolting a Haswell chip, which already has a lot of energy-saving technology included (such as lower-powered sleep states), would affect the temperature is unknown. It would most likely be a comparatively minor drop.

 

idle temps will not be lowered so much, since cpu is efficient enough already at idle
load temps will be lowered by 5-8. ( ~100mV negative offset)

 

Undervolting WILL reduce your temperatures, but only when the CPU is stressed. Messing with idle voltages is not really necessary or beneficial because Intel already employs numerous tweaks to reduce power consumption in idle mode.

You should be able to witness a drop in temperatures from 5 to 10 degrees Celsius - its certainly worth it.

In addition... you could check how the thermal paste was applied to the CPU and then re-apply it if possible to gain better results.
Manufacturers often messed up thermal grease application by putting too much, which reduced heat transfer.

 

Yes, undervolting is back with Haswell, that's pretty much the best feature about Haswell. It's a dynamic undervolt, which means that the cpu is undervolted at all p-states from idling to full load. Pretty cool. Just undervolt by -100mV and enjoy a drastic temps drop and easily 10W less at full load. And cherry on the cake, once you put the settings in XTU, they always stick even after wake or reboot. And you can lock your cpu at whatever multiplier you want for 1,2,3 and 4 cores to contain your temps if needed. It's just awesome.

So yeah there is pretty much no point in buying a 37W cpu as far as Haswell is concerned.

 

good offer

 

Thanks!

I undervolted the dynamic core by -100mv!

2 more questions:
- Will i get an endless reboot loop?
- Can i undervolt my Nehalem i3 too?