Undervolting an ULV Processor

Hi everyone, I had an i7-4500U processor and i've undervolted to gain more battery life and decrease temperature, up to now i reached a -70 mV of dynamic offset and -100 mV of processor cache offset. Is there anyone that have done this? I mean in general on a ulv processor...

 

What software did you use to do this? Back in the day you could use RMClock to undervolt anything up to a Core 2 Duo, but I haven't heard of any software working on anything newer. At least back in the day you could get pretty significant savings at load, though not too much at idle

 

Intel extreme tuning utility

Inviato dal mio Nexus 4 utilizzando Tapatalk

 

Hey!
I also have used the intel extreme tuning utility for undervolting on my notebook with that same processor.
But I read in several forums, that tampering with the cache voltage may result in CPU damage- so i did keep my hands away from that one. If you know a little bit about computer architecture, that caution with the cache seems important! So don't try to reduce that much. As far as undervolting the dynamic offset goes- I tried that up to -70, but when the Laptop was under full Load (gaming with all settings on MAX and only 20 FPS), it periodically did shut down. This happened even with -35mV. As far as -30 mV it is stable but I experience in some use cases laggy behavior, a little stutter or something like that. So I am currently testing, if my temperatures do even change with undervolting- if it is not much (only 1° C or sth alike), I will stop my attempts to undervolt completely.
How works your machine? Maybe you got a better die?

 

Are you sure it is actually dropping the voltages on the chip? I thought Intel didn't allow you to tinker around with the non K/X chips in any way (over or under).

 

The k and extreme chips are just easier to overclock and are ""supposedly" made to be overclocked.

Personally I would not under volt a ulv processor. I know one of my friends did it but he did notice a mediocre performance decrease but it was about a month ago and any long -term damage would not be apparent yet. If you are really desperate and have the money then see if you can get some lower voltage ram ddr3l( will not help battery life significantly) or just replace your primary hard drive with low voltage ssd(if you have the cash).

Even though you probably know this already if you have a discrete gpu then obviously disable it unless gaming.

Hope it helps!

 

Yep, with Haswell its easy to do as the regulator is integrated into the CPU. This feature will likely be coming to ThrottleStop very soon.

 

Thanks. Did know about the on-chip VR. Didn't know it could be controlled by the user.

 

Many desktop motherboards allow the user to tinker with the VR chip. Also up until Haswell, you could always do a volt mod the old fashioned way with soldering on wires and variable resistors.

Since when can you hurt a processor by undervolting it?

 

I am on a Dell Inspiron 7537 and i've achieved -70mv of processor voltage, -100mv on processor cache and -100mv on graphics. I've notice that the laptop is more "fragile" on a processor cache voltage change too.