Undervolting Culv intel /Tm2t

[r3fr4cti0n]

Any one know of a guide to under volt a Culv Intel has locked the lowest voltage to 0.9875v. i heard Crystal CPUID can lower it more, can some one confirm this?

[Synergi]

Originally Posted by r3fr4cti0n

Any one know of a guide to under volt a Culv Intel has locked the lowest voltage to 0.9875v. i heard Crystal CPUID can lower it more, can some one confirm this?

How much extra battery life is the under volt giving you?

[heatlesssun]

Originally Posted by Synergi

How much extra battery life is the under volt giving you?

Good question. I've been researching this and I think I know who to do it when my tm2 arrives. Thing is though like any over/under clocking procedure YYMV as every CPU has its individual power characteristics, though as a group stepping tend to behave similarly.

You really have to run stability tests though like Prime 95 and that does take some time.

[Synergi]

Originally Posted by heatlesssun

Good question. I've been researching this and I think I know who to do it when my tm2 arrives. Thing is though like any over/under clocking procedure YYMV as every CPU has its individual power characteristics, though as a group stepping tend to behave similarly.

You really have to run stability tests though like Prime 95 and that does take some time.

I'd love to get the battery to last at least 7 hours. I wonder what HP is basing their 9 and 10 hours on. So far everyone has said maybe 5 hours. Although that is pretty good for a laptop that size. Disabling bluetooth can usually help stretch out battery life if your not using it.

[heatlesssun]

Originally Posted by Synergi

I'd love to get the battery to last at least 7 hours. I wonder what HP is basing their 9 and 10 hours on. So far everyone has said maybe 5 hours. Although that is pretty good for a laptop that size. Disabling bluetooth can usually help stretch out battery life if your not using it.

I think Lisa was running her tests in balanced mode. My guess is that power saver would be close to the HP number.

[sharaktengu]

First for people that don't know undervolting is not the same thing as under/over clocking, it's 100% safe and you get 100% power for a lower voltage.

Second: the power mode you choose ofcourse improves battery life but it's more related to how much resources your machine is using at that time, For example if your playing hd movies non stop even in power saver, the battery will go down fast. But if you use only programs like Word and Onenote then you will get very close to the maximum battery(Don't forget about screen brightness).

Some programs like old versions of WinAmp have certain bugs that cause huge cpu usage that drains your battery so I recommend you always check the cpu usage. When webbrowsing, adding a addblocker(or java or something) increases the battery since you use less resources.

I also recommend installing battery bar(it callibrates itself over time) to get a much more accurate life estimate.
http://osirisdevelopment.com/BatteryBar/

[heatlesssun]

Originally Posted by sharaktengu

First for people that don't know undervolting is not the same thing as under/over clocking, it's 100% safe and you get 100% power for a lower voltage.

The main difference between undervolting and under/over clocking is that you are simply changing the CPU voltage with undervolting. It is indeed safe, actually under/over clocking is pretty much as safe as on modern CPUs as they have safe guards against overheating, but you still need to validate that your processor can run stably at the designated voltage.

Plus as I said earlier, individual CPUs have different power signatures, some can run 100% stable on less power than others so the only way to determine your optimal voltage is through trial and error testing though typically CPUs in the same stepping tend to have a very similar voltage range.

[r3fr4cti0n]

Originally Posted by heatlesssun

Good question. I've been researching this and I think I know who to do it when my tm2 arrives. Thing is though like any over/under clocking procedure YYMV as every CPU has its individual power characteristics, though as a group stepping tend to behave similarly.

You really have to run stability tests though like Prime 95 and that does take some time.

ive read that Intel has locked the lowest voltage to 0.9875v on culv chips. i think Crystal CPUID can lower it but the tradtional ways for intel chips dont work? Where did you find how to undervolt a Culv and how long till you get you computer so i am really stoked about the battery times and to see if its even possible possibly with UV a culv, we may get up to an hour more !!

[heatlesssun]

Originally Posted by r3fr4cti0n

ive read that Intel has locked the lowest voltage to 0.9875v on culv chips. i think Crystal CPUID can lower it but the tradtional ways for intel chips dont work? Where did you find how to undervolt a Culv and how long till you get you computer so i am really stoked about the battery times and to see if its even possible possibly with UV a culv, we may get up to an hour more !!

This looks to be a pretty comprehensive guide: http://www.clunk.org.uk/forums/guide...processor.html

Of course I have no idea if this will work on a tm2 which I should have be Wednesday, that the FedEx delivery date.

If someone has time before then I'd love to see the results but this is take a lot of testing. You have to establish a power baseline then get the volting to work and then test again and then test the OC so this a good day or two of work and time. And of course every's mileage will vary as well.

And of course if this undervolt did work and you went to power saver mode, well you looking at double digit hours of power. Intriguing indeed.

[jkenny23]

I think undervolting a "consumer ultra low voltage" processor seems a little unnecessary, since Intel basically already did that for you.

If you want to get really serious, you could do a BSEL pin mod (which in the tm2's case, would require soldering wires into vias on the back of the motherboard where the processor lies, if it's not impossible altogether) as seen here: http://forum.notebookreview.com/showthread.php?t=390696
Or, you might want to check out this guide, which suggests to change your processors "super low frequency mode" to do more work and enter idle faster: http://forum.notebookreview.com/show....php?p=3663425