HP/Compaq :: DV2 Undervolting: Get At Least 25% More Battery Life
May 6, 2009
Following the excellent flipfire's undervolting guide and inspired by Silvr6's experience with undervolting his dv2, I decided to give it a try and...I was able to increase the battery lifetime from almost shameful 2h 25 minutes to 3h 30 minutes for mpeg 2 play, or even to 4h 20 minutes (light browsing and lots of reading). So, you get at least 25-30% more battery lifetime. This makes me like my dv2 a lot more!
Perhaps, it's the noted AMD's tendency to overvolt their CPUs, perhaps something else, but I was able to get the following 100% stable (in my case) voltages:
4.0x-0.6875 V
4.5x-0.7125 V
5.0x-0.7250 V
5.5x-0.7500 V
6.0x-0.7750 V
6.5x-0.8000 V
7.0x-0.8000 V (yes, it’s 0.8V again)
7.5x-0.8250 V
8.0x-8.5000 V
these voltages are stable for my particular CPU; yours might be slightly lower or higher. For example, Slvr6 was able to get a bit lower with 4x – 0.675 V. Read the undervolting guide!
But I hope that the table above will encourage you to try the undervolting (btw, unlike the overclocking it’s 100% safe), since the benefits for dv2 and AMD’s “neo” are so dramatic!...........
Anyone have something similar (even if one component is off) and can tell me how long their unit lasts on battery?
I'm thinking of jumping on the 8730 deal that's going on and battery life is the main thing that would make me choose this over something else.
(I had an 8710 with T9600 processor and the Quadro FX3600 and it got 3.5 hours on power saving profile. Wondering if the QX9300 kills battery life, because a Dell M6400 with that in it gets only 1 hour 45 minutes.)
I am considering buying a 8530w with a intel x9100 and 7200rpm drive. What kind of battery life can expect from this with power save mode on doing web work or watching a blu-ray disc?
I am considering a blu ray laptop. HP's DV7 comes with a 128MB dedicated video at Best Buy. The DV7 at Walmart comes with 1GB of dedicated video. Will the 1GB video be that much worse than 128MB for battery life?
The BB Laptop with 128MB says 5hrs 15min, the WM laptop does not say.
i have purchased a new HP laptop DV5 1215 TX [url] [basically Intel c2d, 2.2ghz (t6600), nvidia 9600M GT] when on its 6cell battery , it only gives about 1 hr 40 mins, regardless of use, i.e. playing crysis or running internet.Is it acceptable for these specs or is there genuinely a problem with the battery?. in either case bluetooth , wifi was turned off, dvdrom was not in use as well.
Grabbed a display model of the DV4T-1147CL from Sams Club yesterday for 599.99 + tx.
Configured as:
14.1 high def brightview infinity display 4gb 64bit vista home sp1 320gb drive dvd+/-R drive 6-cell battery intel 5100 wifi wireless N/bluetooth T5800 Geforce 9200M GS w/ 512 ddr2
Pretty nice overall, however the battery life is horrendous!
High performance power plan w/ default settings for the plan, with wireless/bluetooth on, web surfing, some youtube playback = 90 minutes!
balanced w/ same use as above =120 minutes
power saver w/ above: 145 minutes. (just shy of 2 1/2hr).
The unit was on display for about 1 1/2 month and did have the battery in it from the start, and was always plugged in. Did this damage the battery , or is it just normal for this high of battery consumption?
Got a new laptop a few days back (6730b), which is alot nicer than the nx7400 i had. When i got it, it came with vista business and a whole load of 'bloatware' i didnt need. so i did as i normally do and formatted the pc and re-installed vista (although XP was very tempting). I finally got round to getting everything how i want it but i've realised since formatting the battery life seems to be less than it used to be....
before the format, when the battery was full it would say i had 4hrs+ of battery life (i even remember seeing it say 5hrs once). Now it says 2hr 30 mins on 'HP optimized', 2hr 45 on power save!
I just got a new envy 15 the other day. There is a high pitched noise that is kind of annoying, but I'll be using the laptop at a cafe 90% of the time and probably won't notice it. I'm pretty happy with the laptop otherwise.
Does anybody have any tips on increasing the battery life? Other than screen brightness and lowering the "maximum processor state" in the power plan, are there any other settings i should be aware of? I've read posts claiming to have increased battery life of an i7 envy 15 to 4-5+ hours. I think I'll be pretty happy if I can squeeze 3+ hours on my i5...
I have the following set-up on my DM3T that is getting 4.5-5 hours of battery life at a maximum with light use, ie: lowest screen brightness, wifi off, word processing. I am not running any background programs (anti-virus) or anything else that is resource intensive.
Why am I getting less than 5 hours of battery life on a unit with low specs that is supposed to get "up to" 10 hours?? Is this consistent with what everyone else is getting? Battery bar currently says that my battery's 'full lifetime' is 4:58. I just returned an Acer timeline that had the same processor and 3gb of ram instead of 4, and that thing was getting 8-10 hours easily.
I spent a couple hours reading through dozens of pages in the 3 separate HP Envy 15" Owner's Lounge threads and couldn't find a definite answer to the following questions--there was usually conflicting info.
In total there's over 1k pages, so despite considerable time spent perusing and searching perhaps I missed a definite answer somewhere in there. So hopefully, it's okay if I ask this outside of those threads for a conclusive answer:
1) Every review I've read mentioned the heat issue with the i7 system. Has anyone read an official review or gathered a consensus from users if the i5 version of the 15" model has lesser heat issues?
2) Does the i5 have graphics switching? And does the i7?
3) The i7 has very short battery life, which dissuades me from getting it. Is the i5 any better? What sort of usage are most i5 owners getting out of it?
Is there anyway i could undervolt my DV5Z so i can squeeze some more battery life out of it I wanna know any software that can support my AMD processor for it
I undervolted my notebook to some values, the temperature did drop by quite some decent degrees, but i want to get it to the limit, what's the stable values you guys mostly got on your dv5? (im intested in those with similar configuration to mine - see sig)
I've just got my 8540p and I am looking for some undervolting tool for the Core i7-620M procesor and also some underclocking tool for the nVidia NVS 5100M.
I just wanted to share my experience on undervolting my HDX 18t 1103EA, Intel Quad 9000-2Ghz, 4GB DDR3 RAM, 9600M GT-1gb, Vista x64. After reading and trying the undervolting guide (thanks to flipfire), I couldn't make rmclock to work. Anyway because Q9000 has only 4 multipliers: 6x, 6.5x, 7x and 7.5x and rmclock does not support half ones, I decided to try CrystalCPUID. It can do only three ones and I choose 6x, 7x and 7.5x. I managed to go down to 1.163- stable on all three. CrystalCPUID would not allow any lower than that, although according to Intel Q9000 lowest voltage is 1.050. Strange enough both CPU-Z and Everest show that this the actual voltage when CrystalCPUID is active. Also when it is not active the cpu works only on the highest multiplier- 7.5x. My idle temp didn't really changed- it is always around 48C-55C (no AC in my room). I tried to buy CpuGenie (10 euro is nothing for some extra life on a 1300 euro mashine, but paypal asks for registration and I don't want to register.
I am looking for real world feedback for the 6 cell battery on the XPS 16. This would be mainly word processing and Internet surfing, with the screen at about 1/2 brightness
I'm new to OS X, got my MacBook the other day, and I can hands down say it's my favorite OS I've dealt with. It's so much simpler and just plain awesome. Okay, I'll ask my question before I get carried away...
So, I did some searching on Google after I noticed that my battery likes to hang around 99%. Apparently this is common. My question is, is this a BAD thing? When I see 99% I'm picturing that the computer is constantly pushing power into the battery so it can reach 100%. I mean, isn't that how fires start?
Simply put, is my MacBook trying to charge the battery consistently when it is not at 100%?
every time I'm running my uMBP from battery, I'm constantly checking the amount of time I have left and trying to figure ways to increase that time. Yes, CONSTANTLY. Whenever I can, I'm using the a/c adapter.
Even though I may see 6-7 hours left, I'm still not satisfied.
And just about every time I am running the battery, I'll open up Coconut Battery to make sure I still have a 100% charge hold left....even though my umbp is 7 weeks old with only 4 cycles...
1 – Keyboard. When I type cursor seems to jump around a lot. I would be typing and suddenly the cursor is in the middle of the previous sentence and it’s a mess. Is that something common, is that me or is that something I need to call Dell?
2 – Battery life is extremely short. I hear of such thing as deactivating your video card ( I have GeForce 8600 GT) and that supposedly helps you with the battery life. Does this laptop offer such opportunity?
Why is the Studio XPS 13 so terrible on battery life? ~2.5 hours on power saving mode, 1 on high-performance. I believe the Sony Z rates around 3-5 hours on power saving, as does the Latitude 6400. Is it normal to have this low of a battery life for a 13.3"?
What is draining all the power? How does the Z pull 4-5 hours on its battery life?
I don't want to shell out for a 9-cell and also have to deal with the added weight... but this is ridiculous.
Also, are there any new deals for the 9-cell batteries?
Here a bit of summary of how to enable some advance power plan settings, the highlights are disabling the core parking override and max % of unparked cores.
-Windows by defaults keeps at least one logical core active per physical processor core. With the nehalem architecture parked cores consume almost no power. -Also keep in mind if you set max unparked cores to 50% it may still activate all cores because 50% of 8 hyperthreaded cores is 4. -You can use resource monitor to see if cores are parking -once you've done the registry tweaks below you should have some extra options in your advanced power plan settings -Setting you power plan back to defaults nulls you the changes to it is harmless and reversable if you are careful -If you are not comfortable making registry changes don't do this as you can really screw your computer up, if you mess up the wrong things in your registry
Open Regedit (type regedit into the startmenu search box)
Expand location to: HKEY_LOCAL_MACHINESYSTEMCurrentControlSetControlPowerPowerSettings54533251-82be-4824-96c1-47b60b740d00
In order to enable some advanced power plan settings you will have to rename the REG_DWORD "Attributes" to "_Attributes". This one it own does not change how your computer runs, it simply adds an extra option into your advanced settings for each power plan
Here are the relevant registry keys: 0cc5b647-c1df-4637-891a-dec35c318583 lets you set the minimum number of unparked cores (I set this to 25% for power saver)
3b04d4fd-1cc7-4f23-ab1c-d1337819c4bb turns on additional processor throttle states, caution this throttled my laptop to the point that it was almost unusable you can change the attribute to _attribute but leave the power plan setting disabled.
447235c7-6a8d-4cc0-8e24-9eaf70b96e2b Sets the processor power state when parked, I think the default is ok
5d76a2ca-e8c0-402f-a133-2158492d58ad Option to Disable processor idle states, not really relevant on a laptop
a55612aa-f624-42c6-a443-7397d064c04f Processor core parking override, this one is key, it you don't disable this in your power plan settings you will only park "virtual" cores
ea062031-0e34-4ff1-9b6d-eb1059334028 Maximum number of unparked cores, this is useful to put your computer into "dual core mode" in power saver if you set this to 25% or 50%
I have a e6400 with SSD, a P series processor, LED screen and 9 cell battery. On the balanced mode, it is at 94% and 2h32m left. That sounds REALLY low to me. I have WiFi on, brightness up, etc. but still sounds extremely low.
i like having my m1530 on my lap (unplugged) in the living room while i watch tv/babysit so far i can only make it last 2 hours at the most(surfing the web,messengers) with the brightness 30% and powersaver mode.
well i was reading on the thread on how to underclock your cpu...theres a problem with that:
-numero first im too lazy (hurts my head when i try to understand the thread,hence the "[ADVANCE]" on the title ^^")
-numero dos having a t5450 on power saver mode (50% max perfomance) is slow enough... so i tried to look for a better solution and found this...
[url]
i think its great...my battery up to 2 hours and 20-ish minutes.
Anyone running Win 7 RTM and noticing lower battery life? My 6 cell can barely push 2 hours, though its missing about 30% of its capacity due to wear. Its about 18 months old with a lot of charge and discharging. I do like Win 7, the laptop is running very snappy with it.
