The "Undervolting" Guide

[emc_2]

Dang. So I guess that i7's can't undervolted then either.

[danasht]

Wow nice knowlegde of HP's UncleWebb, I am running a P7350 :O

I didn't use any benchmarking tools, I merely ran the stress test at 1.0v for the highest multiplier shown (which was 7 not 7.5). After I rebooted everything was slow, like if i clicked the start menu button it would show up like 10 seconds later.

I'll look for the post on editing the registry though thanks!

[unclewebb]

Dang. So I guess that i7's can't undervolted then either.

Nope. Intel got rid of simple under volting when they switched to the Core i design.

Wow nice knowlegde of HP's UncleWebb, I am running a P7350

Google was my friend.

As mentioned, RM Clock does not fully support the newer Core 2 processors so unless you edit the registry, it doesn't have the ability to access any of the half multipliers. The slow menus sounds like something else was going on. When a CPU is not properly supported by a program, anything could be going on.

[danasht]

Alright, I will look into the registry editing thing, do you happen to have a guide on that as well, I don't want to mess around in the registry without knowing what I'm doing lol I assume there would be some pretty bad consequences.

I went into the registry and this is what it says in my pstatesdata binary value:

0000 06 17 01 20 07 17 01 20 ... ...
0008

[emc_2]

Went from 1.1500v and 78c @ full load to this:



Had to use ThrottleStop, since RMClock wouldn't recognize my CPU. Dropped the VID as low as it would go.

[unclewebb]

Nice work emc_2. Not everyone knows that ThrottleStop can be used for under volting Core 2 processors and it also works with the newer 45nm Core 2 CPUs and has full half multiplier support. Pretty hard to argue with those results.

danasht: The numbers in the RM Clock registry that you are looking at are broken up into groups of 4 for each multiplier. The first digit is the multiplier so the first multi in your registry picture is 06 which is the 6 multiplier. If you go over 4 positions you will see the next multiplier. That starts with a 07 so it is the data for the 7 multiplier. A leading 4 is the Intel Core 2 secret code so it will use the 0.5 multiplier. To convert 7.0 to 7.5, all you need to do is to convert 07 to 47 in the registry and that's it. You can follow this guide posted earlier in this forum.

The "Undervolting" Guide

[danasht]

thanks unclewebb,

after changing the reg for pstates from 07 to 47 it showed up in RMclock all funny like expected (71x) but still didnt allow me to go lower than a voltage of 1V?

Edit:

I just noticed under my battery power options (High performance, balanced, powersaver) there is a new RM Clock Power management section, should i select that as my battery option?

[RickyC]

Thanks for the guide, I always use to when installing a new OS.

Only read back a few pages, but is there any reason why with XP and Vista i can get below 0.9350, while with Windows 7 thats the minimum it will let me get to. 0.9350 is the maximum Im needing with my core 2 duo.

edit - My laptop froze but no bsod. Would i need higher voltage for 7? seems odd...

nvm, the lower voltages finally appeared

[unclewebb]

danasht: Did you enable DFFS, dynamic front side bus frequency switching, in RM Clock yet? You need that for voltages lower than 1.00 to work. That's on the Advanced CPU Settings page of RM Clock but isn't adjustable on all motherboards or on all CPUs.

[danasht]

Nope the DFFS switch is greyed out and I can't access it. I noticed you said that you can use throttle stop to undervolt a computer like mine, will your guide be enough to point me in the right direction?

Also if I underclock/undervolt my Nvidia graphics card using MSI afterburner is that safe and will it lower my temperatures?