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Running at 2.4GHz and Volt Mod'ing

post #1 of 11
6/14/05 at 11:07am
Thread Starter 
Hi.

I recently replaced the processor in my 9300 with a 1.8GHz 400MHz Dothan. I promptly did the 533MHz pin-out trick, and after playing with volt mods, the processor is now stable at 2.4GHz.

However, to make it stable, I had to up the voltage to 1.596. I really didn't want to go this high. I was gradually working my way up the Pentium M voltage chart (see the Intel Pentium M PDF), when I reached 1.452 volts. Unfortunately, the next step required VID3 to be high. I didn't know how to force a pin high, so I skipped to the next viable step (1.596 volts).

How can I set a pin high? Is it as simple as connecting it to a VCC?

Furthermore, I've tried several CPU utilities that let you modify the voltage. However, only one (Crystal CPU ID) let me change the voltage to a value greater than the default for the processor (1.346). Unfortunately, it doesn't appear to work. I'm not seeing a difference in heat or seeing an increase failure rate.

Does anyone know of a CPU utility that really lets you changes the CPU voltage to a value greater than it's default?

Furthermore, does anyone know of a utility that accurately reports the current CPU voltage? The utilities I've tried (Crystal CPU ID, CPU-Z, RMClock) only report the default voltage.

Thanks in advance for any assistance.

W James
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post #2 of 11
6/14/05 at 12:12pm
Google Centrino Hardware Control. To install it you need to install .net framework. This program rocks.
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post #3 of 11
6/14/05 at 12:16pm
CHC doesn't let you overvolt it, just undervolt it.

However you could use it to remove your last multiplier so you aren't running at such a high clock speed and don't need to overvolt the thing so high.
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post #4 of 11
6/14/05 at 12:39pm
Thread Starter 
Thanks for the feedback. I've thought about under-multiplying it, but it runs stable. I'd just like to lower the voltage, so it doesn't run so hot.
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post #5 of 11
6/14/05 at 2:14pm
Forcing a pin high requires either breaking off the pin or insulating it using nail polish or some other trick. As an alternative, you could keep your vid3 grounded but run vid0, 1, and 2 high using a software solution. Using the intel spec sheet chart, find out what voltage you would be at with vid 3, 0 ,1,and 2 low, then set your voltage to that with software. In other words, software undervolt your hardware overvolt.

This is what I did with my overvolt when I bring it down to 2.53 to run it stable. Instead of using 1.340, i set it to 1.324. With my pin configuration, this actually takes it from 1.644 down to what i believe is 1.580 (don't have the spec sheet up, but vid4,1,0 permanantly low.

Hope this helps you out!

I'm curious what temps you are seeing out of it under a full prime95 load and when gaming. I'm running at 2.53 65c prime and 75+ gaming... little hot but still stable. I was thinking of replacing the 755 with a 745 from a swap with a inspiron 700m.
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post #6 of 11
6/14/05 at 2:59pm
Thread Starter 
Thanks for the feedback, Lucid.

When running CPU Burn-In, the CPU temp is at about 80c. That's by far the highest temp I can generate. However, the processor still remains stable and doesn't trottle.

As for using software to lower the voltage, I haven't had much luck there. Only Crystal CPU ID will let me set the voltage to a value higher than the CPU's default of 1.340. Thus it appears to let me lower my current operating voltage from 1.596 down to 1.5 or less. However, it doesn't really appear to work. I see no temp decrease and I can set it to voltages that I've had fail with a pin volt mod.

Have you found a better software under-volting solution? Have you found any software correctly reports the current voltage of the CPU?

Thanks for your assistance.

W James
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post #7 of 11
6/14/05 at 3:27pm
Thread Starter 
Woah! I just re-read your reply, Lucid. I mis-read it the first time.

You were telling me to take the voltage from my software setting, treat it as a VID pin-out, and merge it with my hardware VID pin-out with the grounded pin-outs taking precedence. That works great!

I lowered my default voltage from 1.340 to 1.276. That's five positions down on the Intel Pentium M voltage list. Because of my particular VID grounding, my actual working voltage is decreased five positions too from 1.596 to 1.532.

The result is that my CPU temp is now about 10c less when running CPU Burn-In.

Thanks for your help. My system now rocks (and is reasonably cool).
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post #8 of 11
6/14/05 at 3:40pm
Anyone got a link to a guide on how to open the laptop, and which pins are you talking about? I've done plenty hardware mods.

I also wonder...would getting a differeng videocard BIOS with higher voltage work? I heard you can do that on 6800 GT.
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post #9 of 11
6/14/05 at 4:26pm
Wjames, sorry bout the rushed and confusing reply, read your post 3 mins before my lunch break ended. Glad I could help you out.
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post #10 of 11
6/14/05 at 4:48pm
Thread Starter 
Hi, Monarch.

For info on disassembly of the 9300 and some pin mod info, see this thread: http://www.notebookforums.com/showthread.php?t=76096

As for over-volting the 6800 Go, I haven't come across any info yet.
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post #11 of 11
9/27/05 at 7:40pm
Quote:
Originally Posted by Wjames
Woah! I just re-read your reply, Lucid. I mis-read it the first time.

You were telling me to take the voltage from my software setting, treat it as a VID pin-out, and merge it with my hardware VID pin-out with the grounded pin-outs taking precedence. That works great!

I lowered my default voltage from 1.340 to 1.276. That's five positions down on the Intel Pentium M voltage list. Because of my particular VID grounding, my actual working voltage is decreased five positions too from 1.596 to 1.532.

The result is that my CPU temp is now about 10c less when running CPU Burn-In.

Thanks for your help. My system now rocks (and is reasonably cool).
I would recommend RMClock. Just cause it can control your voltage and has a feature to let you run its custom HL command during OS idle (which drops your avg temp by a LOT). I love it!
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