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Cheap Processor Upgrade? - Page 6

post #101 of 754
4/20/05 at 10:10pm
Damn it. With my first Pentium M 715, I could get it to 2.0 @ 1.132v stable.

With the new laptop, I haven't found the lowest vcore I can run at, but at 1.132v, I BSODed. And the thing is, with my old one, it would just error out in prime if I went too low. I never had issued with BSODs on my old laptop.

Damn. Grr. I mean, it's perfectly stable at 2.0, just not with as much of an undervolt as before.


edit: i'm thinking about swapping out the two processors but it's just such a pita. i didnt even put as5 when i did the new laptop. i said to myself that i'd open it and do it later but i dont know if i will anytime soon.
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post #102 of 754
4/21/05 at 2:06am
I just got my PM 1.7 and it failed to go to 2.26 stable using the FSB pin mod. The system will boot into windows and I can even use it for simple purposes. Prime95 and SuperPI error out immediately. I loaded into WOW and was able to run around for about 60 seconds before it crashed and I was brought back to the desktop. The CPU is recognized in bios and by CPUz as being a 2.26ghz PM.

The first battle may have been lost, but the war is not over. Tomorrow night, I will try grounding a few pins in order to bump it to the max 1.7 voltage when it runs at full speed. I noticed the following voltages:

0.988
1.052
1.324

I hope by ground vid3 and Vid4, it will bump the voltage to 1.7 (instead of 1.324) when it runs at 2.26ghz.
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post #103 of 754
4/21/05 at 2:10am
That sucks stomper but at least you got a backup plan. Let us know how that 1.7v works out (seems a bit high though).
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post #104 of 754
4/21/05 at 2:16am
Quote:
Originally Posted by Stomper
I just got my PM 1.7 and it failed to go to 2.26 stable using the FSB pin mod. The system will boot into windows and I can even use it for simple purposes. Prime95 and SuperPI error out immediately. I loaded into WOW and was able to run around for about 60 seconds before it crashed and I was brought back to the desktop. The CPU is recognized in bios and by CPUz as being a 2.26ghz PM.

The first battle may have been lost, but the war is not over. Tomorrow night, I will try grounding a few pins in order to bump it to the max 1.7 voltage when it runs at full speed. I noticed the following voltages:

0.988
1.052
1.324

I hope by ground vid3 and Vid4, it will bump the voltage to 1.7 (instead of 1.324) when it runs at 2.26ghz.
1.7v seems too high. would it be possible to try 1.4v or 1.45v or somewhere in there first?
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post #105 of 754
4/21/05 at 2:23am
It might be possible to config the voltage to hit 1.4-1.5 at max speed, but its a lengthy process to get to the CPU. If I try for a voltage of 1.4, and it fails, then the next question will be, "What about 1.7?" Which means I will have to get to the CPU again.

So I figure I will just jump to 1.7 now, if it works, then great, maybe it will work at a lower voltage. But, if it fails at 1.7, then I know voltage wont fix it, and I'm only one more CPU swap away from my old PM1.6.
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post #106 of 754
4/21/05 at 2:31am
that's a good point. i'd say that you definitely shouldn't be going above 1.5v anyway (1.4v should do it).. so maybe you could try 1.5v, then use rightmark to scale down the voltage and prime to see if it's stable. then, you could open it once more and set the final vcore and be done.
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post #107 of 754
4/21/05 at 2:38am
Hmmm.. I'm still hesitant about this.. I haven't paid for the 1.7 yet I won on e-bay...

waiting on Stomper..
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post #108 of 754
4/21/05 at 2:40am
Quote:
Originally Posted by noblesin
Hmmm.. I'm still hesitant about this.. I haven't paid for the 1.7 yet I won on e-bay...

waiting on Stomper..
So you wouldn't pay for it if the mod doesn't work?
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post #109 of 754
4/21/05 at 4:35am
Quote:
Originally Posted by joseyu
So you wouldn't pay for it if the mod doesn't work?
Well.. I'm going to have to pay for it since I won the auction. But, if the mod doesn't work, It is gonna suck cause I'm gonna have to re-sell it .. doh!
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post #110 of 754
4/21/05 at 1:00pm
It's always possible that some PM1.7s can go to 2.26 while some cannot. I would at least give it a go even if my voltage bump doesnt solve my problem.
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post #111 of 754
4/21/05 at 3:25pm
Dont do 1.7 voltage, do 1.5. That will create a lot of heat that your laptop may not be able to handle
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post #112 of 754
4/22/05 at 12:30am
OK, so I grounded the vid4 jumper (I put a wire between F4 and G4). This should have made the 17x voltage 1.580 (versus 1.324). When it runs at full speed, the voltage shows 1.324 in CPUZ and RMClock. Now there are no errors. However, heat is definately an issue. When I run prime95, within 60 seconds the CPU temp shoots from 33C to 75C!

Who would have thought that .256 volts would make such a difference. The good thing is... No errors during the short 1 min test I can conduct before the CPU auto throttles down.

Im going to dissassemble it again and check to make sure the heatsink is making contact with the CPU. If everything looks good, then I will have to figure out a different voltage ground to try.

It's also possible that the voltage is not what I expected it to be. That would explain the outrageous heat jump.
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post #113 of 754
4/22/05 at 12:47am
I think I will try to ground vid3 instead of vid4. This should give a theoretical voltage of 1.452 which is only ~.13 volts more.
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post #114 of 754
4/22/05 at 12:49am
what happens if you use rmclock to undervolt?
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post #115 of 754
4/22/05 at 12:52am
RMClock shows 1.324 volts as the maximum. So it wont work to get in between 1.324 and 1.580.
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post #116 of 754
4/22/05 at 2:22am
OK, when I ground the vid3 pin, the system will no longer boot. It looks like my PM1.7 will not be able to make it to 2.26.

Now, should I get the PM1.6 or PM1.5 for the next attempt?
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post #117 of 754
4/22/05 at 3:11am
Thread Starter 
I have been looking at the clock setups for the Pentium M processors.
There are 2 settings that are listed as reserved.

Intel Datasheet

Chart goes something like this.


BSEL[1] BSEL[0]

0 1 100FSB
0 0 133FSB
1 1 Reserved
1 0 Reserved
Im wondering if you would happen if you BSEL[1] Pin with nail polish and see what happens. Thing Im wondering is, the Mobile I915 chipset is essentialy a lower powered version of the Desktop chipset. I am almost positive it is capable of higher FSB speeds than 533Mhz. I am wondering if those reserved FSB settings are 166Mhz and 200Mhz.

Hmm do I want to pull my 533FSB processor and make BSEL[1] high and see what happens.
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post #118 of 754
4/22/05 at 12:29pm
I was thinking the same thing. I bet those two reserved spots are for FSB 166 and 200. The problem is, the 915 chipset would have to be capable of running at 166 in order for the setting to work. I am doubtful.
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post #119 of 754
4/22/05 at 12:34pm
i'd say it'll probably be 200 and 266 or something maybe, but thats all determined when the bios release for the motherboards are out, because it's the motherboard that does something with what it reads from bsel
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post #120 of 754
4/22/05 at 7:05pm
If the PM1.6 (533FSB) were to run at 166FSB, it would run at 2.0ghz core and the FSB would be 667 (166x4 quadpumped)...
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