Update on Compaq laptop and overclock

Discussion relating to Socket 7 hardware.
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KHPower
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Update on Compaq laptop and overclock

Post by KHPower »

I got my laptop to run quite well @ times with the 475 ACZ @551mhz and set to 2.25 v. The system speed is quite good compare to what it used to be. I have found that my built in motherboard fan controller does not work well , meaning it doesnt turn on the fan at the needed times so I grabbed a external power supply (mini) and installed it to the cou heatsink fan on my laptop andnow it stays very cool and I had it @ 551mhz yesterday for hours running well.

Today I tried using the k6-3's I ahve thinking the new cooling system would help them run but I was dissapointed , again :cry: oh well so I put the 475 back in set @ 551 and the blue screen of windows comes up so I swithced it to 500 and running a asytem cleanup and defrag and will probably set it to 551 again.


I have a question though , I am looking at getting a 550ACZ to un in he laptop so I can maintain the 551 mhz speed without generating so much heat from overclocking. If my sytem keeps the chip cool will I have no problems with chip damage? and if I get the 550 I am wondering if I could hit 600mhz and the reason being is I am set @ 2.25 v now and I would imagine I would have to up the voltage to get it to hit those high numbersbut I only have one option on the volt settings left , 2.3 v

What do you all think?
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RE: Update on Compaq laptop and overclock

Post by Jim »

With a K6+ chip you should be able to get 600 MHz @ 2.1v
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kalabok
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Post by kalabok »

concerning chip damage - 0,3V is quite a lot. not that it should kill your 475azc, but as you want to use your compaq for a longer time, i wouldnt do that. there is no way to tell it for sure.

another thing is - i heard it here, in the k6plus forum, that these acz chips seem to have same overclockability regardless of their rating. that means your cpu should do 550mhz at 2,0V. just try out.

since your last post on voltage in the compaq laptop i was trying to understand the regularity of voltage-dip switch settings. for me its siply not logic. as you have got 4 dip switches, there should be 16 different settings for voltage. if, of course, none of them is blocked. what you can do is trying to find a program which gives you the information of cpu core voltage. then you can clock down your acz and simply try out every dip switch positins you like - and voila, all the hidden settings appear.

one last thing - since i expect to get "some more" k6-III+ cpus, i would advise you to look in the ebay item thread. this chip should run 600mhz @ 2,1V, as jim said. and its a 256kb l2 chip.
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kalabok
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Post by kalabok »

some theory on voltage setting for a lot of desktop mobos:

4 dip switches, a,b,c,d; can only have values of 0 or 1 (off/on)

initial lowest voltage Vi.

each dip switch correspond to one voltage increment, mostly the increment of b is the double of a, c the double of b and so on:

Id = 2Ic = 4Ib = 8Ia

the final voltage the cpu gets is given by this equation:

Vcore = Vi + Ia*a + Ib*b + Ic*c + Id*d

so, if Vi is 2,0V and Ia is 0,1V, switching all dips ON you will get.


Vcore = 2,0 + 15Ia = 3,5V; if all are OFF, of course, Vcore = Vi
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KHPower
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Post by KHPower »

Thanks for the info , but sadly the k6 3 does not work in my computer. It will for a short time then freeze my computer. Also , bench test marks show the 550ACZ rated higher than all of them.
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KHPower
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Post by KHPower »

I just tested the 475 @ 2.0 boots but hits the blue screen , 2.1 v hit the blue screen shortly after reaching the desktop and at 2.25 it runs fine. These voltage numbers are from the internet and I cant say if they are on target or not. Ever program I have used like CPUz and others ,I have not been able to check the voltage because it is greyed out on all the programs i have tried. I will download a few more to check but I have a feeling I will never know :(
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Post by kalabok »

khpower,

i hope you have a multimeter at home. just use a small wire, stick it in one of the marked pins below and you can mesure your Vcore without problems. use a metal coverage as ground pole.

red dots - core voltage
green dots - I/O voltage (should be 3,3V)

what you can do is power your mashine on, mesure the voltage and switch the dips on the run. the core coltage should change.

have fun!
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k6 Vcore (red) and I/O voltage<br />top socket view
k6 Vcore (red) and I/O voltage
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KHPower
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Post by KHPower »

Wow! Thanks alot! So basicly all I have to do is is stick the postive and negative in the corresponding holes and it will give me the readings?

By metal coverage do you mean the heatsinks on the other chips on the motherboard?
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Post by kalabok »

no,

just connect one wire to one of the red dots on the picture, the other wire of the multimeter you should connect to the ground pole (to close the circiut). this pole has no potential and is normally connected to all metal coverages of the laptop (such as hdd, cdrom, screws and so on). but you can also use the water tap or wet soil ...

and - you dont have to stick in the processor or the fan! the system should power on even without it.
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Post by KachiWachi »

I would be VERY CAREFUL probing the Socket 7 "holes".

Personally, I'd probe the back of the board. :wink:

To properly check the voltage on your system, a "load" should be placed on the VCore and VI/O pins...though many times this is not possible. If you have a "spare" (read: old) CPU...use that.

Thanks.
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KHPower
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Post by KHPower »

KachiWachi wrote:I would be VERY CAREFUL probing the Socket 7 "holes".

Personally, I'd probe the back of the board. :wink:

To properly check the voltage on your system, a "load" should be placed on the VCore and VI/O pins...though many times this is not possible. If you have a "spare" (read: old) CPU...use that.

Thanks.
I do happen to have a cracked 550ACK laying around , WHere on the back of the board?

I do have a Compaq 1200 motherboard I could play around with , not to check volt settings because they are not the same boards , but to find out where I can check volt settings. The 1200 mobo's and the 1600 series(mine) mobos looks identical on a first glance , but the 1200 has less dipswitches on the "settings' SW2 but has the 4 "volt'' settings SW1 , but I have no idea if the two boards use the same volt settings , I will have to do some research.

Would Compaq tech support :roll: have these volt settings? or if I call am I going to speak with a soccer mom reading from a script :roll: LOL
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Post by kalabok »

what? a 550ack? :shock:

would be great if you could tell me the exact description written on that chip.

on topic: i tested the voltage pins by my own on a k6bv3 yesterday, using the black wire of an atx powersupply as ground - it works like a charm even without a cpu. no idea, what could go wrong doing so ...
hope, kachiwachi can explain it.
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Post by KachiWachi »

Testing a Power Supply with some load on it is always better than testing it unloaded (you will get a more accurate voltage reading).

Thanks.
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Post by jpnjim »

Hey KHPower,

I got a Compaq 1692 Lappy to mod, and set up for my son to play Thomas games & watch DVD's on (he's 3.5 years old :D ).

I was originally looking for a III+, but after reading that they didn't work in your 1690, I went with a 2+.



My 1692 was originally setup as 433/96, that used the alternate bus speeds (DIP #10 in up position allows 60/66.8/91.5/96.2 front side bus speeds instead of 75/83/95/100).

In any combo, the absolute best my new K6 2+ 500ACZ could do was 551.2/100.2 @ 2.0v.

It *almost* started @ 570/95 2.1v, but then went to a black screen.
I didn't want to try 2.2v on this 2.0v core (atleast not yet anyway).


It's a brand new chip, so I might try to burn it in @ 2.1v for a while, then try 570 again.
Where you had similar luck, I am wondering if the board itself is limited to 550ish.



Have you gotten yours to go higher yet?

The other thing I'm still trying is to do is overclock the ancient Rage LT Pro video card.
There's an overclock program, I just haven't gotten it to work yet.



One last thing, you said you had a 1200 board, I also have a 1247, and when I pulled the K6-2, it showed FSB speed settings stamped on the board (under the lower heat sink).
The funny thing is, it lists 133.33 mhz as an available FSB speed 8)

A few years ago (before I found what all the dip settings were), I *somehow* stumbled onto 266/133, but wasn't duplicate it again a couple months ago.
6x 133 would be nice, but I'm betting that board will top out ~550 too (133x4 = 532 would be sweet too).
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Post by DonPedro »

jpnjim,

you are aware that with high probability you have to use sdram built for running at 133mhz when you go for a 133mhz fsb? otherwise your tests won't last last any longer than a second or two ...
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