Quick question about underclocking a Pentium 2

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Re: Quick question about underclocking a Pentium 2

Postby gerwin » 2011-3-18 @ 14:03

You have a klamath Core there, Why is the result so different from swaaye's result here: viewtopic.php?t=22515
Just look at the Multiplier and FSB readings. Can you please check the L2 cache functionality with something other then Speedsys? or use speedsys v4.70?
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Re: Quick question about underclocking a Pentium 2

Postby retro games 100 » 2011-3-18 @ 14:08

Sure no problem, I can do this right now. Please can you either provide a download link for Speedsys version 4.70, or attach it to a Vogons thread. Thanks a lot.
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Re: Quick question about underclocking a Pentium 2

Postby gerwin » 2011-3-18 @ 14:24

Sorry I am not at home, nor do I have that version.. google gave me this though: http://www.freeware.ru/program_prog_id_3320.html
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Re: Quick question about underclocking a Pentium 2

Postby retro games 100 » 2011-3-18 @ 14:28

Great, thanks! Also, I have attached it to this post.
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Re: Quick question about underclocking a Pentium 2

Postby retro games 100 » 2011-3-18 @ 15:06

I have just run Speedsys version 4.70, and I get the same results as before - that is to say, a crazy looking external clock calculation, consisting of ~24 FSB and a 5.5 multi. Also, for the memory test graphic, the graphical lines look the same as before - that is, after the L1 graphic lines have been plotted, the rest of the calculation line runs along flat, and does not dip again. This suggests that L2 is not present.

Do you want me to run any further tests, with any other utilities?
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Re: Quick question about underclocking a Pentium 2

Postby retro games 100 » 2011-3-18 @ 15:20

On the Asus P2B mobo, there are 4 jumpers used to set the CPU's multiplier. Is it worth me setting these 4 jumpers to various undocumented settings, in the hope that I (a) find the 1.5x setting and it actually works, and (b) that there could be a 1x multiplier setting.
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Re: Quick question about underclocking a Pentium 2

Postby retro games 100 » 2011-3-18 @ 15:30

Are there any hardware "mods" that you can do to a P2 or P3? Imagine finding out how to deactivate their internal multiplier for example, so that it operates at 1x multi speed. That might be useful.
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Re: Quick question about underclocking a Pentium 2

Postby gerwin » 2011-3-18 @ 15:37

The 1.5x setting on my Aopen i440BX Mainboard does not work as such with semi-unlocked Deschutes Core PII's. I read it also is useless with Klamaths, but have not tested it myself.

Your readings do not match Swaaye's readings, even though you are doing the same thing. And also regarding the L2 Cache. It is possible speedsys is just messing things up. From my head I would not really know which other diagnosis is best to use. In windows I use CPU-Z, in DOS I also used Checkit. But the latter won't display multipliers and FSB...
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Re: Quick question about underclocking a Pentium 2

Postby retro games 100 » 2011-3-18 @ 15:45

You just gave me an idea. In DOS, I ran ChkCPU version 1.20. This displays the FSB and multi. But this utility also displays these crazy readings, as shown earlier in Speedsys. ChkCPU says that the multi is 5.5, and the bus is 24.2 MHz.

Edit: I am using a different board to the board that swaaye is using. I understand that he is using an FX board, whereas I am using a BX board.
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Re: Quick question about underclocking a Pentium 2

Postby swaaye » 2011-3-18 @ 17:35

I had a FX board for a bit but it was awful so I dumped it. Lots or probs. I typically use the Abit BF6 for P2. Softmenu is my friend.
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Re: Quick question about underclocking a Pentium 2

Postby retro games 100 » 2011-3-18 @ 19:00

I tried a different mobo, an i440BX-based MSI 6163 Pro board. There's a "soft menu" in the BIOS, where you can select the CPU's multi, but it only goes from 3 to 8. I tried 6.5, and it ran the P2 233 CPU at 167 MHz. The Speedsys memory graphic chart indicated that L2 was functioning OK.

I then set the CPU's multi to 6, and the P2 CPU ran at 133 MHz. Speedsys indicated that L2 was not active. Also, Speedsys correctly reported that the system was running at "2x & 66". I then set the multi to 5.5 and 5, and the CPU also ran at 133 MHz. However, Speedsys reported that the multi was in fact these specific values: 5.5 and 5, and that the bus speed was a very low value, about ~20-25.

I also overclocked the P2, with a multi of 4 and that worked. For all of these tests above, I could not decrease the Speedsys score so that it was under ~150.
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Re: Quick question about underclocking a Pentium 2

Postby swaaye » 2011-3-18 @ 19:55

This is where the later BX boards are most friendly. With each generation they added more flexibility to the overclocking features.
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Re: Quick question about underclocking a Pentium 2

Postby AdamP » 2011-3-19 @ 03:16

Tetrium wrote:Link to the other P2 unlock thread: viewtopic.php?t=24550&postdays=0&postorder=asc&start=20

My findings so far:
SL2QF (333Mhz Deschutes) - Unlocked
SL2S7 (400Mhz Deschutes) - Unlocked
SL2HE (300Mhz Klamath) - Unlocked

SL2U3 (350Mhz Deschutes) - Locked
SL2VY (300Mhz Deschutes) - Locked


1. The SL2HE is 266mhz, not 300mhz. The SL2HA is 300mhz.

2. I haven't confirmed this, but I thought that no Deschutes was completely unlocked, only limited (ie you can underclock but not overclock).
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Re: Quick question about underclocking a Pentium 2

Postby Tetrium » 2011-3-19 @ 03:40

AdamP wrote:
Tetrium wrote:Link to the other P2 unlock thread: viewtopic.php?t=24550&postdays=0&postorder=asc&start=20

My findings so far:
SL2QF (333Mhz Deschutes) - Unlocked
SL2S7 (400Mhz Deschutes) - Unlocked
SL2HE (300Mhz Klamath) - Unlocked

SL2U3 (350Mhz Deschutes) - Locked
SL2VY (300Mhz Deschutes) - Locked


1. The SL2HE is 266mhz, not 300mhz. The SL2HA is 300mhz.

2. I haven't confirmed this, but I thought that no Deschutes was completely unlocked, only limited (ie you can underclock but not overclock).

You're right!

I'll go correct it now. Dunno what CPU I tested then :P

Btw, slowest I've gotten a P2 is 100Mhz (probably 2x50Mhz?)
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Re: Quick question about underclocking a Pentium 2

Postby retro games 100 » 2011-3-20 @ 12:37

Tetrium wrote:Btw, slowest I've gotten a P2 is 100Mhz (probably 2x50Mhz?)

It would be very interesting to learn how you did this. Can you remember any details please? Thanks.
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Re: Quick question about underclocking a Pentium 2

Postby Tetrium » 2011-3-20 @ 15:11

retro games 100 wrote:
Tetrium wrote:Btw, slowest I've gotten a P2 is 100Mhz (probably 2x50Mhz?)

It would be very interesting to learn how you did this. Can you remember any details please? Thanks.

I'm pretty sure I just lowered the fsb to 50Mhz. Many 440LX boards support that fsb but many BX's might not.
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Re: Quick question about underclocking a Pentium 2

Postby retro games 100 » 2011-3-20 @ 15:13

Yes of course. I was forgetting about mobos such as the LX before the i440BX.
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Re: Quick question about underclocking a Pentium 2

Postby Malik » 2011-4-08 @ 06:27

Hmmm...there are quite a number of SL2S7 cpus on ebay now. Getting one to see if I can actually reduce the number of PCs in my room. But it ain't gonna replace my 486!
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Re: Quick question about underclocking a Pentium 2

Postby gerwin » 2011-4-12 @ 19:03

gerwin wrote:regarding the L2 Cache. It is possible speedsys is just messing things up. From my head I would not really know which other diagnosis is best to use.

I assembled a system and had the opportunity to have another look at the L2 cache. So there is this Deschutes core P-II 333MHz on an Aopen AX6BC. I put it at 2x66Mhz and later at 2x100MHz. WCPU v3 for windows reported no L2 cache at these settings. So it is the same as what speedsys already said.
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Re: Quick question about underclocking a Pentium 2

Postby Malik » 2011-4-19 @ 01:52

Ok, got one SL2S7 (Deschutes 400MHz) from BlackmoreIT.

Here's the processor :

It's one big papa heatsink! Anyway, I prefer passive heatsinks to those with fans. I prefer "cool and quiet" :happyhappy:.

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Fair enough, it's unlocked :

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[/img]http://farm6.static.flickr.com/5230/5633297826_7c07ac9c55_b.jpg[/img]

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Pentium 133MHz with MMX! Hehehe...

Maybe I have found my "ALL-IN-ONE" Dos-Win9x-esque Pentium Generation PC, covering from a humble 133Mhz to a 400MHz Pentium-III like speed.

Speaking of the 400MHz, what is the difference between a PII 400 and PIII 400?
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