dear Sirs, somebody of you knows for what are used the metallic strips on a Pentium1-120. Thank you.

Also in Pentium Pro

kennyPENTIUMpowers wrote on 2022-10-14, 17:38:

these dont have a locked multiplier do they?

Nope, they don't! That started with the slot CPUs.
All Socket 7 CPUs have an open multiplier.

Just try it. They don't produce much heat, so don't worry. Overclock it, grab an old version of Prime95 and heat the CPU up.

Here is a helpful chart: https://www.pchardwarelinks.com/cpuspeed.htm

RaiderOfLostVoodoo wrote on 2022-10-14, 22:31:

Nope, they don't! That started with the slot CPUs. All Socket 7 CPUs have an open multiplier. […]
Show full quote

kennyPENTIUMpowers wrote on 2022-10-14, 17:38:

these dont have a locked multiplier do they?

Nope, they don't! That started with the slot CPUs.
All Socket 7 CPUs have an open multiplier.

Just try it. They don't produce much heat, so don't worry. Overclock it, grab an old version of Prime95 and heat the CPU up.

Actually, There were not only locked pentium mmx chips, but also when locking these intel sometimes scrambled them, I assume unintentionally. Meaning that one motherboard setting could have as many as three results depending on what cpu specimen was used (all the same s-spec believe it or not) It seems that the pentium mmx tillamook may also have gotten 4.5x locked but 300mhz chips are so rare that I haven’t been able to confirm it. My 233 tillamooks are unlocked for 4x but can’t say if all are.

I can’t recall if the non mmx chips got locked, I believe some of them did. I would have to check my notes or test some of my chips, but I believe some were indeed locked.

So at OP, your 166 may or may not be locked but a chip like that has the possibility of 1.5, 2.0, 2.5, and 3.0 X. Using bf0, bf2 registers.

Try:
Bf0 bf1
On on
On off
Off on
Off off

Idk what those metal strips are. They aren’t part of the processor.

Overclocking Guide:

Overclocking The Intel Pentium

melbar wrote on 2022-10-15, 04:11:

Overclocking Guide:

Overclocking The Intel Pentium

It’s interesting that it claims that they disabled a bf pin to lock the cpu this wouldn’t by its self explain the scrambling I observed.

I should test a batch of cpus and see if I can find a difference on the bf pins between locked and unlocked ones with a ohm meter.

The metallic strip i usually find in a Pentium cpu installed in a IBM socket5/7 computer. In my experience If you have a PPGA cpu (the black plastic version) 100% that the 166mhz version work perfectly at 200. I have a regule 166mhz and 200mhz version ad both work perfect at 200 without overvolting and at the same temperature. My opinion is that the cpu coma from the same wafer, just marketing to sold 166 or 200mhz primted on.

ok im back with my first test report..

this is for cpu 2 = su072 1997 week 07

it seems to run stable at 3x66 (200)... POST's and will run basic bench marks and brief windows session ran fine ..
ran the phils benchmark pack.. all stable..

now the main issue is it doesnt show up as 200Mhz, it shows 166 at the POST screen.. this may be due to having an older BIOS mar 96 ... the p200 didnt exist back in mar 96... it does show as 200 on CHKCPU program from the dosbench pack..

so to see if it is really running faster i did the quake bench 640x4.. tests..
FPS figures are:
100mhz = 10.3
133mhz = 11.9
166mhz = 12.8
200mhz = 13.6

so yes it is running faster at 200 than at 166 but wow thats pretty poor frame rate increase for the clock speed increase.. (yeah yeah video cards etc)

6.25% real world difference for a 20% clock increase
look at the 133/166 difference .. 7.5% for 24% clock increase...

and you know what is pretty wrong ... jumping in on someone else's thread with your own post and contributing nothing to this one

What does cpu-z or memtest say? Speedsys?

kennyPENTIUMpowers wrote on 2022-10-15, 06:00:

and you know what is pretty wrong ... jumping in on someone else's thread with your own post and contributing nothing to this one

whaaattt???

AlessandroB wrote on 2022-10-15, 06:10:

kennyPENTIUMpowers wrote on 2022-10-15, 06:00:

and you know what is pretty wrong ... jumping in on someone else's thread with your own post and contributing nothing to this one

whaaattt???

i was talking about jnemo2004 .. the guy u were answering about the metal strip to ..
his first post ever is a thread bomb .. should be totally ignored

Sphere478 wrote on 2022-10-15, 06:06:

What does cpu-z or memtest say? Speedsys?

speedsys says 66.4 x 3.0 199.1mhz ..

dont have cpu-z installed

Sounds like a success then 😀

3x is as high as the non mmx went so your next step is fsb overclocking.

kennyPENTIUMpowers wrote on 2022-10-15, 05:59:

now the main issue is it doesnt show up as 200Mhz, it shows 166 at the POST screen.. this may be due to having an older BIOS mar 96 ... the p200 didnt exist back in mar 96... it does show as 200 on CHKCPU program from the dosbench pack..

BIOS update available?
If there is no BIOS update for the board available, the i200 could still be added to the list. It's not that hard from what I've heard. One of the easiest things when modding BIOSes.

166 can be OC to 200 with great succes. 166MMX can be OC to 250MHz - with SS7 boards and 100MHz FSB. I used to run it back then.

I wouldn't care if BIOS showed wrong CPU speed.

kennyPENTIUMpowers wrote on 2022-10-15, 06:17:

AlessandroB wrote on 2022-10-15, 06:10:

kennyPENTIUMpowers wrote on 2022-10-15, 06:00:

and you know what is pretty wrong ... jumping in on someone else's thread with your own post and contributing nothing to this one

whaaattt???

i was talking about jnemo2004 .. the guy u were answering about the metal strip to ..
his first post ever is a thread bomb .. should be totally ignored

Sorry for that!. I Thought I was in the right post. Sorry again.

report 2.
long gaming session has resulted in a couple of crashes for this overclocked cpu..
about 45 mins into a Nascar racing session it freezes or produces garbage on the screen..
this is with the standard little fan cooler on it..
so to me i consider this a fail..

i havent begun to thoroughly test the other 2 cpu's yet..
of the other 2, 1 has a fan cooler and the other a solid heatsink... the fan ones have the fan stuck to them, i have no idea how to get it off and i dont really want to...
the other heatsink one is a problem because i dont remeber where i put the thermal paste..