I've Overclocked but what more can i do?

[actorindp]

Hi I'm new to overclocking and that is waht i'm doing my science project on this year. "Watercooling CPUs" is my topic, and to generate more heat from the CPU I'm going to overclock.

I've had a computer donated to me
and its a Pentium MMX 200.

I've gotten it up to 266, I've tried every single jumper setting (almost) and thats the highest I can get it.

Why do I get 266mhz when I try two different types of jumper settings?
And Also which settting is better to run at??

--
Cpu 2.8 v
75mhz
cpu fraction: x1.5/x3.5 (this is how its put on my motherboard)
---
I also get 266mhz at this setting
---
Cpu 3.2 v
83mhz
cpu fraction: x1.5/x3.5 (this is how its put on my motherboard)

Which is better to run at?
Anything I can do to overclock it more?

[Yodums]

Let me just say that your science project shouldn't be on a low end processor since they don't get very hot and water cooling is a big waste on it.

Those 200 P2's have unlocked multipliers although you won't get much out of it maybe 300-333-350 max.

[actorindp]

Still what can I do to get 333 out of it? Theres only so many settings the jumpers can handle.

[Pinky]

Originally posted by actorindp

Cpu 3.2 v
83mhz
cpu fraction: x1.5/x3.5 (this is how its put on my motherboard)

3.5X multiplier and 83mhz bus will get 290mhz... at 3.0V+ that should generate some heat... problem is that some PCI cards/device might not handle the 41.5mhz bus (when spec is 33mhz).

I can't say I blame you for tinkering with an older processor, I'd hate to fry something that's worth a damn :p.

[batboy]

The Pentium-I CPUs only went up to 233 default then the P-II 233 came out, so you're getting close to the limit of your 200 when you reach 266 MHz. With excellent cooling, you might reach 290 to 300 or so. Those old mobos had clock multiplier jumpers that were used for two different settings. There should be another jumper (sometimes they're unmarked) that switches the clock multiplier from low to high. In other words, the same jumper can be 1.5X or 3.5X depending on which way you have the "low/high" jumper set.

Ok, you obviously have at least 66, 75, and 83 FSB settings (and maybe some lower FSB settings too). Do you have any higher multiplier settings, like 4X? Lot of those old mobos only went up to 3.5X, but if you have $X75 that would run you up to 300 MHz.. Some of those mobos had a jumper that fixed the PCI bus at 33 MHz. If you have that jumper and enable it, then you might shoot for 3.5X83=290.5 MHz. Good luck.

[actorindp]

Originally posted by Pinky


3.5X multiplier and 83mhz bus will get 290mhz... at 3.0V+ that should generate some heat... problem is that some PCI cards/device might not handle the 41.5mhz bus (when spec is 33mhz).

I can't say I blame you for tinkering with an older processor, I'd hate to fry something that's worth a damn :p.

Well. The thing is the volatge jumpers go right from 2.9 to 3.2
there actually are two little holes where pins should be there was a setting for 3.0.

but since I'm already running at that multiplier and bus speed, and a higher voltage, shouldn't I be getting 2.9, or does the voltage have to be lower to get a higher speed?

[Pinky]

Originally posted by actorindp


Well. The thing is the volatge jumpers go right from 2.9 to 3.2
there actually are two little holes where pins should be there was a setting for 3.0.

but since I'm already running at that multiplier and bus speed, and a higher voltage, shouldn't I be getting 2.9, or does the voltage have to be lower to get a higher speed?

As you try to run the chip faster it will require more voltage, so you up the voltage (but only if needed) as you raise the bus speed/multiplier/clock.

Be sure to only increase the voltages when you are cooling the chip with the watercooling rig, otherwise say b-bye cpu.

[actorindp]

I switched out my MB with a jumperless board thats got everything selectable in the bios

I can only seem to reach 290mhz
The Chip is originally 200mhz Pentium MMX
thats at 3.0 v
multiplier 1/5/3.5
Mhz 83

what should i try to make it higher.
I'm using watercooling, so I'm not so concerned about raising the temp.

[Pinky]

If the PC will run at 5X multiplier and 66/75/83MHZ bus, then those are the highest settings there are...

[actorindp]

Well the board can also run at 100mhz

Now help me clear something up.
If I'm running the same settings, can the chip run at different speeds depending on its temperature?

Like if its on the hot side be at 266

but if its on the cool side be at 290?


-Nick

[Lancelot]

Some of the Pentium MMX's with the new plastic packaging (instead of the ceramic housing) came with a locked-muliplier. We have two in my family. One is locked and running at 225Mhz (3*75), the other is on a OEM Packard Bell mobo (no 75/83Mhz option) but unlocked so she's running at 233Mhz (3.5*66). Try to find out if your CPU is locked or not. Sometimes setting a multiplier of 1.5 will be seen as 3.5 by the Pentium MMX.