Help! O/clocking MMX 166 / Mobo Giga-Byte GA-586T2

[talidyce]

Hello Folks!
I've been trying to squeeze the last juice out of my machine but with no success. My system is made-up of:
System Spec:
M/board: Giga-Byte GA586T2 with Triton TX430 chipset.
CPU: Pentium MMX 166 MHz (BP80503166 SL2FP/2.8V)
RAM: 128 MB sdram pc133
HDD: Samsung 4.3 GB
Monitor: AcerView 54eL
CDD: Diamond Data 40X
V/card: Diamond Stealth 3D 2000 with S3 virge chipset and 2MB.
S/card: Soundblaster 16.
O/S: Win 95B.
The mobo book say that it can run at 75 MHz if the jumper is closed. I tried doing that using a salvaged jumper recovered from a dead CD-ROM drive but the puter would'nt boot up. When I tried increase the multiplier, the speed either drops to 133MHz or stays at 166 MHz.
Q1 - Would the jumper from the CD drive be unsuitable for jumpering the mobo? (reason why I can't get it to run at 75 MHz?). If it is OK what else do I need to do to get the bus speed up?
Q2 - Why increasing the clock multiplier gives me the wrong effect? Detailed guidance please for what to try next.
Q3 - Would I need to modify the voltage?
Any help will be very much appreciated.
PS. The machine is used mainly for working/studying. Not a gaming machine.

[outhouse]

If the jumper is touching both pins and its getting good contact then it is probably working. I believe that the multiplier is locked so that part is not an option.i'm kind of supprised that your getting a responce when you change settings the new chips are definatly locked maybe you have a early version that is unlocked ive heard once that a few early Intel CPU's where unlocked maybe someone else could post to clear this up. You may need to up the CV only if you cant boot at higher FSB settings but you should only raise CV if your CPU is not getting hot if you do not have CV [corevoltage to CPU] settings in BIOS or on your mainboard then it would probably be best not to do any mods to it and just run it the way it is. Also if you do not have a way to check CPU temps i would think twice about upping CV you dont want to fry your PC, A very small jump in CV might work fine but if you get carried away you might end up making toast.

goodluck

[batboy]

First, all Pentium I CPUs are unlocked. Intel didn't sart locking the multipliers until early on with the P-II chips. Any jumper that fits should work. I think there's only a couple sizes anyway. Try this as a test to make sure you're playing with the right jumpers and that you're reading the order correctly. Lower the multiplier to the next lower setting (from 2.5X to 2X) and then increase the FSB to 75 MHz. If the system boots up and shows 150 MHz on the post screen, then you're doing stuff right.

[ken257]

Yes the P1's were unlocked but not the MMX line. I have that same P166mmx still floating around here someplace and it is definatly locked, multipier change did nothing so the only option was to up the fsb to 75.

Q1 - Would the jumper from the CD drive be unsuitable for jumpering the mobo? (reason why I can't get it to run at 75 MHz?). If it is OK what else do I need to do to get the bus speed up?

The jumper from the cd will work fine odds are you also have to up the voltage to make it work. The cpu prob will not reach that speed with stock voltage. Also you may be running some PCI cards out of spec try it with only a video card in the system.

Q2 - Why increasing the clock multiplier gives me the wrong effect? Detailed guidance please for what to try next.

The P166mmx that I have is multiplier locked.

Q3 - Would I need to modify the voltage?
Any help will be very much appreciated.
PS. The machine is used mainly for working/studying. Not a gaming machine.

You have to check the manual there should be some jumpers on the mobo to select voltage.

[talidyce]

Hello folks!
Thank you very much for the input. That's a bit more light than I had when I first posted. By the sound of it, my chances are slim in getting good result with that thing. Trying to up the bus speed to 75 was unsuccessful for some reasons as well. The mobo book indicates that the jumper has to be closed to raise it to the 75 level and when I do that, the machine refuses to start. Observing the fan on the cpu, I noticed it only gets like a tremour when I press the on button and stays there. I tried 4 different jumpers with the same result. Also tried jumper closed on various clock settings, same result. Does this all have to do with the chip being locked? any possible work around this?
Thank you very much for helping. Really appreciated!

[Pinky]

talidyce (Jun 12, 2001 05:04 a.m.):
Does this all have to do with the chip being locked? any possible work around this?
Thank you very much for helping. Really appreciated!

You're about done. Even with the extra juice you wouldn't get an enormous performance jump.

Welcome to the forum, you should find most of us very laid back and helpful (as we have nothing better to do!!). Wait, I mean I'm a loser... !!! Damn microsoft honesty patch!

[talidyce]

Thanks for the warm welcome Folks!
I like the ambiance!
Taking head of the suggestions made in regards to the low expectations from the MMX 166, I've located a second hand AMD K6-2 266 MHz for AUD30.00 and I'd like to give it a try. What are the o/clocking capabilities of the K6-2 266 and what to look for please?
Thank you very much again.

[Pinky]

talidyce (Jun 13, 2001 09:25 a.m.):
Thanks for the warm welcome Folks!
I like the ambiance!
Taking head of the suggestions made in regards to the low expectations from the MMX 166, I've located a second hand AMD K6-2 266 MHz for AUD30.00 and I'd like to give it a try. What are the o/clocking capabilities of the K6-2 266 and what to look for please?
Thank you very much again.

We'll have to move this string to the AMD page, since this is intended for Intel support... I personally have little or no AMD experience.