please help

[munkey]

i have an older model cyrix200 that i had planned on over clocking but when i got it running at its posted speed "200mhz" my system lost its stability. i currently have it running fine at 166 but its really beginning to get on my nerves that i can't even run at its normal clock speed much less overclocked. if someone has any ideas let me know

 

[Kodiak]

is it "Cyrix200", supposed to be RUNNING at 200Mhz,
or one of those "Cyrix200", RATED at 200MHz, i.e. supposed to run slower but company *claims* it to be performing as good as Pentium200?
For a while Cyrix used (maybe still does) a rating system to help/confuse the consumers that was basically a "pentium-equivalence" measure, it had less to do with its actual clock-speed as much as marketing gimmick etc...

it could very well be that it is *meant* to run at 166...

 

[LTJLover]

The Cyrix PR200 CPUs ran at 150MHz I believe. The PR rating was supposedly the Intel equivalent. I have a couple Cyrix CPUs sitting around, including a Cyrix 200MX (also 150MHz). Those CPUs were practically impossible to OC anyway. In fact, I am shocked you got 166MHz out of yours. They are keychains now a days though. Ok I guess if you like DOS games and use office applications, but otherwise forget it.

Jon
"Water-Cooled CPU Runner"

 

[Kodiak]

>> They are keychains now a days

Until I came to Tom's Hardware, I though I was the only one with a keychain made of a CPU (486 Dx2/66). I felt cool, original, a complete geek
Now I see I was hardly unique 🙁

 

[Bubba]

I have a Cyrix chip in a bag in my closet.
It was a 300 but it only ran ant 233.
It also ran hotter than my Duron 600 @ 950 (well maybe not that hot, but it was hot)
It was very unstable and very slow.

 

[Mordy]

Key chain from 486dx2 ? Cool ! I think i will made a DX2 neckle.
p.s. Cyrix 6x86MX /6x86L can be overclocked .

 

[Crashman]

I'm fairly sure the the PR200 was actually a 166. If you can get it to 200 actual you might try 180, same multiplier at 60MHZ bus (instead of 66).
And if you want to speak of heat, I had a 386DX25 that ran about 65C! Now why can't I get my PIII stable at over 53C?

 

[Mordy]

It is bad idea to lower the FSB. Espetialy to lower than 66 MHZ. Go for Maximum bus speed and lower multiplier if needed, it even worth to underclock the CPU if you run it on faster bus.

 

[Crashman]

We don't yet know if his motherboard supports a 75MHZ bus speed. But 60 is only 10% slower than 66, and memory performance was not as important as CPU speed when it came to Cyrix.

 

[munkey]

well thanx for all the answers they have been very informative and dissapointing. unfortunately i am unsure of my mother boards ability to support anything other than a 66mhz bus. if anyone knows anything about overclocking any part of an M-technology mustang board let me know