problems with gl games after overclocking cpu...

[phedex]

After overclocking my bus to 83, my cpu to
200 (cyrix 200mmx) it doesnt allow me to play gl games. i use a voodoo 2 12 meg board. anyone have an idea as to WHY?

[Target]

Any time you increase your FSB speed, you also increase the PCI and AGP bus speeds on your mother board as well, because all other bus speeds on the board are a fraction of the FSB.

I am guessing that your Video Card is a PCI, and that your PCI clock divider is 1/2. If so, that would mean that your PCI bus speed is running at (83x1)/2 = 41.5Mhz. This is a fairly high over-clock for the PCI bus from its rated speed of 33Mhz, and your video card may not be able to handle it. If you have other dividers (say like 1/3) try that. If you don't have anything else to choose from, try a FSB setting of 75Mhz and see if that resolves you issue.

If your video card is an AGP, the same factors still apply. If its AGP, and it won't run properly at the 83Mhz FSB setting, my guess would be that your AGP divider was set to 1/1, which would give you an AGP bus speed of 83Mhz, which is also a pretty high over-clock as the AGP bus is only rated for 66Mhz. Try another AGP divider that will get you closer to 66, (say like 2/3) and if no other dividers are available, try lowering your FSB to 75Mhz.

[alpha]

It's because your processor won't run stable at that speed. Cyrixs are not good o/c'ers.

[Target]

Alpha makes a point. It seems that the Cyrix CPU's don't over-clock quite as far, nor quite as easily as the other brands.

I guess I assumed that at 200Mhz, your PC was stable and the only issue you had was with your Video card, and then only when attempting to play games with Open GL.

If that is the case, I still think that the problem lies with the stuff I provided in my previous post.

[CMonster]

Target and Alpha are correct, though in this case I think Target is closer to home; and I might add that heat can be an issue too - be sure to keep that CPU cool.

[This message has been edited by CMonster (edited 01-15-2000).]

[BBA]

I don't know Cmonster.

Any Voodoo2 I have ever seen worked flawlessly at 41 or greater Mhz PCI bus, even with high horse CPU's. Hell, mine even work great at 44Mhz with the CPU at 600.

I would really think hard about the cyrix not being the OC champ.

[alpha]

Yep, VooDoo's can really put the hammer down, if needs be. Sounds like to low a v-core and to much heat.

[Ke01]

If your video is freezing its because your processor isn't giving your video card enough data to process, your telling your system it can send data at 200Mhz when it can't, slow the poor guy down it will work alot better..

Ke01:>

[alpha]

If your cpu wasn't giving enough data to process, then nothing bad would happen. Video cards like the Voodoo3 spend a lot of time sitting around waiting fro the cpu in systems with AMD K6-2 300's and the like.

It's because the system can't handle the heavier load of the games wwhen the cpu is under stress because of the o/c.