Can I overclock my Cyrix 166+

I have a Jetboard MB (J-656VXB) with Intel VX chipset. 16 megs of 168 pin mem. and 16 of 72 pin(non EDO) 512k PB Cache. It's fast but of course I want faster ;) It is set 2 run 66x2 at 133 mhz. Would it cause over heating or any damege to bring it up to 150 or even 166 mhz? Any help would be appreciated. Mike Lewis

> I have a Jetboard MB (J-656VXB) with Intel VX chipset. 16 megs of 168 pin > mem. > and 16 of 72 pin(non EDO) 512k PB Cache. It's fast but of course I want > faster ;) It is set 2 run 66x2 at 133 mhz. Would it cause over heating > or any damege to bring it up to 150 > or even 166 mhz? A week ago I set my p166+ to 75*2 Mhz (motherboard Asus T2P4), until now no problems! But to be on the save side, I bought a better cooling device. Bernd

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> I have a Jetboard MB (J-656VXB) with Intel VX chipset. 16 megs of 168 pin > mem. > and 16 of 72 pin(non EDO) 512k PB Cache. It's fast but of course I want > faster ;) It is set 2 run 66x2 at 133 mhz. Would it cause over heating > or any damege to bring it up to 150 > or even 166 mhz? > Any help would be appreciated. > Mike Lewis

It is NOT recommended but, that doesn't stop people from trying. Check out : http://sysdoc.pair.com/overclock.html#Overclocking Step by Step for a complete reference. BTW: How did you do the impossible and get 16 megs of SDRAM and 16 megs of FPM to run at the same time? Jim Fitzgerald xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

Just because it has 168 pins doesn't necessarily mean it's SDRAM. You can get EDO DIMMs as well. -- The IWCCCARS Project: Q & A Representative http://www.theuspits.com/iwcccars/index.html http://userwww.service.emory.edu/~ebusch/

Yes it wil run hotter, but how much hotter is anyone's guess. Do yourself a favor and get a decent heatsink/fan combo to sit atop the CPU ang go for it. Assuming you can keep a chip cool enough, it's theoredically possible to run it at any speed. -- The IWCCCARS Project: Q & A Representative http://www.theuspits.com/iwcccars/index.html http://userwww.service.emory.edu/~ebusch/

I'm probably dead wrong but I remember hearing that 66mhz x 2 is better than 60mhz x 3. Can anyone confirm or deny this? thanx

>I have a Jetboard MB (J-656VXB) with Intel VX chipset. 16 megs of 168 pin >mem. >and 16 of 72 pin(non EDO) 512k PB Cache. It's fast but of course I want >faster ;) It is set 2 run 66x2 at 133 mhz. Would it cause over heating >or any damege to bring it up to 150 >or even 166 mhz? Don't run it at 2.5x60 or even 3x50 to achieve 150 MHz, that's actually slower than your current setup (at least if you want to play games). The way to go is to increase the clock of the board to 75 or 83 MHz. Be careful, though: Cyrix chips get much hotter under normal conditions than Intel chips. The author of a very comprehensive site on overclocking claims that the Cyrix are already "overclocked" by the manufacturer, i.e. there is less unused potential than in an Intel chip. You may find all this info under: http://sysdoc.pair.com/busspeed.html http://sysdoc.pair.com/75mhzbus.html http://sysdoc.pair.com/overclock.html If your board can be set to higher speeds, that might be the way to go. Good luck!

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> Deleted.... Assuming you can keep a chip cool enough, it's > theoredically possible to run it at any speed. > -- > The IWCCCARS Project: Q & A Representative > http://www.theuspits.com/iwcccars/index.html > http://userwww.service.emory.edu/~ebusch/

Um, Eric, I don't think so. The logic in the chip is designed to run at a certain speed and that will be the limit. For instance, at work, we run our logic designs, and then route them at a certain speed. The routing of the chip will ensure that all the connects are the proper length (ie time delay) that the chip will run. I would imagine the Intel and competitor chips are all routed at pretty high speeds to make the upgrades easier. But I'm also quite sure that the logic would fall apart (called a race condition) due to routing at some speed. What that value is, I have no clue. Does this make sense?? Later.

Perhaps, but in PC Direct France's January edition there is an interview with Jean-Paul Colin (Intel research director, France) about overclocking. The following is part of that interview: PC Direct: What are the risks for the customer? Jean-Paul Colin: When the CPU processing speed is increased, temperature raises too. Now, each time temperature raises 6.5C, you double the risk of malfunctions. All our CPUs are certified to work in a range of -25C to +80C. And the tests are run by Intel in extreme conditions of temperature and voltage. PC Direct: So, it's totally possible for a Pentium to work perfectly at _any_ speed, if it's correctly cooled? Jean-Paul Colin: That's right. -- The IWCCCARS Project: Q & A Representative http://www.theuspits.com/iwcccars/index.html http://userwww.service.emory.edu/~ebusch/ sense??

I guess I should clarify things because this is all a moot point anyway. Severe overclocking is not practical, as it's just not possible to keep the CPU cool enough. You'll run into thermal failure well before you reach the limits of the chip's circuitry. -- The IWCCCARS Project: Q & A Representative http://www.theuspits.com/iwcccars/index.html http://userwww.service.emory.edu/~ebusch/