Max Voltage when overclocking PIII700 cBo?

[Schmo]

Title says it all.

 

[dadx2mj]

In my opinion raising core voltage is where over clocking gets dangerous. Only raise it if absolutly nessesary and then only enough to gain stability. The closer to default you are the better. I have a P3 600 cBo stepping running at 841 Mhz at default 1.65 volatage

 

[Schmo]

But realistically, to get the speed that you want out of a processor you typically go up to 1.8 or so.

I was running a PIII700 overclocked at 1.85v for a long time. I have seen people go to 1.9 or even 1.95 but consider that over the edge.. isn't it?

 

[BradS]

There are many people that don't have to bump the voltage to overclock. I think you will see that most people sell overclocked P3 cpu's quoting 1.85-1.9 max. Cooling a high megahertz cpu at 1.9 or higher can be a problem.

 

[Spoooon]

For me, 1.85 is max. However, there is point where you start to get diminishing returns. For me to run stable at 1001, I need 1.85 volts. However, I can run stable at 959 at 1.75 volts. Is it really worth jacking up the voltage by that much for 42 mhz? 1.65 to 1.75 gets me 259mhz. 1.75 to 1.85 only gets me 42. Other than the coolness faster(seeing the post screen at 1000mhz), it's not worth it for me.

 

[Killer Ape]

I tend to agree with Spooon. You reach a point of diminishing returns pretty quick. My C533A does 825 @ 1.65v and 897 @ 1.85. I run it at 825 because I don't see any real world performance gain from 825 to 897 and it's MUCH hotter at 1.85v than at 1.65v. So a trade-off of a 150% OC vs. a 168% oc is worth it for the added peace of mind.

I used to run it at 897 in the Fall/Winter when the ambient temperature was cooler and then drop to 825 in Spring/Summer, but that just started to seem silly.

The rule of thumb I use when OCing is don't exceed the Intel rated voltage for the speed of the STOCK proc you are trying to "match", i.e. if a non-OCed P!!!933 runs at 1.8-1.85v (or whatever), then if you are OCing a 700E to 933 don't exceed 1.85v. I'd allow a +0.5v fudge if it got you stable though. It really also depends on how good your cooling is, what your life expectancy for the chip is, etc. etc. Most people don't go above 1.9v with CuMines without EXCEPTIONAL cooling, if at all.

 

[Def]

P3s can take 1.9-1.95 easily. Will probably last MANY years at this voltage(as long as cooling is decent). Intel's max spec is 2.0V for the P3 core, but people have been known to run for a long time(over a year) with their CuMine core at 2.05V. Its not like you suddenly get up close to 2V and your chip fries.

Celerons are a different story. They can run at a lower default voltage because they have half the L2 cache of the CuMine. Basically the voltage is only having to power 70-80% of a CuMine chip, so it usually doesn't need as much, and can't handle as much. I'd be wary running a Celeron at 1.90 or above.

BTW, I've been running my 933EB at 1064Mhz at 1.90V for the past 6 months. No problems here. Asus CUSL2 MoBo and Alpha PAL35T BTW.