VOGONS


First post, by jasa1063

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I recently put together a K62- 500 computer with an Asus P5A-B revsion 1.05 motherboard. I am currently running it at 550MHz @2.4v and it is perfectly stable. Trying the 2.0x multipler for 600MHz is a no go. I don't want to go any higher on the voltage. I am using a StarTech Socket 7/370 all copper cooler. I am curious if anyone else has had any luck running a K62-500 @600MHz on any of their systems?

Reply 2 of 11, by cyclone3d

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Not a K6-2 500 but I had a K6-2 550 that ran at 660Mhz back when that was my main system. It was on an ASUS P5A.

The K6-2+ and K6-3+ CPUs generally can overclock to 600+ Mhz

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Reply 3 of 11, by Repo Man11

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jasa1063 wrote on 2020-09-14, 23:34:

I recently put together a K62- 500 computer with an Asus P5A-B revsion 1.05 motherboard. I am currently running it at 550MHz @2.4v and it is perfectly stable. Trying the 2.0x multipler for 600MHz is a no go. I don't want to go any higher on the voltage. I am using a StarTech Socket 7/370 all copper cooler. I am curious if anyone else has had any luck running a K62-500 @600MHz on any of their systems?

It's been many years since I tried overclocking a K6-2, and I never tried too hard because they're very poor overclockers. 50 MHz over the rated speed is actually very good for a K6-2.

Reply 4 of 11, by jasa1063

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I would have loved to have used a K6-2+ or K6-3+, but it is well documented that revisions greater than 1.04 on a P5A-B don't play nice with these CPUs. I recently saw someone had success modding a 1.06 revision board, but I don't if that applies to a 1.05. I already have a couple systems running a K6-3+ CPU, so having a K6-2 in the mix worked out for me anyway.

Reply 5 of 11, by The Serpent Rider

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Regular K6-2 are capable to achieve 600 Mhz. After all the highest binned K6-2 is 550 Mhz. Regular Pentium MMX 2.8v power won't hurt it in any shape (with sufficient cooling).

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Reply 6 of 11, by rmay635703

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Perhaps antidotal but on several boards I had if I benchmarked a Standard k6-2 @ 5.5x theN benchmarked the same chip at a higher speed using the 6x multiplier My results were actually slower at the higher speed
(and no usually in both cases I wasn’t overclocked either same bus speed as well)

Also I had a k6-2 570mhz in my parts bin, don’t remember much about it.

Reply 7 of 11, by swaaye

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I would try to run it at 112 MHz bus and drop the multiplier down to keep the CPU clock around 500. That chip is really bottlenecked by RAM and motherboard cache.

Reply 8 of 11, by jasa1063

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swaaye wrote on 2020-09-15, 17:34:

I would try to run it at 112 MHz bus and drop the multiplier down to keep the CPU clock around 500. That chip is really bottlenecked by RAM and motherboard cache.

I already tried that, but I was using PC100 memory and had stability issues. I will see if I can dig up some PC133 memory and try it agin.

Reply 9 of 11, by jasa1063

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jasa1063 wrote on 2020-09-15, 20:36:
swaaye wrote on 2020-09-15, 17:34:

I would try to run it at 112 MHz bus and drop the multiplier down to keep the CPU clock around 500. That chip is really bottlenecked by RAM and motherboard cache.

I already tried that, but I was using PC100 memory and had stability issues. I will see if I can dig up some PC133 memory and try it agin.

I installed a PC133 256MB DIMM. I tried using lower latency memory settings of 2-2-2 and a few tweaks with TweakBIOS instead of overclocking the FSB and I am satisfied with the result. Just going to leave at that for now.

Reply 10 of 11, by Warlord

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Most k6 will overclock 50 mhz past their bin with no issue. so 450->500 for example. Some K6 will go 100 mhz past bin. Very few k6 will go 150mhz past. And something like 1/10 K6 that have good bins will hit 600mhz. Which is why AMD stop making faster k6s past 550. Because Binning was terrible.