My question is: have anybody tried to overclock a 600E? Mine has P2-366 and of course 66fsb. I have overclocked many T4x-laptops by fiddling PLL-chip and got 100 -> 133fsb. In 600E it would be 66 -> 100fsb and CPU speed from 366 to 500. I think that would be manageable. Not interested in P3's because of the cache-error.
There may be a method of overclocking a 600E that employs a hardware mod to replace the clock generator. Never tried this myself, and can't comment on whether it might work in a 600E.
Here's a post in The official 700 Upgrade thread where el-sahef posted about it back in 2009:
Post #96 in 133 Mhz FSB on Thinkpad 770X, 770Z and 600E (NOT 600X!)
Nostalgic for: 600X PIII 850MHz in a SelectaDock III with 64MB Voodoo 5 5500 and Sound Blaster Audigy 5.1.
I don't think it needs a new PLL... Because if P3's do work with 100fsb with little mod so I'm quite sure P2's will too. Remember overclocking Slot1-processors with piece of tape to isolate BSEL-pin from processor socket. So, I think I'll just have to find the BSEL-pin and find out what to do with it. If it gets too complicated I'll give up and be happy just like it is now. 366MHz should be enough for everyone.
That clock speed is way too high for a Mobile Pentium 2. Even if it does manage to reach that clock speed, I would not expect any sort of stability from that. Additionally, the low voltage of 1.6V would be a massive roadblock for this experiment, since most Pentium 2 Deschutes processors that managed to hit above 500MHz or even 550MHz+ needed more than just 2V. Now, if you factor in the L2 cache of Deschutes that runs at only half of its actual speed, that makes it ever more unlikely that Dixon would ever hit 500MHz+.
In conclusion: Dixon had its L2 cache running at its actual speed, which would heavily pull down your chances of reaching 550MHz with a 100MHz front-side bus. That, added with the very low stock voltage of 1.6V, would not get you anywhere but maybe 400MHz or so.
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