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- Path: sparky!uunet!caen!sdd.hp.com!col.hp.com!hplsdrn
- From: bae@hplsdrn.col.hp.com (Bruce Erickson)
- Newsgroups: comp.os.msdos.misc
- Subject: Re: Run 33MHz CPU at 40/50MHz?
- Date: 07 Jan 1993 15:47:26 MST
- Organization: Hewlett-Packard Logic Systems Operation
- Lines: 27
- Sender: bnr@hplsdrn.col.hp.com
- Message-ID: <1iic51INNm2i@hp-col.col.hp.com>
- References: <1993Jan6.162636.9927@ac.dal.ca>
- NNTP-Posting-Host: hplsdrn.col.hp.com
-
- In comp.os.msdos.misc (subj: Run 33MHz CPU at 40/50MHz?), francis@ac.dal.ca writes:
- > I have a 486DX/33MHz system, and I have been told by the manufacturer that
- > the motherboard is upgradeable to 50MHz by plugging in a new crystal and CPU.
- >
- > Question: Is it possible to plug in (say) a 40MHz or even a 50MHz crystal
- > into the board *without* replacing the old (33MHz) CPU?
- > If so, is there a performance improvement or will the 486DX 33MHz chip just
- > burn itself out, ie, has it been internally hardwired for the specified clock
- > frequency of 33MHz? I would like to hear from anyone who has attempted this
- > (with/without success).
-
- Most likely results:
- Flakey processor. A 33MHz-rated chip is designed to run at 33MHz
- under worst-case conditions. So, if you run it faster:
- - it may or may not work, even under 'optimum' conditions
- - it almost certainly will not work as the chip heats up.
- Luckily, I believe the innards of the chip are CMOS, so if the chip
- overheats it won't start thermal run-away and "catch fire". However
- running the chip too hot will probably destroy it over time as
- metal migration and other nastys occur.
-
- Suggestion: Don't do this. Even if it seems to work for a while, you
- may be corrupting memory and your disk!
-
- - Bruce Erickson
- Hewlett Packard
- bae@col.hp.com
-