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- Newsgroups: comp.sys.ibm.pc.hardware
- Path: sparky!uunet!zaphod.mps.ohio-state.edu!cs.utexas.edu!csc.ti.com!tilde.csc.ti.com!mksol!mccall
- From: mccall@mksol.dseg.ti.com (fred j mccall 575-3539)
- Subject: Re: What's the deal? My chip says "SX-25"; Norton says "SX-33"
- Message-ID: <1992Dec29.212822.15196@mksol.dseg.ti.com>
- Organization: Texas Instruments Inc
- References: <1grur8INNkg2@savoy.cc.williams.edu> <5870140@pollux.svale.hp.com>
- Date: Tue, 29 Dec 1992 21:28:22 GMT
- Lines: 30
-
- In <5870140@pollux.svale.hp.com> dlow@pollux.svale.hp.com (Danny Low) writes:
-
- >>Some people asserted that it would kill my chip
- >>soon while others claimed that Intel makes ALL its chips for 33Mhz,
- >>and only tests the ones at 33Mhz if it plans to sell them at 33Mhz.
- >>The rest are tested at lower clock rates. This would imply that if the
- >>chip works at 33Mhz, then it is just as good as 33Mhz.
-
- >This is not quite right. Intel tests ALL chips at 33MHz and those
- >that pass are marked 33Mhz. Those that FAIL are re-tested at
- >25MHz and if they then pass, are marked 25MHz. So your 25MHz
- >chip is marked as such because it failed at least one of the tests
- >Intel uses at 33MHz. I would not be all that confident of the
- >reliability of the chip. The dealer is betting that you will not
- >encounter the failure that made the chip a 25MHz one instead of
- >a 33MHz one.
-
- Well, that's not quite right, either. What I suspect happens (I'm not
- in the semiconductor biz) is that Intel tests all its parts at 33 MHz
- UNTIL THEY HAVE THE NUMBER OF 33 MHZ PARTS THEY WANT TO SHIP. Then,
- all the failures PLUS UNTESTED CHIPS are tested at lower speeds.
-
- Note that this doesn't necessarily apply to all parts (i486-50DX parts
- use a different fab process than 33DX parts).
-
- --
- "Insisting on perfect safety is for people who don't have the balls to live
- in the real world." -- Mary Shafer, NASA Ames Dryden
- ------------------------------------------------------------------------------
- Fred.McCall@dseg.ti.com - I don't speak for others and they don't speak for me.
-