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Conference giadev::decstation

Title:	DECstation PC Conference
Notice:	register note 2, see notes 3 & 4
Moderator:	TARKIN::LININD

Created:	Tue Jan 10 1989
Last Modified:	Fri Jun 06 1997
Last Successful Update:	Fri Jun 06 1997
Number of topics:	7470
Total number of notes:	34994

7387.0. "Amd 5x86 CPU in LPx+" by VAXRIO::CUPOLILLO () Mon Mar 17 1997 12:56

    
        Hi,
    
        One of our customers decided to upgrade their old DECpc LPx+, so
    they bought, from a third-party, a bunch of Amd 5x86-133 CPUs and re-
    gulators boards.  At a first look every thing seens to work well, but
    the machines are not able to boot from floppy.
    
        I presume that the problem is releated to the internal CACHE of the
    CPU, as if we disable the internal CACHE the machines work ok.  None of
    the systems have secondary level CACHEs.
    
        Does this kind of upgrade worth any thing?  Is it really supported
    by the LPXx+ machines?    
    
        Thanks,
    
        Cupol

T.R	Title	User	Personal Name	Date	Lines
7387.1		QUARK::LIONEL	Free advice is worth every cent	`Mon Mar 17 1997 13:07`	4
	I've seen this general problem reported a lot, and it's not just Digital's PCs. Some PCs it works on, some it doesn't. No, it's not "supported". Steve
7387.2		TARKIN::LIN	Bill Lin	`Mon Mar 17 1997 14:09`	10
	re: VAXRIO::CUPOLILLO I'll second the fact that these cpu upgrades are NOT SUPPORTED. I'm probably going to look into these for my own home machine. I've heard that the upgrades are not all created equal, even if they use the same chip. Some are more easily configured than others. I think it is a roll of the dice if the upgrades work in any given machine. /Bill
7387.3		BSS::PROCTOR_R	Sniffing the floral arrangement	`Mon Mar 17 1997 15:56`	7
	re: .- few I (unfortunately think that you gets your choice of Intel or Intel to upgrade... check www.intel.com to see if the machine has been "approved" by Intel for upgrading. .bob (who has been down this road, and still bears the scars) p.
7387.4	Try Evergreen	CARLSN::GASSERT		`Sun Mar 23 1997 20:38`	5
	I have a customer who has used the upgrade from Evergreen that uses this chip. he has used it on many brand pc including Digital and says it has always worked. kevin
7387.5	Trail-and-error...	JULIET::HARRIS_MA	Networks Sales Exec	`Fri Mar 28 1997 12:55`	8
	Some of these upgrades have NO JUMPERS, and some have 2 or 3 jumpers. They usually are all cache related (write-back vs. write thru, enable and disable, and size) They are definitely trial-and-error upgrades. Some will work, some won't. Mark