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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

7416.0. "MMX upgrades?" by SNOFS1::16.153.96.192::powellronald (Australia!) Thu Apr 17 1997 21:18

Can any one tell me if the Pentium MMX chips have different voltage 
requirements than a Pentium of the same clock speed? IE, is an MMX 
chip a straight "drop in" upgrade for a pentium machine? ( I know you 
need the i440FX chip set for the MMX ).

 Ron Powell.

T.R	Title	User	Personal Name	Date	Lines
7416.1		JGO::GERRITSEN	[email protected]	`Fri Apr 18 1997 08:08`	10
	MMX uses 2.8 Volt and the "normal" Pentium requires 3.3 Volt. So you can't swap them but have to adjust the voltage. Don't know how that is done by DEC modules but ASUS has jumpers to change the voltage setting. Ray
7416.2	Do I need a new VRM?	SNOFS1::16.153.96.192::powellronald	Australia!	`Sun Apr 20 1997 19:31`	7
	Does this mean the Venturis FX requires a different voltage regulator module to run the MMX cpu? The machine we wish to try out is currently running a 166 Pentium. (Venturis' running CPU's faster than 133Mhz use VRMs) Thanx, Ron .
7416.3	Use the Overdrive version!	JULIET::HARRIS_MA	Networks Sales Exec	`Mon Apr 21 1997 14:08`	5
	MMX-Overdrive chips have the built-in 2.8v voltage regulator with the same Pentium-MMX guts otherwise. 166MMX-Overdrive is $289 right now thru Intel-reseller (DEC) employee purchase plan. Mark
7416.4	Different regulators required for Venturis FX and FX-2	RINGSS::WALES	David from Down-Under	`Mon Apr 21 1997 18:38`	6
	G'Day, Yes, the regulators do need to be different if you are using the non-overdrive version of the MMX CPUs. David.
7416.5	Part Number for 2.8V (MMX) Regulator for Venturis FX / FX-2 Series	NNTPD::"[email protected]"	Frank Melady	`Fri May 09 1997 07:25`	19
	I have just checked a new Venturis FX-2 166Mhz MMX Machine that has been delivered to our Call Center. The part number on the Regulator is 54-25300-01 So if you get anyone trying to upgrade their FX/FX-2 Series machine to an ordinary MMX Processor (Not the MMX Overdrive) They will need this new regulator. ___________________________________________________________ Frank Melady - UK/Ireland - Field Engineer Support Desk email: [email protected] Telephone uk: 01256-373370 eire: 01-8385433 Ext. 2768 dtn: 827 - 2768 See Us at Intranet Site: http://harpo.dbo.dec.com/telesupport/ _______________________________________________________________ [Posted by WWW Notes gateway]