Can I mix 30 pin and 72 pin SIMMs?

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3 total messages Started by Rajesh K. Singh Mon, 09 Sep 1996 00:00

#225

Author: Rajesh K. Singh
Date: Mon, 09 Sep 1996 00:00

22 lines
1944 bytes

About 2 years ago I purchased a 486DX2 66 MHz system (8MB RAM, 400 MB hard
disk, etc.) from Midwest Micro for home use. By now, the disk has very
little room left and I could use additional memory as well. So I opened up
the case, saw that there is extra cable and power supply for another hard
disk. 

However, I was surprised to find ONLY TWO 72 pin slots for SIMMs. Both the
slots have 4MB boards.  How can I upgrade from 8MB to 16MB, without, in
effect, wasting my current two SIMMs? Should my PC's mother board have
come with 4 slots? 

Right next to the 72 pin slots, there are 4 more 30 pin slots. Can I fill
2 of these slots with 4MB modules? In other words, can I use 30 pin and 72
pin memory at the same time? 

Thanks a lot.  --raj (raj@goliath.Stanford.EDU)
-- 
--
Rajesh Kumar Singh                   E-mail: raj@goliath.stanford.edu
Gauls!  We have nothing to fear; except perhaps that the sky may fall
on our heads tomorrow.  But as we all know, tomorrow never comes!!

Re: Can I mix 30 pin and 72 pin SIMMs?

#226

Author: Jay K.
Date: Wed, 11 Sep 1996 00:00

34 lines
2378 bytes

On 9 Sep 1996 20:57:44 GMT, raj@goliath.Stanford.EDU (Rajesh K. Singh)
wrote:

>About 2 years ago I purchased a 486DX2 66 MHz system (8MB RAM, 400 MB hard
>disk, etc.) from Midwest Micro for home use. By now, the disk has very
>little room left and I could use additional memory as well. So I opened up
>the case, saw that there is extra cable and power supply for another hard
>disk. 
>
>However, I was surprised to find ONLY TWO 72 pin slots for SIMMs. Both the
>slots have 4MB boards.  How can I upgrade from 8MB to 16MB, without, in
>effect, wasting my current two SIMMs? Should my PC's mother board have
>come with 4 slots? 
>
>Right next to the 72 pin slots, there are 4 more 30 pin slots. Can I fill
>2 of these slots with 4MB modules? In other words, can I use 30 pin and 72
>pin memory at the same time? 
>
>Thanks a lot.  --raj (raj@goliath.Stanford.EDU)
>-- 
>--
>Rajesh Kumar Singh                   E-mail: raj@goliath.stanford.edu
>Gauls!  We have nothing to fear; except perhaps that the sky may fall
>on our heads tomorrow.  But as we all know, tomorrow never comes!!

Yes, you can mix 30-pin SIMMS and 72-pin SIMMS in a 486. Just be sure
to fill ALL FOUR slots in the 30-pin bank with the exact same modules.

Therin lies the rub. If you add 4-4MB SIMMS, you will end up with 24MB
of RAM. Each module will run about $30-35 ea. If you trash (or sell)
your 72-pin 4MB SIMMS, you should be able to buy 2-2X32 SIMMS (16MB)
for about $90.
J.

Re: Can I mix 30 pin and 72 pin SIMMs?

#223

Author: Robert Megee
Date: Thu, 19 Sep 1996 00:00

14 lines
1667 bytes

Better check the manual.  I have a true green 486 mother board with 2-72 pin
slots and 4-30 pin slots.  I can put in one 72 pin simm, one 72 pin and two
or four 30 pin simms, or I can put in two 72 pin simms with no 30 pin simms.
the motherboard uses some strange bank switching.  Fine for having a single
72 pin simm, though.

rbrt

--
====================================================================
Breathe in and breathe out,      |          Robert Megee
the rest is just fluff...        |          megee@exwin.dseg.ti.com
====================================================================

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