440BX and 512MB DIMMs used at half capacity. Safe?

Discussion about old PC hardware.

440BX and 512MB DIMMs used at half capacity. Safe?

Postby darry » 2017-11-16 @ 03:30

I currently can only find one single working dual sided 256MB PC100/PC133 DIMM in my hoard to put into my recently acquired P3B-F .

How safe and reliable would using 3 or 4 512MB PC133 DIMMs each detected at half their rated capacity be on such a 440BX board ?

So far the board seems to detect 1GB out of 1.75GB physically installed and does not seem to have issues under XP (have not run memtest yet).
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Re: 440BX and 512MB DIMMs used at half capacity. Safe?

Postby Vallenrod » 2017-11-16 @ 04:41

Only way to find out is to run memtest and/or prime95 or similar stress test.
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Re: 440BX and 512MB DIMMs used at half capacity. Safe?

Postby Koltoroc » 2017-11-16 @ 10:32

In my experience it should not cause any trouble. Stress test would not be a bad idea though.
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Re: 440BX and 512MB DIMMs used at half capacity. Safe?

Postby BreakPoint » 2017-11-16 @ 12:30

Guess it's memory chips density issue. Your chipset simply can not see all memory cells.
it's 100% safe for memory and board.
Can you write what engraved on your memory chips.
Last edited by BreakPoint on 2017-11-16 @ 14:03, edited 1 time in total.
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Re: 440BX and 512MB DIMMs used at half capacity. Safe?

Postby konc » 2017-11-16 @ 13:04

BreakPoint wrote:Guess it's memory chips density issue. You chipset simply can not see all memory cells.
it's 100% safe for memory and board.
Can you write what engraved on you memory chips.


This, 100% safe. Don't worry about it.
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Re: 440BX and 512MB DIMMs used at half capacity. Safe?

Postby darry » 2017-11-17 @ 02:24

Thank you everyone for your answers . This is very reassuring .
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Re: 440BX and 512MB DIMMs used at half capacity. Safe?

Postby darry » 2017-11-26 @ 03:08

I have managed to acquire some 256MB DIMMs anyway, because the board does not POST at 133MHz FSB with the 512MB PC133 DIMMs . If I put in 4 x 256MB PC133, it works fine at 133MHz FSB but refuses to detect more than 768MB . At 100MHz, it detects all 1024MB .

Any suggestions ?
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Re: 440BX and 512MB DIMMs used at half capacity. Safe?

Postby Koltoroc » 2017-11-26 @ 15:22

darry wrote:I have managed to acquire some 256MB DIMMs anyway, because the board does not POST at 133MHz FSB with the 512MB PC133 DIMMs . If I put in 4 x 256MB PC133, it works fine at 133MHz FSB but refuses to detect more than 768MB . At 100MHz, it detects all 1024MB .

Any suggestions ?

run them at 100Mhz or settle for 768. With older boards and even some new ones it is actually quite common that fully populating all DIMM slots precludes using the highest memory speeds. most likely there is nothing you can do about it.
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