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Old 12-18-2003, 05:20 PM   #1 (permalink)
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Is PC-100 SDRAM compatible with PC-133 SDRAM?

Hi

Is PC-100 SDRAM compatible with PC-133 SDRAM? Does it make the system unstable???

thanks.

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Old 12-18-2003, 05:25 PM   #2 (permalink)
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no unless you have a picky mobo but i wouldnt recomend it as the pc133 will then run at pc100 speed
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Old 12-18-2003, 05:28 PM   #3 (permalink)
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ok... but it would be better than nothing wouldn't it??? just for now anyway... till i can get some more ram.
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Old 12-18-2003, 05:31 PM   #4 (permalink)
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if you mixed pc100 to pc133, you will most likely to set your mobo to 100Mhz too.. your system speed will depend on the slowest module which is your pc100 memory. and if your mobo is sensitive, problems will arise if you use both like what Headband said.
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Old 12-18-2003, 05:43 PM   #5 (permalink)
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ok, thanks i think i will just stick the one type of ram in.
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Old 12-18-2003, 06:33 PM   #6 (permalink)
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No, the system won't slow down to 100MHz, if the PC-100 RAM can't handle the 133MHz FSB, it will run unstable. You kinda get lucky using PC-100 on a 133MHz FSB. Try it, if it doesn't work, try "underclocking" until you get faster RAM.
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Old 12-18-2003, 06:39 PM   #7 (permalink)
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Maybe the first question wasnt too clear.

You want to take pc100 and run it in a pc133 system?

It may work and it may not....essentially it would be "overclocked".

It wont hurt anything to try it though...if anything it may just not boot.

What you can do is look in the bios cuz some boards from then had a choice of RAM speeds....sometimes they would have the ram set as either "cpu clock+ 33mhz" or "cpu clock" or "cpu clock-33mhz"

or it may say "fsb+33mhz" or whatver.

If you have a choice like that you want "-33mhz"...so your cpu would be running at 133mhz fsb but your ram would be at 100fsb.


Do you know what exact model motherboard you have?

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Old 12-22-2003, 04:26 AM   #8 (permalink)
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yeah JP as for this mobo i again have no documentation... but according to system startup i get these numbers:
03/15/2002-694X-686B-6A6LJA1PC-8G.
the brand of the board i think is Abit.
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Old 12-23-2003, 01:21 AM   #9 (permalink)
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ok... i tried using the pc100 with the pc133 but it made the system really unstable... so i'm just gonna have to get some more ram. thanks for the help everyone
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Old 12-23-2003, 01:46 AM   #10 (permalink)
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i think he was asking if you can mix pc100 and pc133

and if that is the question refer back to what HeadBand and Dax_Brandy said .
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