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Memory for Pentium 4 - 2.8ghz - 533Mhz FSB

Posted on 2004-10-12
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Last Modified: 2010-04-25
Hi,

I have a white box computer with a Pentium 4 procesor, 2.8Ghz an has 533Mhz FSB.
My motherboard has 4 memory slots and I have occupied only 2 of them. I want to put more memory on it, however, I'm not sure exactly what is the memory speed I should buy.
Any hint ?

Thanks in advance.
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Question by:fischermx
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by:_
ID: 12294720
Download and run this program. It will tell you all you want to know about your system.

everst home : formerly know as aida32 , checks to see what you have in your computer
also can find out cpu and motherboard temps
http://www.lavalys.com/index.php?page=product&view=1&subpage=5

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by:Wakeup
ID: 12295721
Or if you know what motherboard you own, we might be able to help you there or any more information you have on the machine.  Also most computer stores will be willing to look at one of your sticks of ram to match it up.  

If your motherboard is a recent board....probably built within the last year or less, it should be DDR 400.
or PC 3200.

But if your board is older, it may be Rambus or RDRam.
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by:Callandor
ID: 12297197
I think Rambus memory is reserved for high-end motherboards, being so expensive, so it is likely you have DDR.  A 533FSB uses DDR266 (or PC2100), but perhaps the motherboard allows for an 800FSB, in which case DDR400 (PC3200) would let you install an 800FSB P4 in the future.  See what Everest says, to be sure.
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by:fischermx
ID: 12298421
Callandor :

That's my main doubt actually. My motheboard (Biostart with Intel 865PE) says it supports 266/333 and Fuzzy400, what on earth is Fuzzy 400 ?

Also it says that with a FSB of 533 I should use ONLY 266/333. And with FSB 800 I should use ONLY 400. Yes, with underline "only".
I mean, why you suggest like if the speed where optional ? :)

Regards,

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Callandor earned 125 total points
ID: 12298696
I have never heard of "Fuzzy 400" either.  What is the exact model motherboard?  Maybe the documentation will reveal what this is all about, but DDR400 should not have a problem running slower, though you should not mix different speed RAM (I have encountered a problem when I did that).  It could be that they were being cautious and DDR400 was new when this board was introduced.
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by:Wakeup
Wakeup earned 125 total points
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That's interesting, I sell 865 chipset boards with 533 FSB Cpu's, and we usually use ddr400.  seems (in my opinion) to work just fine.
been selling 865 boards for a year now....

But if the manual states 533 should use 266/333, then maybe that is what you should do.

And for 800 FSB, you need 400 for sure.  On some boards using the slower ram it works, but just hinders the system.  Performance is very weak and is just better to run 400 if you can get it.


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by:Wakeup
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by:crazijoe
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If your MB is running Dual Channel mode I would suggest getting the same specs as what is presently in your system now(i.e. speed, latancy). Running one channel at one specs and running the second channel at different specs does not work.
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by:Sam Cohen
ID: 12302724
what does the inscription on the memory say?
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by:_
ID: 12305049
Seems like Wakeup and Callandor (the BORG) got it covered.   : )
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