memory problem...

  Skulkin 18:28 23 Jul 05


Although there are many previous postings on memory upgrading I cannot find an answer to my specific posting. Apologies in advance if its really obvious.

Belarc tells me that my pc includes:

Main Circuit Board b
1.80 gigahertz Intel Celeron
8 kilobyte primary memory cache
128 kilobyte secondary memory cache
Board: P4X400-8235
Bus Clock: 100 megahertz

Status: Healthy
256 Megabytes Installed Memory

Slot 'A0' has 256 MB
Slot 'A1' is Empty
Slot 'A2' is Empty

1) I wanted to add RAM & was told I needed to use 256MB DDR 266Mhz 184pin pc2100. I bought and have installed this but pc just keeps crashing/restarting.
It works fine again (like now) when I remove it.
I downloaded the Windows Memory Diagnostic tester from microsoft and it says memory is all fine. I notice that Belarc says my bus clock (whatever that is?) is 100Mhz does this mean I've been badly advised and need 100Mhz not 266Mhz memory?

2) to upgrade my memory do I need to use similar capacity memory i.e. 256MB not 512? Could I not add 2 extra 512MB memory sticks?

Cheers peeps

Skulkin :0)

  DieSse 18:49 23 Jul 05

DDR memory runs at twice the speed of the memory bus clock (Double Data Rate).

Your new RAM is thus specified to work with a 133MHz clock. Normally you would expect it to work OK with 100MHz too.

BUT mixing RAM speeds may lead to instabilities too - there's no hard and fast rule on it.

You should be able to mix capacities wihout problems - though it's best practice to put the highest capacity in the lowest numbered slot.

So try changing your RAM over - 512 in A0 - 256 in A1.

Does the system run OK with just the 512 module in the A0 slot.

Somtimes, also, unused slots may be a little dirty - push the RAM in and out a couple of times.

Ideally use only the same brand and speed of RAM together.

  AndySD 18:51 23 Jul 05

Does Belarc give the Make and model of the motherboard?

  Skulkin 20:10 23 Jul 05

Thanks for replies


Both RAMs are 256 was just wondering if I could go larger

Haven't tried just the new 256MB RAM in AO slot, do you think I should?

You said 'Ideally use only the same brand and speed of RAM together'.

I don't know what the original one is. Can I find out?


Does Belarc give the Make and model of the motherboard?

Main Circuit Board
Board: P4X400-8235
Bus Clock: 100 megahertz
BIOS: Phoenix Technologies, LTD 6.00 PG 09/05/2002

1.80 gigahertz Intel Celeron
8 kilobyte primary memory cache
128 kilobyte secondary memory cache

Any help?


Skulkin :0)

  dan11 20:46 23 Jul 05

It's a jetway P4X400 with a here

Crucial say click here

  dan11 21:00 23 Jul 05

This should be your motherboard click here

and the manual says about memory click here

  DieSse 23:08 23 Jul 05

To fnd out full details about your RAM try Everest from click here This should give you makes, speeds, etc.

Whatever your motherboard will actually handle, the main problems are

Compatability between makes and speeds

Compatability when trying to run faster bus speed RAM with a slower bus speed processor.

Often made more difficult with budget motherboards which can be much fussier about RAM.

  woodchip 23:34 23 Jul 05

You need to check you Motherboard Manual for the use of Memory slots as if you have not got them in the right slots it will give problems. You cannot just stick them in any slots and hope they will work unless you have only two slots

  Skulkin 12:24 27 Jul 05

Hello again

I checked using just the 'new' memory stck in slot A0 on its own & it worked fine.

I then put my original stick in slot A1 and it all works fine, showing 512MB (524 actually).

Thanks all for your help

Much appreciated



p.s. If its not too difficult a question for a quick answer, (i)would it be OK for me to remove the 3x256MB sticks and use 3x 512MB sticks and thus get total 1536MB? Could my set up take it?

and (ii)could I put a 512MB in slot A2 added to the two current 256MB sticks for a total 1024MB?

  xania 16:48 27 Jul 05

A quick answer to you last question. Do not have more than 512 Mb for WIndows 98SE or earlier - certanly OK for Windows XP and probably OK for 2000 & Millenium.

If you have 1x 512 Mb and 2x 256 Mb, I would recommend that the 512 Mb goes in slot A0.

  dan11 18:44 27 Jul 05

1) yes, you could have 3 X 512Mb but only do this if you are running windows 2000 or XP.

2) yes. It would be better to put the 512Mb dimm into A0. Then the 256Mb dimms into A1 and A2. re: xania ;-)

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