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not reading all RAM

by durp / October 16, 2004 12:00 AM PDT

I have an asus p3b-f board with 4 sticks installed.
0 -pc133 256mb
1 -pc100 128mb
2 -pc100 128mb
3 -pc100 64mb
According to bios it adds up to 448mb?? It only reads the 256 as 128mb.
Is this normal? The specs say it will take a gig of ram.

Thanks

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Re: not reading all RAM
by gunnut666 / October 16, 2004 12:03 AM PDT
In reply to: not reading all RAM

Reread your mobo manual. You may find that although you have 4 dimm slots, only 3 can be used.

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BX Chipsets read most 256 sticks as 128.
by R. Proffitt Forum moderator / October 16, 2004 12:29 AM PDT
In reply to: not reading all RAM

Documented widely. And there is no fix... You must use the doublesided 256 sticks of ram...

Bob

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Re: BX Chipsets read most 256 sticks as 128.
by durp / October 20, 2004 7:48 PM PDT

Okay Bob,
What is doublesided ram ? How do you know if you have it? Is there any negative to keeping what I have in the board now?

Thanks
BOb

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Re: BX Chipsets read most 256 sticks as 128.
by Willy / October 20, 2004 11:55 PM PDT

double sided ram = physical ram chips on both sides of the ram module

No negative impact other than you lose use of one side
of ram available. Sad -----Willy

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Re: BX Chipsets read most 256 sticks as 128.
by durp / October 21, 2004 8:18 PM PDT

The stick is flat on one side the chips are on the other.. but all of the sdram chips I've encountered have this same characteristic.
Bob

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Re: BX Chipsets read most 256 sticks as 128.
by Willy / October 21, 2004 10:11 PM PDT

Check your manual or one supplied by the mtrbd. support website. Verify under the ram mapping, what can be installed. You'll see colums or ram configuartions showing how the ram can be installed. Older systems didn't accept above 256mb per slot or such ram modules were needed to placed in certain slots. As Robert mentioned, BX chipsets had a known problem, but it seems maybe not in your case, do you know if you have BX chipset? On top of all that some fully populated ram slots will cause some conflict as well even though the manual says it can be done. Only after a bios update did a correction allow all ram slots to be used. Plus, you did mix PC133 and PC100 which can cause problems as well, so adding it all up maybe the full combo of possible problem(s) gets resolute in just the one, only 128 of 256 gets recongized, at least it works. Then there's the different vendors ram modules which can be a problem when the system is too picky. Many mtrbd. websites show what vendors have been tested to proved they work well with their products.

gawd, alot of stuff, sorry but it happens...

good luck -----Willy Happy

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No!
by AussiePete / October 21, 2004 2:27 AM PDT
In reply to: not reading all RAM

take all sticks out except for the 256MB stick - then try it in different slots if yout montherboard allows it and see what happens. Is the 256 stick double sided? - sounds as though it maybe stuffed - also try it in a different machine - dont think it would be because it was the wrong type as it just wouldn't read it at all (i think???)- Also clean the contact points ( a soft pencil rubber is good thing to use)
Peter

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Re: No!
by durp / October 21, 2004 8:13 PM PDT
In reply to: No!

Hey Pete,
Tried different slots...no change
cleaned all contacts including mobo
don't know if double sided because I don't know what that is.
Cannot try in another pc ... don't have another one that uses sdram (one with ddr and a laptop).
I have no clue what you mean by "stuffed"
It also turns out upon further investigation that it is pc133 not pc100... the other 3 sticks are pc 100,don't know if that matters.

Thanks
Bob

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