*Confused* 256MB Stick working on a BX chipset board?

[Mildlyamused]

I've got a stick of crucial PC100 memory 256MB unbuffered memory that happens to work on boards that have 168PIN SDRAM. Now normally the Intel 440LX/BX chipset supports 128MB DIMMS and I've confirmed this with some Corsair 256MB PC133 memory. But when I stick in the 256MB Crucial stick, it works perfectly fine and is detected properly. Now I'm wondering, why is it that this crucial stick works and the corsair module doesn't?

 

[imported_Kensai]

It should downclock to the slower speed, but it might not work in a system that only supports low density memory.

 

[Green Man]

BX doesn't work with high density chips. It'll work with 256MB stick as long as it's not high density.

 

[Mildlyamused]

Incase you guys are wondering, here are the model numbers:
CT32M64S4D8E 256MB, 168-pin DIMM (Crucial Module)
VS256MB133A (Corsair Module)

Is there a specific reason why the Crucial module works? If other modules like the crucial one works, which one? How do I know what to look for in modules to make sure it works?

 

[Mildlyamused]

How can one identify something as "high density"?

 

[dodgybob]

High density will be single sided for a 256mb stick. Lower density chips force them to use both sides of the pcb. I had that problem when upgrading ram on an old machine and had to return it in the end.

 

[imported_Kensai]

Ah, your chipset will only support double-sided DIMMs.