As the subject said, I have pulled two 128MB DIMMs from a VIA PLE133
based mobo. The modules were installed into an Epox EP-51MVP3E-M mobo
which is VIA MVP3 based.

The memory modules worked fine EXCEPT:

I do not see the other half of the 256MB I had expected.

Questions:

1. What is the difference between the two types of DIMMs compatible
with each mobo?

2. Is there a hardware hack to enable the other half? I presume here
that an MSB address line is missing.

Appreciate any pointers to documentation online or otherwise.

Thanks

On 10 Jan 2006 11:57:24 -0800, "rc0" <(E-Mail Removed)> wrote:

>As the subject said, I have pulled two 128MB DIMMs from a VIA PLE133
>based mobo. The modules were installed into an Epox EP-51MVP3E-M mobo
>which is VIA MVP3 based.
>
>The memory modules worked fine EXCEPT:
>
>I do not see the other half of the 256MB I had expected.
>
>Questions:
>
>1. What is the difference between the two types of DIMMs compatible
>with each mobo?
>
>2. Is there a hardware hack to enable the other half? I presume here
>that an MSB address line is missing.
>
>Appreciate any pointers to documentation online or otherwise.

You're pretty much hitting the nail on the head with your guess above,
the VIA MVP3 chipset only supports 64Mbit chips at a maximum. You're
DIMMs likely use 128Mbit chips and just aren't supported by the
chipset. Each 128MB DIMM therefore gets detected instead as a 64MB
DIMM and you end up with only half your memory.

There is no solution to this.

-------------
Tony Hill
hilla <underscore> 20 <at> yahoo <dot> ca