All memory isn't showing up....

[mooseracing]

I am using a Tyan S2877 server board, there is support for over 4gb. I'm only running 2 single gb sticks and 2 512 sticks. There is 4 slots for cpu 0 and 2 slots for cpu 1. I have it installed like dual channel. 1.5 GBs for each cpu.

The BIOS and Vista show 2GBs.

while cpu-z log shows.....

Memory SPD
------------------------------------------------------------------------------

DIMM #1

General
Memory type DDR
Manufacturer (ID) Samsung (CE00000000000000)
Size 1024 MBytes
Max bandwidth PC3200 (200 MHz)
Part number M3 12L2920CZ3-CCC
Serial number 7416CBB8
Manufacturing date Week 39/Year 06

Attributes
Number of banks 1
Data width 72 bits
Correction ECC
Registered yes
Buffered no
Nominal Voltage 2.50 Volts
EPP no
XMP no

Timings table
Frequency (MHz) 133 166 200
CAS# 2.5 3.0
RAS# to CAS# delay 3 3
RAS# Precharge 3 3
TRAS 7 8


DIMM #2

General
Memory type DDR
Manufacturer (ID) Micron Technology (2CFFFFFFFFFFFFFF)
Size 512 MBytes
Max bandwidth PC3200 (200 MHz)
Part number 18VDDF6472Y-40BG3
Serial number D212EB77
Manufacturing date Week 66/Year 06

Attributes
Number of banks 1
Data width 72 bits
Correction ECC
Registered yes
Buffered no
Nominal Voltage 2.50 Volts
EPP no
XMP no

Timings table
Frequency (MHz) 133 166 200
CAS# 2.0 2.5 3.0
RAS# to CAS# delay 2 3 3
RAS# Precharge 2 3 3
TRAS 6 7 8


DIMM #3

General
Memory type DDR
Manufacturer (ID) Samsung (CE00000000000000)
Size 1024 MBytes
Max bandwidth PC3200 (200 MHz)
Part number M3 12L2920CZ3-CCC
Serial number 7416DDEB
Manufacturing date Week 39/Year 06

Attributes
Number of banks 1
Data width 72 bits
Correction ECC
Registered yes
Buffered no
Nominal Voltage 2.50 Volts
EPP no
XMP no

Timings table
Frequency (MHz) 133 166 200
CAS# 2.5 3.0
RAS# to CAS# delay 3 3
RAS# Precharge 3 3
TRAS 7 8


DIMM #4

General
Memory type DDR
Manufacturer (ID) Micron Technology (2CFFFFFFFFFFFFFF)
Size 512 MBytes
Max bandwidth PC3200 (200 MHz)
Part number 18VDDF6472Y-40BG3
Serial number DA014944
Manufacturing date Week 64/Year 06

Attributes
Number of banks 1
Data width 72 bits
Correction ECC
Registered yes
Buffered no
Nominal Voltage 2.50 Volts
EPP no
XMP no

Timings table
Frequency (MHz) 133 166 200
CAS# 2.0 2.5 3.0
RAS# to CAS# delay 2 3 3
RAS# Precharge 2 3 3
TRAS 6 7 8

any ideas?

 

[n7]

I don't know what it'll be called on that kinda motherboard, but for mine, in the bios, it's called "Enable Memory Remapping" (that allows for use of over 2 GB).

 

[gingerstewart55]

I don't know about that Tyan motherboard, but on most motherboards, you cannot run dual channel configs unless the memory at least matches in size.....and yours don't. If I understand it right, you're trying to run dual channel with 1GB in one channel/slot, and a 512MB strip in the other channel/slot......probably what is keeping you from accessing it.

I kow of boards that will run dual channel set up like this: 2 x 512MB in one channel (both channel A or B slots filled), and a single 1GB strip in the other channel (opposite channel from your pair of 512MB strips). But even in that weird config, you still have 1GB in each channel......never heard of a mb that would run dual channel with 1GB and 512MB as its pair.

 

[Mondoman]

Perhaps Vista is only running on one of the two CPUs? What does the Memory tab (not the SPD info) say in CPU-Z?