64-bit vs 128-bit memory ?

Hello all,
I have a mobo (Tyan K8E S2865) that can take 64-bit or 128-bit memories. In
64-bit it can use only two banks while in 128-bit it _should_ be able to use
all 4 of them.

I have tried with several sets of memories: Corsair CM72SD1024-3200/S,
Corsair CT2KIT12872Z40B (and also a few others). All sets are DDR400 PC3200
ECC unbuff 128-bits 3,1T. None of them work if I fill all 4 banks: I get
long post beeps, which the mobo manual identifies as memory errors.

The manual (ftp://ftp.tyan.com/manuals/m_s2865_110.pdf ) says that the
64/128 bit detection is automatic, however lshw returns the following when
in 2Gb config:

# lshw
machine
description: Desktop Computer
width: 64 bits
capabilities: smbios-2.3 dmi-2.3 vsyscall64 vsyscall32
configuration: boot=normal chassis=desktop
*-core
description: Motherboard
product: NF-CK804
physical id: 0
*-firmware
description: BIOS
vendor: Phoenix Technologies, LTD
physical id: 0
version: 6.00 PG (11/14/2006)
size: 128KiB
capacity: 448KiB
capabilities: isa pci pnp apm upgrade shadowing cdboot bootselect
socketedrom edd int13floppy360 int13floppy1200 int13floppy720 int13
floppy2880 int5printscreen int9keyboard int14serial int17printer int10video
acpi usb ls120boot zipboot
*-cpu
description: CPU
product: AMD Athlon(tm) 64 X2 Dual Core Processor 4400+
vendor: Advanced Micro Devices [AMD]
physical id: 3
bus info: cpu@0
version: AMD Athlon(tm) 64 X2 Dual Core Processor 4400+
slot: Socket 939
size: 2200MHz
capacity: 3GHz
width: 64 bits
clock: 201MHz
capabilities: fpu fpu_exception wp vme de pse tsc msr pae mce cx8
apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht s
yscall nx mmxext fxsr_opt x86-64 3dnowext 3dnow rep_good nopl pni lahf_lm
cmp_legacy cpufreq
*-cache
description: L1 cache
physical id: a
slot: Internal Cache
size: 128KiB
capacity: 128KiB
capabilities: synchronous internal write-back
*-cache
description: L1 cache
physical id: 4
slot: External Cache
size: 128KiB
capacity: 128KiB
capabilities: synchronous internal write-back
*-memory:0
description: System Memory
physical id: 1b
slot: System board or motherboard
size: 2GiB
*-bank:0
description: DIMM [empty]
physical id: 0
slot: A0
width: 64 bits
*-bank:1
description: DIMM [empty]
physical id: 1
slot: A1
width: 64 bits
*-bank:2
description: DIMM
physical id: 2
slot: A2
size: 1GiB
width: 64 bits
*-bank:3
description: DIMM
physical id: 3
slot: A3
size: 1GiB
width: 64 bits
*-memory:1 UNCLAIMED
description: Memory controller
product: CK804 Memory Controller
vendor: nVidia Corporation
physical id: 5
bus info: pci@0000:00:00.0
version: a3
width: 32 bits
clock: 66MHz (15.2ns)
capabilities: ht bus_master cap_list
configuration: latency=0

Can soneone tell me how to force the 128-bit mode for those chips ?!?
Thank.
--
Guillaume Dargaud
http://www.gdargaud.net/


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