Memory and dual channel problems

Hi
Can someone help me?
1- I have 2x512 MB DDR 400 Twinmos CL 2.5 and amd xp 2600 (fsb 333) and Msi K7n2 delta L. I have tested separatly my sticks, one of them woks great, if i put dram clock at 166 or 200 the sytem is always stable. The other stick is not so great , if i put him at 200, most of times the sytem doesn´t boot and the lights in the d-bracket display memory problems, when it manages to boot, when i get to windows i´m always getting blue screens with error messages. If i put to 166 it´s more stable, but sometimes hapens the same, but less frequently.
I have run memtest, but it shows no errors in both sticks.
2- When i use both sticks together in dual channel dimm 1 & dimm 3 sometimes windows only displays 512 MB, but if i reboot the sytem, i get 1 GB as it should be.
It is not frequently, but sometimes it hapens.
3- How can i detect dual ddr is working or not?
I´m asking this becouse the two sticks i have are similar, but there is a little diference, one of them has twinmos chips and the other has M.tec chips. But both are from Twinmos. Sisoftware sandra shows them as equal.
I have heard that this mobo, on the boot screen should display something like this:
Memory Mode: Dual Channel
or
Memory Mode: Single Channel
But in the boot screen it only says DDR 400 or DDR 333 acording to the setings i have put in the bios.
My bios version is 5.1 (4/18/2003). Do you think i need to flash the bios?
Thanks
Pedro Cascão

Sorry, i forgot to post my bios settings.
CPU fsb clock 166 mhz
cpu interface normal
fsb/dram ratio 1:1
current dram clock 166 mhz
memory timings:
t (ras) 8
t (rcd) 3
t (rp) 3
cas latency 2.5
agp voltage 1.5 v
dram voltage 2.7 v

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