Your board uses the Nforce2 400 chipset; only the Nforce2 400 Ultra from Nvidia and the KT880 from VIA support dual channel. In all honesty though, you will not see a HUGE performance difference with dual channel.
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Many thanks for the explanation about the slight difference between 400 & 400 Ultra. I didn't notice while I was reading specifications. As my knowledge of today's computer hardly fills a cup of espresso coffee (very small) I'll consider a new motherboard (surely more disappointments) or some old hobby like model helicopters flying (frustrating after every crash) or glamour photography (closer to heart attack after every session). Many thanks anyway and keep in contact.