In reply to purplemonkeyelephant:
Technically yes it will, as a loop is stronger than a single strand of any given cord. The question is whether if matters....
The cord I carry is 7mm and 15kn breaking strain and is a single strand with Figure of 8s on each end.
knock say 30% off for knots and you end up with 10.5kn Breaking Strain.
most nuts aren't rated above 10kn (even size 10 for the new WCs), so the end result the cord is pretty much as strong as the nuts. Do I ever expect to load a placement so highly that they metalwork it's self fails? No, I can't see it ever happening.
Also given I'm generally belaying off 3 anchors, each leg of that anchor has the same 10.5kn range. so a combined load resistance of 31.5kn.
Again, can I see this level of loading being applied to the belay? No.
add in that the peak force exerted by most ropes in a fall is about 7Kn and you've even more re-assurance.
So the long and short of it for me is that though technically a single strand is weaker than a loop, the end result is still well within acceptable limits as far as I'm concerned.
You can always link the ends of your single strand to create a look for less spread out anchors as well, and if you are tying a BFK in the cord, single strand is a lot less bulky and messy looking.
Ultimately up to yourself (and your climbing partners) what you are happy with. With weaker cord, I'd re-assess my approach - I chose the breaking strain for a reason.
Cheers!
Stu.
PS all the numbers there are very approximate.