As far as the specs, Being in one place makes it earier for those trying help. I had to scan around an read serveral posts to see what mobo you had. Never did find ram (I just on assuming it was pc3200). PSU is nice to know too (the other peripherals give an indication of the laod its bearing).
In checking through several boards on the Asus, it seems BIOS are all over the place. Apparently some not-too-long ago versions did not allow for multi's as high as 15. I was unable to determine if official BIOS allow for auto recognition of mobile's. Either it does, or you've flashed to modded BIOS?
That mobo should NOT have a problem @ 200FSB, if it does it s/be RMA's as it doesn't meet advertised specs. Since it apparently does not provide an option for chipset voltage increase, the question is MUCH over 200FSB it will do. Although I did find peeps with your mobo and cpu running as high as 217FSB (or so they claimed, but I've no reason to doubt them).
If 11 x 200 doesn't work, b4 I went through the PITA of rma'ing I'd try a couple of things.
1) Put MBM5 on there, and select the "sys log" feature. Set it up to record in one second intervals and write to a text.file. It will record all voltages and temps every second and record to text doc. Roll the cpu back to 11 x 166 for the install. Then when you return to 200FSB and crash, you'll be able to see if there were voltage fluctuations that may have caused it (might have to return to FSB 166 to read it). I'm not familiar with the Silverstone, nor slick enough to do the math off the top of my head. But it's max load on the 12v rail is 18amps. Should be enough, but with a 9800 pro etc, you never know till you monitor it.
2) I'd try just one stick of ram. If you see "DC" on your bootup screen, you've got 'em in the right slots. But often, peeps don't get 'em in the right slots. etc.
3) There are many BIOS adjustments that can help/hurt. etc. Also do you know version you have? (Prolly on bottom right of initial post screen). Have you flashed b4?
4) Are getting any beeps at all? Its not real clear what its doing at 200FSB (I did see mention above of pauses in post), refusing to post or just failing to load windows etc.
5) Instead of cpu/dram ratio set to "auto", I prefer 1:1 etc. "Auto" or by "SPD" is fine for the timming though.
Your components are top-quality. That mobo is a good one. But I never assume new parts are in good-working order. Have had too many new parts which came defective. But when something doesn't work as advertised, I assume user error first (even me), cuz that's what it usually is
Hopefuly the switch to the 11 multi will clear it up. If not, definatly do the MBM5 sys log and rule out PSU.
Good luck with it.
Fern
EDIT: Which revision is this mobo. I have been *gasp* assuming its a NEW mobo. If its revision 1.0x, it prolly ain't gonna do 200FSB (although some claim it will with new BIOS) 
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