Can DDR2 PC4200 memory run at PC5400?

If the motherboard supports ddr2 400 up to 667, then you can use your PC2 4200. Most RAM will overclock but again it depends on the tweaking options available in the BIOS. Only enthusiast boards have the full tweaking menu. Higher overclocks may be attained by loosening the timings.

You can use the PC4200 ram. The 667MHz FSB specification is the maximum speed. Your ram can be slower.

If you mix PC4200 and PC5400, all the ram will run at the speed of the slowest speed ram installed (PC4200)

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I don't think there is a motherboard that can make it go that high. Research your motherboard and CPU purchase better next time!!!

I think the numbers should speak for themselves, or else you will have instability in your system.

no, memory can clock down but not clock up. get the memory from www.buymemory.com

Yeah of course it can.