First of all, RAM has more than doubled from 40MB to 88MB, we don't know what improvements have been made to the procesor, cache sizes, bus speed, no information on the capabilities of the GPU apart from the clock speed.
How on earth can you confidently band around the GCx1.5 nonsense when so much information is unavailable? Developers and Miyamoto have stated that Wii is significantly more powerful than the GC.