My Asus mobo is reading the speed at 133/33.
Also let me make a clarification: it is a Athalon <b>MP</b> 1800+. I made a mistake while ordering, and I was told that it would work just the same.
I am sure it came in retail box, hell I had to cut the damn thing open, and I still have all the paper work.
~Taylor
*edit* Looking at the box now and it even reads: '<i>AMD Athalon MP Quantispeed Architexture Operates at 1533mhz. Assembled in Malaysia.</i>'