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Looking for a replacement fan for my MSI mini ITX AMD hudson board
To be honest, you might not even need one, it just depends on the case that you have.
I built 4 ITX PC's using Asrock E350M1 motherboards in Antec ISK300-150 cases, I added the extra 80mm case fan and removed the CPU fans.
The next bit required a huge amount of amazing thinking and genius craftsmanship

I cut out pieces of the motherboard boxes to fit inside the case with a bend in the cardboard so that the cardboard touched the top of the CPU heatsink - this directed the airflow of the 2 80mm fans across the CPU heatsink - perfectly cool, much quieter and far less prone to failure as with this setup the system would still stay cool if one of the fans failed.
So, back to you, you simply might not need the fan, just a bit of ducting to a case fan will do as they are so low powered the smallest amount of airflow will do perfectly well.
FYI: links below to compare motherboards, the design, layout and heatsink size are very similar.
http://uk.msi.com/product/mb/E350IS-E45.htmlhttp://www.asrock.com/mb/overview.asp?Model=E350M1Andy