pic: AM3CIM4U with Grayhill

[otherguy]

Can I ask why you're using the 61R vs the 63R?

We've been using the 63R256 on machines back to 2010, we've just kept ordering the same parts, I wasn't aware there were other models similar to the 63R. I took a look at the specs between the two parts, and it seems like the only difference is that the 63R part number has a higher lifetime rating and higher max RPM rating.

61R, 10 Million cycle lifetime, 300 RPM
63R, 300 Million cycle lifetime, 5000 RPM

Price points seem to be the same on octopart