Once everything was tightened down I noticed that the heatsink was turned slightly askew and didn't seem to want to straighten out. After maneuvering my head down to where I could get a look under the huge expanse of fins I discovered why; the support bars were contacting the side of the first memory stick. One option I had was to move both DIMMs to the second set of slots, however I discovered that after pulling the SI-128SE back off, the support bars could be pushed a bit further into the base, which freed up enough room to reinstall the heatsink at the correct perpendicular angle.
The size of the SI-128SE will be beneficial in helping to cool other components surrounding the CPU socket, especially the memory as it falls directly under the overhang. Voltage regulators and capacitors on the other side of the socket should also benefit from some ancillary cooling.
Continue on to testing and conclusion.