I think Tennmax has built a h.s./fan to replace the greenie..I think it's called the lasagna cooler, and it replaces the original...also I seen some h.s/fans made for replacing the greenies, and even had the little tabs for the plastic clips. At $5.00, I should'a bought one, but I don't want to pull apart my box, just to cool the greenie, but I am blessed,because my greenie is located right under my alpha, so it's getting plenty of air.
you might try cooling your clock generator...I took a TO220 heatsink from Radio Shack ($1.49), sliced it, and glued it on my clock gen with arctic silver thermal glue,and droped my temps by a degree or two...and with o'c'ing..every little degree you can drop is potentialy either more speed or more stability.
attached is a pic of my clock gen with heatsink added.
One final note...DO NOT use too much glue, in my pic, you can see that I came close to getting the glue on my contacts.