Originally posted by: Lanyap
The early GC68s had a mirror finish bottom. Somewhere along the way they changed and made the bottom course. I guess to save time and money because they became very popular so they had to manufacture more to meet the demand. I think they became very popular because it was the lowest priced HS that could use a 80mm fan without mods. Lot's of folks were replacing the stock fan with a Panaflo L1, NMB or other very low noise fan. The clip was/is a pain to work with. If you are looking for a low cost HSF and are not planning on OC'ing this is a decent HSF fan.
You should also check out the new
GC69. They have made some nice improvements over the GC68. I have several of the GC69s from SVC. The bottom is not mirror finish but it's not as rough as the GC68s. The clip is better and the HS design seems to be better. It's selling for $5.50 + shipping at SVC. Shipping for me (CA > AL) is $3.99 First Class USPS, $4.85 Priority USPS and $6.50 UPS ground.
stevejst knows a lot about HSFs but he can be a little snobish somtimes.