這個，恩，我是覺得一些論點大家可以討論
1. 各廠對噪音值根本是各自表述，天知道他們是在幾公尺多少距離量的
2. 同一個廠牌的滾珠系列通常都比同一個廠牌的油封系列略吵，你把所有廠牌的油封、滾珠都放進來比較，會把單純軸的差異給擴大到風扇整體品質、設計，模糊了焦點
3. 你引的網頁，整頁都是描述油封＆油封改
4.
http://www.silentpcreview.com/article690-page1.html
我把同樣網頁第一頁重點給點出來
# (Sleeve) Quieter than ball bearings, especially at low speed, and stay quieter throughout their life — the most compelling aspect for SPCR
"Most ball bearing fans are noisier by 1 to 3 dBA over their counterpart sleeve-bearing fan
Don't use them (sleeve) in any orientation other than vertical.
Don't expect them (sleeve) to last as long in very ...