Here are the current result with the Scythe Ultra Kaze in push config, I guess temps are in acceptable range now.
Started Prime 5:
*farm6.static.flickr.com/5305/5843181110_1fd2eb27b0_b.jpg
Temperature midway:
*farm4.static.flickr.com/3414/5842636785_ce6f50101f_b.jpg
Few minutes later, @4.6GHz:
*farm4.static.flickr.com/3233/5843182160_fe303121cb_b.jpg
Stopped Prime95, back to 1.6GHz;
*farm6.static.flickr.com/5229/5843182812_7912a98a37_b.jpg
Idle for few minutes:
*farm6.static.flickr.com/5102/5843183454_74434f915a_b.jpg
Idle temps:
*farm4.static.flickr.com/3578/5843184124_9f92f52782_b.jpg
Started Prime 5:
*farm6.static.flickr.com/5305/5843181110_1fd2eb27b0_b.jpg
Temperature midway:
*farm4.static.flickr.com/3414/5842636785_ce6f50101f_b.jpg
Few minutes later, @4.6GHz:
*farm4.static.flickr.com/3233/5843182160_fe303121cb_b.jpg
Stopped Prime95, back to 1.6GHz;
*farm6.static.flickr.com/5229/5843182812_7912a98a37_b.jpg
Idle for few minutes:
*farm6.static.flickr.com/5102/5843183454_74434f915a_b.jpg
Idle temps:
*farm4.static.flickr.com/3578/5843184124_9f92f52782_b.jpg