Silver Arrow T8 appears to basically be a stripped down Silver Arrow IB-E without caps on ends of heatpipes and a single 600-1800rpm fan (TY-143B). I have not tested one but I'm betting it will perform the same too, just have a slightly different curve than IB-E with 2x TY-147 1300rpm fans, but basically the same cooling ability with 1800rpm fan possibly giving a degree or two lower temp at full speed.
Phanteks Owners Club Ways to Better Cooling
i7 980 @ 3.55GHz =PH-TC14PE w/2x TY-143 fans =Crucial Ballistix 3x4GB =GA-X58A-UD5 =ASUS GTX580 DirectCU II =Enermax Modu84+ =Define R2 w/3x TY-140 case intake fans; all PWM controlled by CPU fan socketPhanteks Enthoo Primo MoBo Rampage III Extreme CPUi7 980X
@ 4.0GHz =R1 Ultimate
w/2x TY-143 fans =Dominator GT 6x2GB
=Rampage III Extreme
=ASUS GTX580 DirectCU II
=Enthoo Primo w/ custom castor base