It's difficult to see how Thermalright could better the Silver Arrow, one of our best-in-test CPU heatsinks, but they aim to with the new Silver Arrow SB-E. Designed specifically with the higher cooling requirements of LGA2011 processor overclocking in mind, it features much higher cooling potential than the Silver Arrow.
As with all of the best performing CPU coolers, the Silver Arrow SB-E remains a twin-tower style cooler. Taken as read is out of the box LGA2011 compatibility, in addition to supporting AMD AM2/AM3/AM3+ and Intel LGA 1366/1155/1156/775. Rather than four 8mm diameter heatpipes, the SB-E edition moves to eight 6mm heatpipes in a more densely packed configuration, likely as an adaptation to the larger area of the Sandy Bridge-E CPU die and heat spreader. Air flow should also be commensurately higher: the package includes one TY-141 140mm fan and one TY-150 150mm fan rather than the two TY-140's of the Silver Arrow.
The Silver Arrow SB-E will begin shipping at the end of this month; pre-order pricing is listed as ~$100/75 Euro.