Do we not need to get certain wattage rating for the resistors as well as ohm?
yes we do. but the oem resistor was 4.47k in circuit and i think 8.3 k pulled if so it had a low watt rating due to its size.
these are close to the size and quality of the stock resistor they don't handle much power.
http://www.ebay.com/itm/8-2K-OHM-SMD-1206-Resistor-5000PCS-One-Roll-New-RoHS-/200999285608?pt=LH_DefaultDomain_0&hash=item2ecc7db368items that small simply can not handle much in terms of watts.
on the ebay link the most any of those resistors need handle = 1/4 watt
the ones on the antminer are most likely 1/4 watt or less.
I am not the best authority wait for more confirmation on the correct pot to use