which one of these coolers is the best for overclocking 1055t to hit 4 ghz or higher.(price/performance)
2)zalman cnps 10x exterme
3)Zalman CNPS10X Flex (2-Fans)
4)Thermalright Ultra 120 eXtreme
The Noctua NH-D14 will be the best very closely followed by the Thermal right and the Zalmans not far behind (they are all very good) if theres not much in the price the cheapest will be the best value, you could also consider the Tuniq Tower 120 Extreme it would roughly slot into the middle of them. The H50 will be the most expensive and the poorest cooling performance but will be the quietest.
corsair h50 with dual fan ( pull/push ) is better than single fan and it is quiet too.zalman cnps 10x exterme is better than noctua nh-d14 and it's noisy.betweem noctua nh-d14 and zalman cnps 10x exterme i choose noctua-d14 but it is very big.see here http://www.overclock.net/air-cooling/720137-worlds-best...
noctua nh-d14 and corsiar h50 has same price but with dual fan corsair will be better than noctua nh-d14 and it is quieter.tuniq tower 120 exterme and Thermalright Ultra 120 eXtreme in my opinion is the best for price perfomance.