between the 2? kuhler has better test results. Neither is that great. I wouldn't expect a solid load performance on either of those, let alone AIO in general at 4.5
AIO perform almost as good (and in most cases worse) than top end air coolers. I am a watercooling and overclocking nut. But I honestly recommend against AIO for most overclocking. You are better off with a beginner custom loop, or a top end air cooler
Air: Thermalright Silver Arrow, Noctua DH-14, or Phantek (but last i heard they are getting hard to find)
Water: Swiftech H220 (out of stock everywhere but a good bieginner kit) XSPC D5 240 RS, RX, or EX depending on space.
Bottom line, decide what you really want - 4.5 performance, or cheap cooling - you cant have both
*Preemptive strike* I dont want to hear about the awesomeness of H100 either - no better than any listed above