TweakTown uses a different method for testing CPU heatsinks which allows for an even playing field across all product tests. We feel that by using the same ambient temperature and strict lab-like testing procedures we are able to accurately compare one product to another. More information on our testing procedure can be found in the T.E.C.C. article here.
The PWM and Silent version of the IGLOO 5710 performed about the same in our tests. The only other coolers that we have tested thus far in this price range are the two from Rosewill; both the Z4 and Z5 out performed our GlacialTech coolers but they also cost a little more. Performance was better than the retail stock AMD and Intel coolers.
Our SPL testing shows that the 5710 Silent has a wide range from idle to full load. When the system is doing light duty activities the Silent model is one of the quietest coolers we have tested. When the system is running full load however it runs in the middle of the pack when compared to the other coolers we have tested.
The PWM model leaves quite a bit to be desired when it comes to acoustic performance. At full load it is one of the loudest coolers we have tested thus far, and even the idle performance is poor.