Corsair has made another high quality product. I bought this to upgrade from a Corsair H80i closed loop water cooler and I did so to help drop my CPU temps in an overclocked I5 system. I was not pushing crazy overclocks but I wanted a more efficient, larger cooler to match my Corsair Air 540 case. To be frank, the H80i rocked, this was more of a i just wanted it upgraded than anything.
The radiator is a bit thicker and care must be taken when matching to your computer case and motherboard. The Corsair Air540 can take a full H80i in push/pull config, and the H105 is no different. The rad is a bit thinner than the H80i rad but that makes it easier to mount in push/pull configs, but I highly recommend only a Pull config given how efficient this H105 is as a cooler.
I was getting idle temps at 40 degrees C, and load temps at max 60 degrees C on my H80i at 4.5Ghz overclock I5.
Now I get 29 degrees C at Idle, and 52 degrees C at full load on the H105 at 4.5Ghz overclock I5.
The included Corsair SP120 fans are much quieter than the H100i and my H80i fans, those fans on the H80i and H100i are nasty loud at even low speeds. But Corsair listened and put much quieter 120SP fans on the H105 this time and they are much quieter overall. At full speed they will be heard but not nearly as loud as the previous fans Corsair included.
I chose to swap the included Corsair SP120 fans to Noctua NF-F12 fans in only a pull config. Not only is pull easier to dust clean, the pull config makes it easier to have an efficient power use setup while being able to get performance from the higher quality Noctua fans overall. The H105 with Noctua NF-F12 fans makes a world of difference on sound as well as performance over the included Corsair fans. I love Corsair products, but based on research and help from Linus Tech Tips on YouTube the matching of the H105 and the Noctua NF-F12 fans is a heavenly setup. Quiet at normal operations and if I want to add extra cooling I use an NZXT Sentry 2 fan controller to bring the Noctua rad fans up to full speed and they are still far quieter that the Corsair fans at low speed. Love this setup.
The included thermal paste with the H105 is top end, and I saw no difference in thermals using it over Arctic Silver 5. Corsair uses top end quality materials.
Be warned when mounting the back plate and mounting standoffs it will be loose fitting. DO NOT FREAK OUT!
Its normal, and once the pump and cooling block are mounted and you start to tighten the thumb screws down by hand you will feel it pull tight and secure perfectly. Only tighten by hand to hand tight. Than using a screwdriver, by hand, tighten another half circle tops, no more is needed.
Plug the pump into the CPU fan header and your at 100% power to the pump and its dead silent. You can plug your rad fans into motherboard headers but honestly using a fan controller is a far better option. It allows for much better control of the cooling fans and you can bring them to low power during non-gaming times.
Highly recommended product by Corsair!