Reddit reviews Phobya 4-Pin Molex to 4 x 3-Pin Fan Connector Cable (Power 4 Fans from 1 Molex Connection!)

A molex to fan header like this.

Or you could buy a fan controller, PWM fan hub, or something similar.

I would get a Molex to fan connector (PSU power):

http://www.amazon.com/Phobya-4-Pin-Molex-Connector-Connection/dp/B004CLDSRU

I had the exact same problem! I solved this by installing These

And this should make it easier to get it where you want them.

> Is it somehow possible to connect one or two more fans to the PC?

Fan splitters or a PSU fan adapter (beware, the last one can get pretty loud).

> how often do you change thermal paste and how do you remove it?

Not really often, once every year or so, maybe every other year. Just remember to change it everytime you remove the CPU cooler.

I would recommend getting a 3 or 4 pin fan splitter, depending on your mobos header. Running up to 3 fans on a single header is always possible.

e.g.:
http://www.amazon.com/StarTech-com-TX3-Power-Splitter-Cable/dp/B000E9ZQBU/ref=sr_1_4?ie=UTF8&qid=1420223634&sr=8-4&keywords=3+pin+fan+splitter

Other than that there are connectors for your PSU to split a molex connector to 3 pin headers, some of them have build in resistors to reduce the fan speed.

e.g.:

http://www.amazon.com/Phobya-4-Pin-Molex-Connector-Connection/dp/B004CLDSRU/ref=sr_1_2?ie=UTF8&qid=1420223698&sr=8-2&keywords=molex+to+3+pin

With built in resistors:

http://www.amazon.com/BitFenix-Alchemy-Multisleeve-Triple-Adapter/dp/B00HVBOUQG/ref=sr_1_2?ie=UTF8&qid=1420223658&sr=8-2&keywords=molex+to+7v

http://www.amazon.com/Zalman-ZM-MC1-Multi-connector-Add-Fan/dp/B000FAKUE6/ref=sr_1_1?ie=UTF8&qid=1420223739&sr=8-1&keywords=molex+to+3+pin

3-pin and 4-pin fans regulate speed entirely differently (voltage regulation v.s. pulsed), so I do not not advise that you regulate a 3-pin fan from a 4-pin connector.

Maybe this would work better: http://www.amazon.com/Phobya-4-Pin-Molex-Connector-Connection/dp/B004CLDSRU

This should do:

http://www.amazon.com/Phobya-4-Pin-Molex-Connector-Connection/dp/B004CLDSRU/ref=sr_1_5?s=pc&ie=UTF8&qid=1451316107&sr=1-5&keywords=molex+to+3+pin

Something like this if you want to hook multiple fans up to it

Alternatively, you could always just get a fan hub like this. It's neater, and allows for more fans

I wouldn't. I would get something like this.

Phobya 4-Pin Molex to 4 x 3-Pin Fan Connector Cable (Power 4 Fans from 1 Molex Connection!) https://www.amazon.com/dp/B004CLDSRU/ref=cm_sw_r_cp_apa_WyTDybTXFJFP9

Not at Amazon right now but can be sourced elsewhere.