That is a bit of a harder question, you will have to do the math or contact us. We are always happy to assist. A single motherboard RGB header usually outputs a maximum of 2-3A of power. We advise you to consult your motherboard manual for details on specific headers. For example, a single 3A 12V RGB LED motherboard header on ASUS Rampage VI could power 10 EK-Vardar 120ER RGB fans, an R6E RGB monoblock, RGB GPU block, an RGB reservoir safely and still have power left over for an additional LED strip of ~1m length.