RGB Limit on Motherboard
The 60 led limit is per rgb connector on motherboard... it's just a number picked based on maximum current (3A) and total led strip length. Fans don't count, those leds are powered from 12v in fan connector.
Each RGB led can consume up to around 15-20 mA per color, so let's go with a simple round 50mA per led. 60 leds then give you 60 x 50mA = 3000mA or 3A.
The motherboard has no way of knowing how many leds are on a strip, they just say 60 to protect themselves, so you won't damage the connector by connecting a strip which sucks more than 3A...
If you have a single color led strip, or a strip that's more efficient or lower power, let's say one with max 5mA per color (like a high eff. red only strip) or 15mA per rgb led, in theory you could have 3000mA / 15mA = 200 leds.
Length limitation: the longer the strip , the bigger the losses ... for ex. first led may get 5v, the 15th led may get 4.9v , the 30th led may "see" 4.7v and by the 60th led you may have 4.5v on the strip.. there's losses in the thin wires between the leds.
Some leds can work with as little as 3v others need at least 4.5v to work, so by saying 60 , they're also making sure user won't say the motherboard is faulty when the last 10-20 leds on a 100 led strip don't work or are less bright than the others.
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