Maximum Watt/Amp on M I/O & Lighting Board?

A quick search of eBAY for "Alienware Aurora fan" (completed listings also) will yield fan label pictures. From there, you can read the various label assortments by part#, and read their amperages, for all the different style fans that were stock. Alienware & Dell always use high-performance high-current draw fans. The 120mm fans are usually either Nidec @ 1.4a or Delta 1.6a. Hard drive fan is a respectable 0.7a. You may remove your case fans and inspect their label for their amperage. Do not doubt that if your 120's are 1.4a - 1.6a, & hdd fans are 0.7a that Alienware has already put in the max allowable amp per fan per channel. Why on Earth you would need more than .7 for the hdd fan when .7 is plenty, very respectable. Jump to .75a max I'd say. 9watts. And the 120's are already beasts. If you need more airflow in there, crank your fans up w/CC manually or set a fancurve. You shouldn't have to replace anything. But if you do, browse eBAY, read fan labels, and assume the fans w/the highest amps which were stock is the most you should consider replacing with. Honestly, there isn't much more a 1.6a can do at full steam than a 1.4a can't do either, both will be like small hair dryers, & you should never have a reason to run a 120mm fan at full steam either ... gracious. A 1.4a at full steam should take care of any problem ... and the 0.7a too. If you decide to buy a non-stock Alienware fan, make it a pwm, and honestly? .7-.75 maxon the hdd, but, 1.4a or less for the 120. If you're worried about a melt down, the 1.6a tips the scale closer than the 1.4a (or less) would. You decide.

***Volts X Amps = Watts --> 12v x 0.7a = 8.4w  --> 12v x 1.4a = 16.8w  etc etc ***

I don't have an Aurora, I assumed your pci was 120mil, but I have experience with Area 51 & Dell XPS, & Dell reuses the same fans & suppliers throughout the product lines. I took 4 minutes on eBAY, saw some Aurora fan assortments, and went: oh yeah, same old same old.

Remove your pci-e fan & check its label. If you do not have a pci-e fan, message an eBAY seller to come up off the specs on what he's selling. Glean the part # from his listing and run it through Bing-Google, you will get hits. I have a 120mm pci fan (1.6a) to my master I/o. I have a rear 92mm 3-blade Delta case fan @ .75a, 84cfm, 4000+rpm. This is the Delta they sing praises about, though its a 3 pin. IMO @ 92 mil w/my specs, at some point even if you buy something similar to it or better, the noise will get to you eventually. The highest draw 92mil fan I've seen Dell put in was in an XPS @ 1.1amp, and, you would not want that thing spinning at 1.1amps, lol.

You will NEVER get a spec sheet on the m I/o from Alienware. Never. This is why you assume they already put their top fan in it, & you get the same or a similar fan & don't cross the barrier by 5-10% more amps. Dell might skimp here and there, but they never skimp on their fans, in fact they overcompensate. I've seen them use 2 & 2.25 amp 120's before. Why would anyone need such a high draw fan? lol 

The power you lose to a high-draw fan will be power less available to your vid cards, so, an Aurora owner might tell you specs here shortly, & in the meantime, google part#'s and assume the highest draw Aurora fan you find could have fit your case too, and roll with it or something w/same specs +/- 5%, 10 max ... cfm is where it's at, which comes by design. For instance, find a .75a w/the highest cfm you can find, then put it in if the price is right. High amps does not make for a better fan ... performance gets counted in cfm's ... and so do results.