Alienware Aurora liquid cooling and psu - transfer to new system

[StrandedPirate]

I have the original Alienware Aurora (R1?) circa 2010 that I want to take parts out of and create a new system with.

I'm wondering the following:

Are the liquid cooling system and the psu standard sizes that would fit into an aftermarket mid tower case?
Is there a way to tell how many watts the PSU is without taking the whole thing apart?
How many watts do I need for the below hardware? I've had an extra 5870 lying around for 3 years that I want to use in a triple CrossFire setup.
What happens if the all three video cards demanded their maximum limit of 188 watts and the PSU is unable to supply it?

New components:

• 
  Corsair CC600TWM-WHT Special Edition Graphite Series 600T Mid Tower Gaming Computer Case - White
  ASUS ATX DDR3 2600 LGA 1150 Motherboards MAXIMUS VI FORMULA
  Patriot 32GB(4x8GB) Vier III DDR3 1600MHz (PC3 12800) CL9 Desktop Memory With Black Mamba Heatsink - PV332G160C9QK

Existing Alienware Aurora components that I want to transfer:

• 
  1x - Dell CPU Liquid cooling unit
  1x - PSU 875W or 525W? (can't tell, assuming 875W)
  1x - Samsung Electronics 840 Pro Series 2.5-Inch 256 GB SATA 6GB/s Solid State Drive MZ-7PD256BW (OS drive)
  1x - WD Velociraptor WD1000DHTZ 1TB 3.5" SATA Hard Drive (personal data drive)
  4x - Various sized 7200 RPM drives
  3x - Sapphire Radeon HD 5870 1 GB DDR5 Dual DVI-I/HDMI/DP PCI-Express Graphics Card
  1x - DVD R/W Drive
  1x - All in one card reader

 

[Rammy]

Pretty sure Alienware have been using the Aurora name since around 2001 lol.

On topic, everything is likely to transfer pretty easily given (to the best of my knowledge) they just use a standardish form on cases of this size.
A possible exception might be the CPU cooler, as these are sometimes limited by which socket you are going from and going to.

The PSU wattage is easy to obtain, it should have a sticker on the unit which will give you that information in a table. I'm a little confused as to why you think its 875W or 525W, that's a huge gap. I'd assume its an 875W too.
The wattage you need is a little confusing as there were at least three distinct versions of the HD5870, all with slightly different power requirements, but anything up to 1000W would be advisable (though it's quite possible if you have enough cables, it'll run on an 875W of good quality).

Also, this is a pretty weird build, what is it for? Assuming its for gaming, a triple crossfire setup probably won't help you an awful lot, and cause more hassle than it's worth.