Tiny server PSU for eGPU

Hi,

I'm looking forward to make a slim eGPU enclosure and I need a new PSU, my 700W isn't powerful enough (25A per 12V rail makes my 480 crashing.).
The 360 PSU is way not enough powerful for my GPU, so I've looked on server PSU side and I've found a great and tiny one!
For 139$ you can get a 22cm* 5.5cm*4cm (8.66" * 1.97" * 1.57"), 400W (+12V @ 33A) and it is also a 80+ Gold PSU!

You can find it here : Newegg.com - SuperMicro PWS-406P-1R 24Pin 400W Server Power Supply Module - Server Power Supplies
But I have absolutely no idea on how to exploit it, there's no power wire, but only a weird connector... I really need some help, if you have any ideas please share




Some specs :

Power Supply
400W (1+1) Redundant SuperCompact Short-depth AC-DC high-efficiency power supply with PMBus and I2C
AC Input	400W: 100-240 V, 50-60 Hz, 6-3 Amp
DC Output +5V standby	3 Amp
DC Output +12V	33 Amp
With Power Distributor	+5V: 25 Amp +3.3V: 25 Amp -12V: 0.6 Amp

I'd love to put it on a side of my gpu and make a custom enclosure, which is rather small and flat, I'd so love to get an eGPU enclosure which is only 4.5cm heigh, 28-30cm long and 18-20cm wide.
Thanks in advance!