The Old Camper

@Stefan Payne Thank you! Apparently other users of this case have successfully upgraded it with an ATX PSU so I will give it a shot...

Hello all, This is my first post I'm considering to upgrade my system's PSU, in order to upgrade the GPU (currently it runs perfectly fine with the 460W stock PSU and GTX 1060...) Current configuration : Dell XPS 8900 with stock PSU (460W) Motherboard - Dell XPS 8900 (chipset: LGA 1151 / Z170) Processor - Intel Core i7-6700 CPU Cooler - stock GPU - GTX 1060 FE -> to be upgraded to GTX 1080, GTX 1080 Ti or future nVidia high-end GPU (no overclocking) Memory - DDR4, 2x8 16GB, 2133MHz SSD1 - M2 Hynix, 256GB SSD2 - PCIe - M2 adapter with Samsung 950 Pro, 512GB HDD1 - Seagate 2TB, 7200rpm HDD2 - Seagate 1TB, 7200rpm DVD/CDRW Combo Drive Case fan x3 Special PSU requirements: compact dimensions 140 mm (W) x 150 mm (L) x 86 mm (H) I've been considering Seasonic's PRIME Ultra 650 W Platinum (SSR-650PD2) for months, but I can't get hold of it. However, both the 550W and 750W versions are now available. I would prefer to aim for the best efficiency in order to keep power consumption & heat to a minimum. According to http://www.coolermaster.com/power-supply-calculator/ the load wattage would be 448W (GTX 1080) or 520W (GTX 1080 Ti), however their recommended PSUs are either 700W or 750W!! Do you think the Seasonic PRIME Ultra 550 W Platinum would be enough? If so, is it worth the upgrade from the stock 460W? Thank you