Hello, I'm building my first ltc mining rig with these components;
ASRock 990FX Extreme3 AMD 990FX Mobo
AMD Piledriver FX-4 Quad Core 4300 CPU
2 x Asus HD7990 GPUs (3rd on the way)
2 x 8GB DDR 1333
Diskless using just a pendrive to load ubuntu
It's going to be an open rig using PCI-e powered risers with a large fan blowing towards the GPUs.
I'm hoping I'll be able to fit 3 of those hd 7990 cards, which from what I read are rated at around 430w per GPU. I'm not sure if this motherboard will register all 3 GPUs being dual (so the system should register 6 GPUs?) but the mother board only has 3x PCI Express 2.0 x 16 and one PCI express 1x slot, I can fit 3 or maybe even 4 of those GPUs just fine using powered risers but would they register/work?
I have these choices for a PSU;
http://www.amazon.com/gp/product/B002BH3Z84/http://www.amazon.com/gp/product/B008PBU4RU/http://www.amazon.com/gp/product/B0057JFOKU/http://www.amazon.com/gp/product/B00DJ5A238/I've read tons of renews on the above PSUs on different sites and it seems that buying a PSU is like buying a cat in a bag, you never know what you're getting. People reporting their PSUs dying after few hours to few weeks really makes me uneasy. Shipping is complicated and expensive to my country so returning the PSU would be quite the hassle for me especially since I do not deal with amazon directly since they do not ship to my country.
Any input would be much appreciated.
