New rig build - secondary drive keeps failing

[xizorgetspeed]

Hey guys,

I just finished building a system but I do seem to have an issue though and I really hope it's nothing major.

http://pcpartpicker.com/b/Rg2RsY

So since the entire world is still waiting to get their hands on the 1080, I am using my older GTX 480 fermi edition from EVGA.

My second drive (WD 5TB) occasionally just disconnects and only way to get it back is to power off the system and then boot back up. Sounds like it's a power issue and I remember the 480 being a beast of a card (which is why in my previous system I ran a 1050 W power supply). This time I went only with 650. Using various PSU sizing tools, they do however say that 650 should be fine even with the GTX 480...

I am using only 2 sata cables from the PSU. 1 plugs into the SSD and a plug which I believe is for the cases lights and the RGB LED strips I'm running, and the other plugs into the WD drive and then into the PWM hub which is essentially a splitter for running 3 140MM fans.

So thoughts? I really hope I didn't buy too small of a PSU...

 

[ComputerSecurityGuy]

I'm not a huge PSU expert but the fans may be draining the 3.3V rail enough to shut down the hard drive. Or maybe it is the 5V one. Try using another SATA cable for the fans, it might help.

 

[xizorgetspeed]

Okay so a few updates... I've now got a GTX 1080 in there. I have moved the sata drive to its own power cable being plugged into the power supply. There is no other part plugged into this cable. It still randomly disconnects. I should add that it always does this when I'm gaming and never at any other time. And the only way to bring it back is to power off and boot back up.

It shouldn't be power supply because 650 W should be enough right?

Is it a driver thing?

It doesn't always happen, I can game for hours and no issue, but when it does happen, it's always when i'm gaming...

Thoughts?