Quick question (followed by a slightly longer, slightly offtopic one), as I don't wanna blow these babies up, and my last daliance with SLI was dual 8800 GTs. I bought the 1200W Superflower Leadex Platinum to power my new rig which came with 3 split 6+2 pin PCIe power connectors labelled as "SLI-ready" (so one connection from PSU into 2xPCIe connectors), and 2 x 6+2 non-split connectors. If it had been three of each, great I would have plugged one of each cable into each card, but in this case I am hoping the "SLI-ready" cables mean they can be used either between 2 different cards, or in my case I am hoping to be able to use a single "SLI-ready" split cable to power each card individually. Is that the case? Be hard to see the point in them otherwise.
The split "SLI-ready" cable I'm talking about is the top one in this image:
And third from left in this image:
The reason I am concerned (and this leads a little off-topic, but I'm still mainly concerned about not wrecking my 970s!) is that my PC was freshly birthed yesterday. I'm pretty confident all the parts are compatible, but when I was testing the system to make sure it powered on (a previous build had a short somewhere that I had to remove/replace the motherboard into the case to solve) the PC would switch on fine for a couple of seconds, then switch off, and then almost straight away power itself back on again and remain on as if everything was ok. Unfortunately I can't remember at which point this started, because this only happens when I first plug in and flick the switch to on on the PSU. When the PC has previously powered up on the same "charge" (for want of a better word, basically if I haven't unplugged the PSU) then this does not happen, so the first time it happened and then did not happen when I restarted, I must have dismissed it for some reason. I have a feeling it was after the 2nd or 3rd 970 was connected, so I'll have a check of that this morning, but in the meantime if anyone knows a potential cause of this it would be great to find out.
Oh, and nothing is overclocked. No OS is installed yet, and I haven't touched the BIOS yet (something to investigate to make sure all the clocks are correct though). Its a fresh build of all non-OC'd parts. I will also double check the OC-genie button isn't pressed, although I'm pretty sure it isn't. But it does seem like a problem when its detecting the wrong OC settings and downclocking then restarting, but it all happens before the monitor comes to life to show me. I'm starting to think its a RAM speed issue though.
I'll also remove the CPU cooler and check the thermal paste coverage, but I don't see why the PC would stay on the second time if that were the issue.
Build:
MSI X99S SLI Plus
Intel i7-5820K with H110i GT AIO water cooler
4 x 4GB Corsair Dominator Platinum 2666MHz DDR4
3 x GTX 970 (from this thread)
Superflower Leadex Platinum 1200W
Samsung EVO 850 500GB SSD