Thanks nmsuk.
Well ive had a lot of issues with PSUs being inferior at the time I chose to upgrade my computers with either CPU or GPU.
I dont upgrade that often anymore, I tend to get some descent hardware by the time I upgrade, to prevent myself from constantly replacing parts to keep up.
The reason im upgrading the CPU now from x4 3.4 to x8 4.0 is that I plan on be running some HTC Vive on it and also, some games (like Mafia III) is starting to demand better CPUs.
But my GTX970 still pull most games like a charm, even in 5760x1080 and its prolly bottlenecked by the x4 CPU.
The last time I did an upgrade, the PSU had to go as well when I went from GTX470 to my current GTX970.
I checked some more on that LC8700 PSU and despite it saying that itll carry 18A on each 12v supply along 30A on the 12v mainboard supply + some on the 5v and 3.3v parts, it says 700w total peak, which is way less than if you add up all the claimed amps per part.
Just like the 4 18A parts at 12V, thats 12*18 = 216 Watt pert part, which by far exceeds its rated total peak power.
Besides, when PSU power by wattage is rated as "peak", it usually means it will only be able to deliver that amount of power in short bursts, just like when you have RMS and Peak wattage on your stereo amplifier, which basically is a PSU as well, where RMS is the continuous power, while peak is usually twice the RMS output, which is what the amplifier is capable of delivering for short amounts of time, normally a couple of seconds and hence will work for sound like bassdrums which due to their low frequency pulls a lot of power.
Finally, there's also the efficiency rating of the PSU and the combined wattage of a PSU, usually refers to how much power itll draw at the wall socket, but 700w at the socket, doesnt account for the losses during its way to the components in the computer; again, like for instance the very common class AB stereo amplifier that may be rated 100W, will be able to put somewhere around 80% of that thru to your speakers.
Maybe im so "lucky" that those factors are the very reason that my PSU isnt up to the job after all.....at first I didnt expect it to be a problem, but that was before i noticed it saying 700W total peak, as I never use the total as a reference, because the PSU has that summed up from 3.3, 5 and 12 volt parts and subparts.
Ill be going to pick up a new PSU later today when the store opens, hopefully itll fix it. :-D