On PSU's, GPU's, and pins

Nobledontcare

Honorable
Jul 2, 2012
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10,510
Here's the deal: I have a Kingwin 750 Watt Maximum Power PSU; with it comes PCI Express power cable of a 6+2 and 6, so essentially an 8+6 pin config.
Would I, with this PSU and pin configuration, be able to run a GTX 780 Lightning or a Sapphire R9 290 Tri-X.
And, even if able, should I get a more reliable brand of PSU, for, as far as I know, my current Kingwin doesn't have any Precious Metal and Buzzword Certificate to its name, unlike other comparable brands.
What I know of the 780 Lightning is that it requires an 8-pin/ 8-pin, while I believe the 290 Tri-X requires a 6-pin/ 8-pin. That begs the question, should I acquire the 780 Lightning right now, get all of the Nvidia stuff associated with it (Physx, etc.), or instead wait a week or 2 for the aforementioned 290 with its comparable performance to the 780 along with 1 GB more Vram and larger, 512-bit memory bus?

I'm rather stuck and any help would be, well, helpful.
 
I would dump that PSU and get a new one TBH.
Like you said, it doesnt have 80+ Certification, which means its power efficiency and more importantly voltage ripple is unknown. KingWin is a dodgy brand, that red switch at the back means it doesnt have Active PFC (a basic feature even among budget PSU's), its a 750W with only 8 and 6pin PCIe connectors (usually they have 4 (2x8,2x6) PCIe connectors) and it costs about $55, really leads me to think that PSU is a piece of junk.
I think if you did put a 780 on it, you would end up with a blown PSU and a massive bill when you have to replace the system it just took out. I suggest getting a new PSU, I really wouldn't trust that one.

EDIT: Its 12V wattage is a good 100W below its advertised wattage, and this is directly from its product page.

Over-Voltage Protection
+5V output is between 5.7V to 6.5V.
+12V output is between 13.2V to 14.4V.
+3.3V output is between 3.7V to 4.1V..

There is something wrong when the 12v rail is outputting voltages nowhere near 12v.