Man of Honour
- Joined
- 8 Nov 2007
- Posts
- 16,160
- Location
- Outer Space
holy cow, do you use a nuke to power your pc?
yeah, should be more than enough.
Hee hee, its the only way to be sure (nuke it from space)

Please remember that any mention of competitors, hinting at competitors or offering to provide details of competitors will result in an account suspension. The full rules can be found under the 'Terms and Rules' link in the bottom right corner of your screen. Just don't mention competitors in any way, shape or form and you'll be OK.
holy cow, do you use a nuke to power your pc?
yeah, should be more than enough.
I've got 6 rails at 30A per rail so should be ok on a 670?
its a twin cable and will be fine.
where did i say only to connect one of them
Wtf? What kind of animal have you got inside your PC![]()
oh, i would strongly recommend you use two separate rails. the cable doesn't matter, it's designed to allow the full power, but 30A 12v = 360 watts per rail. the gtx 690 overclocked can go over 400 watts (!!). i don't really understand it myself, i thought 8-pin allowed 150w total, but your own power supply delivers 180w per 8-pin, and mine is 40a per rail (therefore 240w per 8-pin). and the reviews don't lie; i've seen at least 2 reviews where max draw for the 690 exceeds 400w, in which case one of your rails is insufficient to power your card.
use two 12v rails.
My thinking was that, as the psu came with cables that split into 2x8 pin GPU, then it should handle running a high end card from that one cable? As surely only high end cards use 8 pin power connections? So my 670 (2x6 pin) should easily run from a single cable that splits into 2?
Just trying to collate what's been said and see if my thinking is ok, I don't really want to have to use another 2x8 pin cable just for one GPU?
yeah you're fine. the cables aren't the problem as i was trying to explain, it's just how many amperes per rail your psu can deliver. your psu delivers 360w per rail (VxA=W), and more than 360w for a gtx 670 seems outlandish!
someone correct me if i'm wrong
That splitter only has 1 x 8 pin which connects to the psu,
so unless I'm mistaken that only allows for 150watts to be drawn.
This is how I understand it to work, if I'm mistaken or ill informed
please educate me(I'm not trying to be funny)
It's not really like that, the only reason we have all these stupid connectors is because people do not understand volts amps and watts, so to stop the muppets from using unsuitable power supplies and returning GFX cards, they only put the connectors on PSU's that are powerful enough to run the the GFX cards,(example,an 8 pin only has 3 12v feeds like a 6 pin, yet they rate the connector higher
)
If you have a PSU maker that terminates their modular connectors to the psu with a connector like a pcix plug, you can be pretty sure they have tested it.. or everyone would send them back.
A common rail PSU means it has only one big 12v output and all the yellow 12v wires go back to the same place, one of the reasons these came about is because people do not understand load balancing for multiple rails and each rail if independent can not share unused capacity.
Thank you
Appreciate you taking the time to explain
You can teach a old dog new tricks