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Stupid question of the day - GPU power content

bunnox said:
its a twin cable and will be fine.
where did i say only to connect one of them
Click to expand...

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)
 
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.
 
Tonester0011 said:
Wtf? What kind of animal have you got inside your PC :D
Click to expand...

Well it's about 6ft, hairy and eats like a beast, wait, hang on, that's just me :p

Got a good deal on a 1200w Enermax, same price as the 850w I was looking at, so thought why not, my pc will likely draw about 50% load on average so it should hit the efficiency sweet spot, also looking at SLI some point in the future etc etc :)
 
PorkPieCat said:
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.
Click to expand...

Mines the 30A x 6 rails, not sure about the OPs?
 
oh crap i thought OP's psu was 30A 12v rails. my bad, OP's psu delivers the full power over a single 12v rail. then obviously the gtx690 would be fine going from a single rail... since there is only one 12v rail. cables are fine as everyone's said already :p
 
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?
 
Space Monkey said:
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?
Click to expand...

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
 
PorkPieCat said:
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
Click to expand...

Ah ok, cool, thanks for the info :)
 
whyscotty said:
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)
Click to expand...

:) 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 :rolleyes:)
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.
 
JAKUS said:
:) 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 :rolleyes:)
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.
Click to expand...

Thank you :)

Appreciate you taking the time to explain

You can teach a old dog new tricks
 
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