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6850 on a 460W PSU? - Page 2

post #11 of 19
Thread Starter 
Im not summing as 18+16+8 = 42 and not 32. Im doing it as I read on an article about PSU.

All 3 rails combined cannot exceed 385W, this gives a combined amp of 32A. Like I said, not just adding the amps on each rail.
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post #12 of 19
Quote:
Originally Posted by kiurys View Post
Im not summing as 18+16+8 = 42 and not 32. Im doing it as I read on an article about PSU.

All 3 rails combined cannot exceed 385W, this gives a combined amp of 32A. Like I said, not just adding the amps on each rail.
Yes, yes, but still the amps noted on each rail can not be exceeded, if they are- the PSU will shut down. This W fooling-around is typical for PSU companies, trying to make their PSUs look more powerful than they are.
Although you may be able to deliver 32 amps on a rail without damagin anything, the PSU will (should) shut down, as the protective circuit for that rail allows ony 18 or so amps. Anything above that is considered short circuit. And I'm off to bed, hope I've been helpful.

EDIT: Anyway, as I said, on the 18A and 16A rails, a 6850 should be well fed. Just don't wire it to the 8A and you should be fine.
Edited by ronnin426850 - 2/20/11 at 3:39pm
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post #13 of 19
Power supply's are cheap just buy one ????? Save yourself the worry.
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post #14 of 19
Thread Starter 
Alright perfectly understood.

So connecting to 18A rail should be ok? Do I need to check if the CPU is already connected on the 18A rail? They need to be on different rails since they are the two components that draw the more power right?
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post #15 of 19
Quote:
Originally Posted by kiurys View Post
Im not summing as 18+16+8 = 42 and not 32. Im doing it as I read on an article about PSU.

All 3 rails combined cannot exceed 385W, this gives a combined amp of 32A. Like I said, not just adding the amps on each rail.
Yes, you did it correctly. 385w / 12v = 32a. Keep in mind, that is PEAK power, not continuous. So you can't draw 385w / 32a all the time. You could probably get by with 250w / 21a continuous as a guess.

Keep in mind, wattage and amperage means literally almost NOTHING with power supplies. It's the quality of the internals.

Being that its a newer Dell, it should be just fine with your planned build + even a 6870. It'll handle it fine.
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post #16 of 19
for what its worth op I ran a gtx275 on a seasonic 430W psu
it is a dual 12v psu, 17A on both rails
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post #17 of 19
OP, you should be fine. I did some more reading and your PSU should have one PCI-e power connector. That is all you need for a 6850.
post #18 of 19
Thread Starter 
Would you mind sharing what reading you did? From what you said you basically found what type of PSU I have? Id like to know that.
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post #19 of 19
Quote:
Originally Posted by kiurys View Post
Would you mind sharing what reading you did? From what you said you basically found what type of PSU I have? Id like to know that.
You have a Delta 460w. That's more than plenty for your planned build, as Delta makes good units. It's almost the same thing as the Antec Basiq 500w.
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