Installed my 4850hd last night, huge problem

[Quiksilver]

Originally posted by: myocardia

Originally posted by: Jessica69

Originally posted by: CP5670

Yes, it usually won't make a difference either way, but if all else is equal, a single rail is slightly preferable if only to cover those handful of odd load situations that can exist. There is no advantage to having the video card on its own dedicated rail, on the other hand.

Wrong again. In actuality, nVidia WON'T certify a power supply for SLI unless the video cards are on their own rails......sorta blows your assertion out of the water.

Absolutely wrong. All of these PSU's are nVidia SLI-certified, and not one of them has more than one +12v rail.

I raise you:
Corsair
Silverstone
Xclio

 

[spittledip]

Originally posted by: DusterAZ

Originally posted by: CP5670

Originally posted by: DusterAZ
Yeah, I'd look at new PSU with dual 12v rails. It appears this has only one. I have an Ultra 500W w/ dual rails ... Ultra is not exactly great but it works fine with my HD 4850 and my system is overclocked pretty good. Having a 12v rail you can dedicate to your video card is very important.

There are several good name brand PSUs out there in the 500W-600W range that would probably work well without costing too much.

Actually, multiple rails in general are a bad thing, as they are more susceptible to being overloaded by an uneven distribution of power than a single rail. However, many units labeled as having multiple rails really just have a single big rail internally.

Well here is a good resource:

http://jonnyguru.com/forums/showthread.php?t=3990

Multiple rails are more of a non-issue than being bad, but about everything out there has multiple 12v rails to safety distribute the current load.

The most important thing is to have enough amperage on the 12v, be it multi-rail or single.

 

[Julian1221]

Went out and bought a ocz stealthstream but didn't get enough time to diagnose why it wont turn on at all now. I had like 20 minutes after I came home to play with it before I had to go to class. I guess we will see this weekend

 

[Diogenes2]

Originally posted by: Quiksilver
Say you have 2x 12V rails at 18A each. Now let's see one device needs 12A and another device needs 24A. Sames each rail is only rated for 18A and one of them only is using 12A, would the power be diverted to the other rail and used for the other device, or would it be "trapped" as I said. :S
..........................

If it truly has separate rails, then there will only be 18A available on each rail..

Nothing will be ' trapped ' in the unused rail .. Electricity doesn't work like that ..

 

[Julian1221]

Got everything installed and it works great! thanks guys!

 

[40sTheme]

Originally posted by: DusterAZ
Yeah, I'd look at new PSU with dual 12v rails. It appears this has only one. I have an Ultra 500W w/ dual rails ... Ultra is not exactly great but it works fine with my HD 4850 and my system is overclocked pretty good. Having a 12v rail you can dedicate to your video card is very important.

There are several good name brand PSUs out there in the 500W-600W range that would probably work well without costing too much.

Ugh... please go to the power supplies forum and read the post about 12V rails. You DO NOT want multiple 12V rails...
Just get an Earthwatts 500W. Best PSU for the money.