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post #11 of 25
I think it's the PSU, 450W can't handle a PD and a 4850 at the same time, at least a 500W PSU
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post #12 of 25
Thread Starter 
Quote:
Originally Posted by dralb View Post
It shouldn't matter. How do you know what rails are what? Just because there is more than one harness with molexes on them coming out of the PSU, that doesn't mean they are on 2 seperate rails. Most multiple rail PSU's do not actuall have multiple rails.
well not too sure bout psu, so I just connect both ends of the 6pin adapter to any open molex? Well If thats so I guess I've been doing so.

Edit: yea I know posted a topic here asking if there would be a bottleneck, some said a slight one,anyway the 10-15mins of crysis that I got on High seems smooth, I guess if it can't shine, I'll settle for a "glow"

Really need confirmation if its my psu, anyway for me to eliminate other factors so I can pinpiont what is the cause for the shutdown?
Edited by animemaniac - 7/5/08 at 11:34am
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post #13 of 25
Quote:
Originally Posted by animemaniac View Post
@ qus 1 : not sure as it was a cheapo psu I got 3years back
qus 2:no I think I'm the only OC/PC nerd amoung them
qus 3: yes unistalled nividia drivers, ran DCP twice in safe mode
qus 4:no but it is a pretty clean install as I didn't use it oth than for gaming/ using Mac OSX
Try swapping PSU's with one of your friends and see if it helps. The other thing is a format re-install. Usually when you switch between ATi and nVidia cards, it's a good time to format/reinstall.
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post #14 of 25
Quote:
Originally Posted by animemaniac View Post
well not too sure bout psu, so I just connect both ends of the 6pin adapter to any open molex? Well If thats so I guess I've been doing so.

Really need confirmation if its my psu, anyway for me to eliminate other factors so I can pinpiont what is the cause for the shutdown?
What you need to do is figure out the amps per rail of that PSU and see what else you have running and add them up. I am not the best guy for PSU diag (see johhnyguru) I would think it is not quite enough, but again, watts isn't everything. There should be a sticker on the PSU that states the specs. If you and post those along with what you have running, someone should be able to see if it is indeed trying to draw too much.
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post #15 of 25
Thread Starter 
Quote:
Originally Posted by FearSC549 View Post
I think it's the PSU, 450W can't handle a PD and a 4850 at the same time, at least a 500W PSU
yep I'm guess so. A few have said it on another forum, just need to be really sure that it is a PSu problem as after getting the 4850, I'm really tight on cash.
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post #16 of 25
Quote:
Originally Posted by animemaniac View Post
yep I'm guess so. A few have said it on another forum, just need to be really sure that it is a PSu problem as after getting the 4850, I'm really tight on cash.
From googling that PSU, it doesn't look very good. I can't seem to find the amperage specs or a pic of the sticker on the side.


edit: :What are you running besides the 2 hdds, 4 sticks of RAM etc.?
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post #17 of 25
Thread Starter 
Quote:
Originally Posted by dralb View Post
What you need to do is figure out the amps per rail of that PSU and see what else you have running and add them up. I am not the best guy for PSU diag (see johhnyguru) I would think it is not quite enough, but again, watts isn't everything. There should be a sticker on the PSU that states the specs. If you and post those along with what you have running, someone should be able to see if it is indeed trying to draw too much.
yep on the sticker....=.= under the +12v:18.5A / -12V:0.8A

are those what u need...18 seems terrible.
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post #18 of 25
Thread Starter 
Quote:
Originally Posted by dralb View Post
From googling that PSU, it doesn't look very good. I can't seem to find the amperage specs or a pic of the sticker on the side.


edit: :What are you running besides the 2 hdds, 4 sticks of RAM etc.?
I took off all usb devices but the keyboard and mouse. running with only 1 pci-usb card,1 harddisk, thats all but still recieved the shutdown.
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post #19 of 25
Quote:
Originally Posted by animemaniac View Post
I took off all usb devices but the keyboard and mouse. running with only 1 pci-usb card,1 harddisk, thats all but still recieved the shutdown.
That doesn't seem too bad. (also, 450W/12v=37.50A, 37.50A/2=18.75A per rail) Now, i am also pretty sure that 18A is the max draw per rail, but that may not be what is available all the time. I would start a new thread in PSU's section and see what some of the more knowlegable PSU people think. It can get quite confusing between what is listed as available and what is actually there. Since you are running 2 hdds, one optical (assuming), 4 sticks of ram, PCI card, GFX card, fans, CPU etc., I can easily see that PSU getting taxed pretty heavily. PSU's are one of the mroe overlooked things in a system, but are by far one of the most important.
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post #20 of 25
EDIT: Jury's out. Could be the PSU, might not be.

Twin 18A rails should be enough to hold an overclock Pentium D and a HD4850 but it depends on the make up of the PSU and how it distributes it's power.

Amps x Voltage = Watts
18A x 12V = 216W. 216W x 2 rails = 432W on 12V rails. If they're telling the truth then that leaves a puny 18W for the 3.3 and 5v rails. What that means is that they won't be true 18A rails and will be less, possibly causing the problem.

Like other's have said, try a friend's PSU or do a reformat before spending any money.

drabl, it's never a good idea to start PSU calculations of the manufacturers stated wattage. Most cheap PSU's lie about their wattage to the point that they're dangerous. Q-Tec, EZ-Cool, and ColorsIT are all (UK?) examples of bad PSU's.
Edited by Lyctus - 7/5/08 at 12:26pm
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