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post #11 of 18
24A @ 12V = 288W. That's more like what a whole computer uses. A 9800gtx will draw nowhere near that. My research shows that a 9800gtx will use ~108W during 3dmark06 and possibly a little more depending on the game. And even if the label says its 18A per rail they are rarely set at that, it's usually set at least a few amps above that (but that is not a relevant topic to this thread). On top of that a graphics card will draw up to 75W from the PCI-E slot which is on a different rail.
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post #12 of 18
Quote:
Originally Posted by shinji2k View Post
24A @ 12V = 288W. That's more like what a whole computer uses. A 9800gtx will draw nowhere near that. My research shows that a 9800gtx will use ~108W during 3dmark06 and possibly a little more depending on the game. And even if the label says its 18A per rail they are rarely set at that, it's usually set at least a few amps above that (but that is not a relevant topic to this thread). On top of that a graphics card will draw up to 75W from the PCI-E slot which is on a different rail.
Hmmm well as I said i'm not sure on this one. According to nvidia forums, it specifies it needs a 24amp rail on a 450W power supply.

And according to the picture of the actual power supply he has it says it can only output 18. Since he is having issues, and the 9800 is reccomended by the people who produce it to have a 24amp rail on it, that would be the first place I would look.

I do agree that 288 doesnt sound right but I'm just going by whats on the box. They know their products better than any of us, so I'd atleast try out a different PSU if you can get your hands on one. (if your pc is BSODing or locking up or shutting down, not if your getting driver errors)
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post #13 of 18
Quote:
Originally Posted by SLI_Maniac View Post
Hmmm well as I said i'm not sure on this one. According to nvidia forums, it specifies it needs a 24amp rail on a 450W power supply.

And according to the picture of the actual power supply he has it says it can only output 18. Since he is having issues, and the 9800 is reccomended by the people who produce it to have a 24amp rail on it, that would be the first place I would look.

I do agree that 288 doesnt sound right but I'm just going by whats on the box. They know their products better than any of us, so I'd atleast try out a different PSU if you can get your hands on one. (if your pc is BSODing or locking up or shutting down, not if your getting driver errors)
That 450W and 24A is the minimum for the whole computer. I would also like to see where it says a 24A rail is needed, not total capacity for the computer. Recommended minimum PSU requirements have always been for the whole computer.

edit: Here's another little tidbit. The OCP for the rails on the 700W are set for 22-24A, not 18A: http://www.hardwaresecrets.com/article/556/8
Edited by shinji2k - 12/26/08 at 7:46am
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post #14 of 18
Quote:
Originally Posted by shinji2k View Post
That 450W and 24A is the minimum for the whole computer. I would also like to see where it says a 24A rail is needed, not total capacity for the computer. Recommended minimum PSU requirements have always been for the whole computer.

edit: Here's another little tidbit. The OCP for the rails on the 700W are set for 22-24A, not 18A: http://www.hardwaresecrets.com/article/556/8
Are you suggesting he isn't using the whole computer?

This argument is going off topic without more info from the OP though. Gotta know what happens when his computer is having issues during games to have a better guess at whats going on.

BTW they totally had to OC that PSU to get that kind of a draw off of it

But yes its true they mark it under what real power it will put out, but thats to save them from lawsuits when someone overloads the specs that they put on it. They cant give you a maximum on every PSU simply because they all turn out different but over the 18amp mark for sure. some will reach 24 like that one did and some will only reach 22 or 20. Just like some graphics cards will OC like mad and then someone with the same model can only get half of what someone else got.
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post #15 of 18
Quote:
Originally Posted by SLI_Maniac View Post
Are you suggesting he isn't using the whole computer?
Huh? Nvidia suggests atleast 24A on the 12V and I demonstrated that the 9800gtx will rarely even go above 10A. That means the 9800gtx does not need 24A on one rail to run, but combined for the entire system.
Quote:
Originally Posted by SLI_Maniac View Post
But yes its true they mark it under what real power it will put out, but thats to save them from lawsuits when someone overloads the specs that they put on it. They cant give you a maximum on every PSU simply because they all turn out different but over the 18amp mark for sure. some will reach 24 like that one did and some will only reach 22 or 20. Just like some graphics cards will OC like mad and then someone with the same model can only get half of what someone else got.
That also doesn't make much sense to me. I would consider it to be false advertising if it isn't set to what the label says. I know why they do it, they don't want someone pulling 19A for a fraction of a second and then the PSU shuts down. But the further they stray from ~20A per rail as the ATX specs recommends, the less of a point there is to even have OCP. There also shouldn't be much variation between OCP circuits, at least not enough for one OCP to shut down at 18A and one of the same model to shut down at 24A. That's some pretty poor quality control. But this is getting way off topic as do many of my conversations since I'm always trying to correct people . Maybe I shouldn't bother anymore.
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post #16 of 18
Quote:
Originally Posted by shinji2k View Post
Huh? Nvidia suggests atleast 24A on the 12V and I demonstrated that the 9800gtx will rarely even go above 10A. That means the 9800gtx does not need 24A on one rail to run, but combined for the entire system.

That also doesn't make much sense to me. I would consider it to be false advertising if it isn't set to what the label says.
Lol did you look at the picture? it did say 18amps on the 12v didnt it? And didnt you just correct me by saying its actually at 22 or 24? So isnt that false advertising in itself?
Quote:
That's some pretty poor quality control. But this is getting way off topic as do many of my conversations since I'm always trying to correct people . Maybe I shouldn't bother anymore.
Lol just realized your about an hour away from where I am right now (wilmington). Lets settle this like men shall we? BATTLE ROYALE!!!! lol

Nah but your right getting way off topic. Gonna drop it till we get a little more from the OP.
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post #17 of 18
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So far i have not had any bsod or anything one of my games crashes to desktop but i think that its driver related. so far no problems. Do you its safe to stay with this psu?
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post #18 of 18
As long as you treat it like the 550W PSU it is, it does perform decently. I can't really tell you to junk it and get a new PSU but you could have gotten so much more PSU for the ~$150 you spent on it.
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