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Multiple 12v rails? - Page 2

post #11 of 19
Quote:
Originally Posted by dragosmp View Post
First of all, 18A seems excessive, this is over 200W worth of power and the 6800 is nowhere near that value (maybe 13A - 150W).

Power delivery is like water pressure, here's an analogy: say you need 18gallons/second of water in a tank. You have two pipes, each providing a max of 13gl/s and 10gl/s. Both of them could supply the necesary 18, but taken individually neither can.

I suppose he also powers the processor and all the rig from this PSU, so the 10+13amps may not be all available. The manual of the PSU (probably you can find one online) says which connector is powered by which rail. The ATX connector probably takes 2A from a rail, the CPU some 4-6A (if not OCed, more if OCed) from the same or another rail, disks some 1-2A in total. You're still left with some 13A available which should be enough.
To pull those 13W I advise you to get an adapter that connects on two male connectors !one for each rail! and has one male PCIe connector to plug into the graphics card. It's a pretty complicated setup, but it should be doable.
...alternatively he could try finding a graphics card that doesn't need a 6-pin PCIe connector (5670/5570 DDR5 should be better than a 6800) or buy a PSU with a single beefier +12V rail.

Since the current computer has a 5700 Ultra, it's most likely an AGP setup, and if I recall correctly, any AGP 6800 GT would have a Molex connector.
post #12 of 19
Thread Starter 
Quote:
Originally Posted by SHNS0 View Post
Just to know... Why would you call a 7 years old card an upgrade?
I mean, for even 250$ you could certainly get something way better. And I mean 250$ for a whole PC, not a gpu
1: Because it's an old PC he wants to upgrade for about €100,- and I can get a 6800GT second hand for €30,-
2: The CPU is an Athlon 64 3000+ and something way faster would just be bottlenecked by the CPU and I'm not buying another one.
post #13 of 19
Thread Starter 
Quote:
Originally Posted by dragosmp View Post
Edit: Sorry mate but it doesn't work like that. It can be done, but you don't just add up rails like that. If he pulls 18A from a single 13A rail, it doesn't matter the second rail has 10A available, the PSU will be overloaded.

_____________
First of all, 18A seems excessive, this is over 200W worth of power and the 6800 is nowhere near that value (maybe 13A - 150W).

Power delivery is like water pressure, here's an analogy: say you need 18gallons/second of water in a tank. You have two pipes, each providing a max of 13gl/s and 10gl/s. Both of them could supply the necesary 18, but taken individually neither can.

I suppose he also powers the processor and all the rig from this PSU, so the 10+13amps may not be all available. The manual of the PSU (probably you can find one online) says which connector is powered by which rail. The ATX connector probably takes 2A from a rail, the CPU some 4-6A (if not OCed, more if OCed) from the same or another rail, disks some 1-2A in total. You're still left with some 13A available which should be enough.
To pull those 13W I advise you to get an adapter that connects on two male connectors !one for each rail! and has one male PCIe connector to plug into the graphics card. It's a pretty complicated setup, but it should be doable.
...alternatively he could try finding a graphics card that doesn't need a 6-pin PCIe connector (5670/5570 DDR5 should be better than a 6800) or buy a PSU with a single beefier +12V rail.
Oh, sorry.
I forgot to mention it's an AGP setup.
Also, I'm talking about an nVidia 6800GT. How did you get to the 5570/670?.
That's way faster (and more expensive).
Edited by xIntenso - 3/21/11 at 8:39am
post #14 of 19
Quote:
Originally Posted by Epona View Post
It's an AGP card...
Well I know that. Aside from the fact that the card's performance compared to modern cards is nothing, but I think that the major problem is actually getting one. I don't think that stores still sell it, and on the used side it will be rather difficult to find one that still works and/or will work for an amount of time that justifies the price.
I just don't see the point, sorry. I don't mean to be rude or a threadcrapper.
     
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post #15 of 19
Thread Starter 
Quote:
Originally Posted by Shub View Post
Since the current computer has a 5700 Ultra, it's most likely an AGP setup, and if I recall correctly, any AGP 6800 GT would have a Molex connector.
Correct. At least about the AGP.
I don't know about the connector, but I believe you
post #16 of 19
Thread Starter 
Quote:
Originally Posted by SHNS0 View Post
Well I know that. Aside from the fact that the card's performance compared to modern cards is nothing, but I think that the major problem is actually getting one. I don't think that stores still sell it, and on the used side it will be rather difficult to find one that still works and/or will work for an amount of time that justifies the price.
I just don't see the point, sorry. I don't mean to be rude or a threadcrapper.
I actually found about five here in the Netherlands (Which is where I live)
For more reasons, read post #12.
post #17 of 19
With that pc, I don't know if going to a 6800GT will be a major improvement... It will be difficult to play 5 year old games, let alone newer ones...
Honestly, I were your friend, I'd just wait and save a bit more money for a decent, modern pc. If I remember correctly, I used to have a pc like that some time ago and it would give me almost unplayable FPS on Star Wars Empire at War. The only use I could think of it would be basic web surfing and playing Pokemon on a DS emulator
I'm anyway sure that you guys might have a reason behind this, I'm just writing my opinion. And let's just hope that one of these cards will last long enough
     
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post #18 of 19
Quote:
Originally Posted by dragosmp View Post
Edit: Sorry mate but it doesn't work like that. It can be done, but you don't just add up rails like that. If he pulls 18A from a single 13A rail, it doesn't matter the second rail has 10A available, the PSU will be overloaded.
Erm.... You're telling me this because?....

The 6800GT isn't exactly a power hungry card.
Edited by GameBoy - 3/21/11 at 8:58am
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post #19 of 19
Quote:
Originally Posted by dragosmp View Post
Edit: Sorry mate but it doesn't work like that. It can be done, but you don't just add up rails like that. If he pulls 18A from a single 13A rail, it doesn't matter the second rail has 10A available, the PSU will be overloaded.
The BP units have the motherboard and CPU on one OCP circuit, the PCIe connectors on the other one, and the molex and SATA connectors divided about evenly between them. The 6800GT will draw power from both the AGP slot and from a molex connector. I don't know how much the 6800GT pulls (before my time and all that) but if somehow he trips the 13A OCP circuit, then he can just try a molex connector from a different connector, or a SATA to molex converter, and that will shift some of the load to the other OCP circuit.
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