Argghh! Bought a 9800 GX2 and it didn't come with an 8pin Adapter

[bamacre]

Damn these things should come with some kind of an adapter, as most PSU's don't have an 8pin power connector.

I looked at the Egg, they didn't seem to have a 6pin to 8pin power adapter. Anyone know where I could find this?

 

[Jephph]

http://www.performance-pcs.com...info&products_id=21721

 

[Jephph]

Can't you get an 8-pin PCI-Express to 4-pin Molex connector too?

 

[bamacre]

What about this one...?
http://www.bfgstore.com/Produc...uctCode=PCIXPRESPWREXT

I would think it to be safer to use a 6pin to 8pin adapter rather than two 4pin molex to 8pin adapter.

 

[imported_wired247]

the BFG one works just fine.

 

[JustaGeek]

Originally posted by: bamacre
What about this one...?
http://www.bfgstore.com/Produc...uctCode=PCIXPRESPWREXT

I would think it to be safer to use a 6pin to 8pin adapter rather than two 4pin molex to 8pin adapter.

I would rather get the 2xMolex to 8-pin than the 6 to 8 pin PCIe connector,

The molex will probably be more efficient in supply the enough power, especially if you go between 2 separate 12V rails.

The 6 to 8 has a disclaimer:

NOTE: Connector should not support more than 108W. The 8-pin connector does not support +12V sense function.

Even not knowing what it means, I would not take a chance with the ordinary 6 to 8 pin...

 

[DerekWilson]

Originally posted by: JustaGeek

Originally posted by: bamacre
What about this one...?
http://www.bfgstore.com/Produc...uctCode=PCIXPRESPWREXT

I would think it to be safer to use a 6pin to 8pin adapter rather than two 4pin molex to 8pin adapter.

I would rather get the 2xMolex to 8-pin than the 6 to 8 pin PCIe connector,

The molex will probably be more efficient in supply the enough power, especially if you go between 2 separate 12V rails.

The 6 to 8 has a disclaimer:

NOTE: Connector should not support more than 108W. The 8-pin connector does not support +12V sense function.

Even not knowing what it means, I would not take a chance with the ordinary 6 to 8 pin...

you don't want to run one card off multiple rails -- if you plug two rails into each other like that you end up connecting their common ... which can cause instability. i think that's part of why we are seeing the move to single 12v rail PSUs these days ...

using these kinds of converters is a little touchy some times. it may or may not work depending on PSU and system ... I wouldn't recommend it for things like SLI, but you can probably get away with it with most single card setups.

 

[jonnyGURU]

Originally posted by: JustaGeek
I would rather get the 2xMolex to 8-pin than the 6 to 8 pin PCIe connector,

The molex will probably be more efficient in supply the enough power, especially if you go between 2 separate 12V rails.

Actually, with a 2x Molex to 8-pin adapter you only have two +12V leads to the connector. At least with a 6-pin to 8-pin adapter you have three. That would make the Molex adapter LESS efficient.

Originally posted by: JustaGeek
The 6 to 8 has a disclaimer:

NOTE: Connector should not support more than 108W. The 8-pin connector does not support +12V sense function.

Even not knowing what it means, I would not take a chance with the ordinary 6 to 8 pin...

That's due to a mechanical limitation of the connector. Ignorance is bliss, but that doesn't make a Molex adapter any "safer". A Molex connector delivers even less power and is why graphics cards use PCIe connectors instead!

Originally posted by: DerekWilson
you don't want to run one card off multiple rails -- if you plug two rails into each other like that you end up connecting their common ... which can cause instability. i think that's part of why we are seeing the move to single 12v rail PSUs these days ...

Since all a multiple +12V rail PSU is is a single +12V rail split up and capped off with "limiters" that prevent too much current from going through the wire in the event of a short, the only thing that would happen by tapping one load off of two rails is you would essentially double your capacity... which is what the point of having two PCIe connectors is in the first place. There shouldn't be any "instability" caused by this.

Originally posted by: DerekWilson
using these kinds of converters is a little touchy some times. it may or may not work depending on PSU and system ... I wouldn't recommend it for things like SLI, but you can probably get away with it with most single card setups.

It would be more likely that a PCIe to PCIe type adapter would cause less problems than a Molex to PCIe adapter because when you DO have a PSU with multiple +12V rails, you typically have the PCIe connectors on their own rail (which is actually part of getting a PSU SLI certified these days) while the Molex is going to be on a rail with all of the other Molexes which are powering your drives, fans, lights, etc.