8Pin PCI-E connector

[OnDborder]

What's a good psu with a couple of these connectors?
Looking in the 750-900 watt range.
Or would one of those adapters work on a 6pin pci-e?

[mpilchfamily]

What do you need the 8 pin for?

Most top quality 700W and larger PSUs have at least 1 8 pin PCI-e. I only know of 1 card that uses the 8 pin and thats just to enable extra features on the card. Those features can be unlocked with a simple paper clip mod.

But here is a great qualtiy 750W unit with the connectors you need.
http://www.newegg.com/Product/Produc...82E16817139006

[OnDborder]

I was planning on getting a hd3870x2, which requires a 8pin pci-e and a 6 pin..
My Silverstone's(zeus 750 and 850) do not have the 8 pin . Total bummer. But at the time who'd thought I'd need one??

Would one of these adapters do the trick? http://www.performance-pcs.com/catal...ducts_id=21721
http://www.frozencpu.com/products/60...ter_Cable.html

[mpilchfamily]

Yeah those would work fine.

[OnDborder]

http://www.hardwarecanucks.com/forum...review-13.html
I plan on oc'ing.. That's why I'm concerned about the power input to the card. If I have to buy a psu also,, I'll put my 450bux to other uses..

[Zap]

Originally Posted by OnDborder

Would one of these adapters do the trick? http://www.performance-pcs.com/catal...ducts_id=21721
http://www.frozencpu.com/products/60...ter_Cable.html

Cheaper here:

http://www.bfgstore.com/ProductDetai...PCIXPRESPWREXT

[jonnyGURU]

Wow. About half the price. Maybe we should raise it!

[OnDborder]

So judging Jonny's positive reply, these will work as good as the separate 8 pin's?

[jonnyGURU]

Technically the 8-pin connector CAN NOT deliver more power, nor should it have to since the card is consuming a good deal less than the capability of the wires and connector.

8-pin generally has an extra pin on the +12V row to "sense" +12V voltage. If voltage drops due to the resistance caused by too much current, the PSU should be able to compensate and/or the graphics card can "clock down" to lighten the load.

But I can't think of any 8-pin PCIe connectors that actually USE the +12V sense. Everyone just taps a ground to the +12V sense pin which "fools" the graphics card into thinking that there's a +12V sense wire there.

The adapter will add resistance, but no more than if you had a modular power supply to begin with. So I wouldn't sweat it.

[DuckieHo]

Everyone missed an important point.... he wants to run two HD3870. Those cards need only a single 6-pin PCIe plug each. The 8-pin PCIe was for the HD29xx series.