Bitcoin Forum

I'm trying to run quad 5970 xfire on MSI 890FXA-GD70 but unfortunately bought an ocz 1250watt psu that is 2 ports short. Am I doomed to have only triple xfire? Where can I get a psu that has 4x pcie slots?

Buy Molex converters. MUCH cheaper than a whole new PSU.

Great idea, I don't know why I forgot about those!

I use lots of those depending on the psu..

I even modify them so they only require 1 molex plug instead of two....


Brand new 7900 series AMD cards came with single plug 6pin PCI-E adapters so I figured I could mod all my dual plug ones :)

Modify them how for example?

if you look at the wires there are 2 sets that are identical yellow and black the brown wire is already going to the same spot in the 6pin connector..


I remove one molex plug and double up the yellow and black wires on the existing molex connector.... I can show you some pictures tomorrow if you would like.. I am just putting on a movie for the wife and I to watch.


Good night :)

I can't find a molex connector that fits this specific psu, because there are no molex ports. Do you have a recommendation?

Use SATA converters? What is the model number of the PSU?

Hack up the ATX motherboard connector from a dead PSU to make six pin connectors. Solder wires to existing supply. Do the math to not overload the rails.

Cost = 0BTC

I am not experienced with soldering and that sounds like a lot of work. I didn't put the model # because this is the ONLY PSU that OCZ makes that is 1250watt, but this it http://www.ocztechnology.com/ocz-zx-series-1250w-power-supply.html

I'm going to try this I think? http://images2.monoprice.com/productmediumimages/84941.jpg

Don't use Sata it runs off 3.3v I believe.

You should have molex connectors, any PSU comes with molex nowadays

The one I linked does not. If so please point me in the right direction.

You can add alternate power. There are supplementary PSUs for such things (without the mainboard connector) or you could just use another PSU (I have done that before when adding hard-drives caused my main PSU to shut down due to drawing too much power to tide me over until I got a more capable main PSU). I have also used a 12V supply for a IDE/SATA to USB adapter to power an internal hard-drive in a pinch.

This is slightly risky in that if your voltages are slightly off, you could theoretically end up having too much current flow where it should not but that has never been an issue for me.

Here is one pulled at random from google. Not recommending, no association, etc.

http://www.cputopia.com/fsp-group-booster-x5.html?utm_source=googlepepla&utm_medium=adwords&id=20206522684&utm_content=pla&gclid=CKuR--TJxLICFQQ4nAodgkIA_w

Why don't molex connectors work for this PSU? Still have a card here sitting on my table waiting for a workable response. I'm not paying 89 bucks for a "supplemental psu."

Just get the worst PSU u can find, it should have the watt/amp output to power two of the cards then u can leave the others on the main card.

Do you have an example of this at work? I don't feel good about using 2 different PSUs at the same time.

Molex connectors will work fine.
Alternatively, buy some pci-e power splitters.

NO THEY WONT. Is no one looking at the connections on this PSU? I HAVE MOLEX CONNECTORS and they don't fit!

Flip them over.

Is this the supply your using
http://www.ocztechnology.com/ocz-zx-series-1250w-power-supply.html (http://www.ocztechnology.com/ocz-zx-series-1250w-power-supply.html)

I would be careful using molex to PCI-E power. That is an awful lot of power to be supplied from a single wire (you're essentually splitting 12v power from 1 dinky wire into 2 or 3 depending on the adapter. Most are two). I like to stick to PCI-E power splitter adapters since you're drawing from THREE 12v wires and you have an extra ground compared to molex's 2 grounds.

http://www.newegg.com/Product/Product.aspx?Item=N82E16812198018

I have 16 of these and I love them. It takes in a 6 pin PCI-E power connector and gives you 2 6+2 pin PCI-E power. They're awesome.

I'm pretty sure that won't work because my PSU (google "ocz" 1250watt") has 8 pin pcie slots and not six.

What about this? http://www.amazon.com/CableHero-8-Pin-PCI-Express-Adapter-Y-Splitter/dp/B0021ZQK6A

It works just fine with 6+2 pin. If your power supply is stricty supplying 8 pin PCI-E power (no breakaway 2 pin ground) then it's probably a bad power supply with no foresight. My rosewill capstone 450 watt comes with 2 6+2 pin PCI-E power plugs, and I use 2 of those splitters to give me 4 6+2 plugs so I can power 2 radeon 5870's.

The extra 2 pins are just grounds, and almost all power supplies just piggy back those 2 grounds onto the existing 3 grounds of a 6 pin PCI-E power plug. It's safe.