Solved which pcie express connector?

April 9, 2012 at 09:27:05
Specs: Windows 7, i7 3960x 4.4 ghz,g.skill 8x8gb
hi,
i have four xfx 7970 cards and a silverstone 1.5kw psu...the cards connect to the psu smoothly as the psu has all te connectors..but the prob is my mobo..its the asus rampage 4 extreme and it needs a 6pin pcie connector to power the pcie ports i think..so i need an extra 6pin pcie connector....so will this connector work?
http://www.amazon.com/Express-6-Pin...

or do i need any other kind of connector?
and do i need to connect the molex connectors in a special way like horizontally or diagonally to the psu as the psu has 2 lines of molex conectors?

thnx in advance
mukit


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✔ Best Answer
April 10, 2012 at 16:01:15
"the 1500 watts they claim to produce is divided into 8 feeds. Each feed can only supply 25A@12V which equals 300W"

Hmmm, 8 feeds at 300W each = 2400W. How is that possible with a 1500W PSU? Very simple, it's NOT. Look at the side of the PSU - "max +12v combined load 110A".

Regardless, that PSU will handle anything you throw at it. Why you feel you need a 4-way crossfire setup is beyond me, but I see no reason why it won't work with that 6-pin adapter.



#1
April 9, 2012 at 12:07:12
Got this from your manual

EZ Plug connectors (6-pin EZ_PLUG_1; 4-pin EZ_PLUG_2)
The EZ Plug connectors provide additional power to the memory modules and PCI Express 3.0 x16 slots. Connect a 6-pin power cable to EZ_PLUG_1 when installing four PCIe3.0 x16 display cards to provide sufficient power supply. Connect a 4-pin power cable to EZ_PLUG_2 to provide stable power supply to the DIMMs.

Look like you need a 4 pin floppy type connector for your ram, and 6 pin connector for your PCIe cards.

So yes that is the correct adapter that you will need to purchase.

BTW: sweet board! kind of jel


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#2
April 9, 2012 at 21:15:46
Yes the adapter should work, just use Molex connectors on two different wire bundle sets to ensure sufficient 12volt power to the 6pin connector.

You have to be a little bit crazy to keep you from going insane.


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#3
April 10, 2012 at 05:29:00
If the link below is for your power supply then you may have a problem. That PSU has 7 +12V rails but each only is rated for 25A. The XFX 7970 can pull more power than that so under full load you will be exceeding the output of those rails.

http://www.newegg.com/Product/Produ...

Looks like the 2 PSUs linked below would work.

http://www.newegg.com/Product/Produ...

http://www.newegg.com/Product/Produ...

See the last link below. This review has take actual measurements of the system with and without the XFX installed. Divide the net wattage by 12 to get the Amps per card. You also need to power the CPU and all other 12V hardware.

I personally think you have too much cash to spend but I guess for a while you WILL have bragging rights.

http://hardocp.com/article/2012/01/...


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Related Solutions

#4
April 10, 2012 at 09:34:03
what do you mean by that?

i am a noob with electricity and stuff...wont i be able to use the molex to pcie on the silverstone 1.5kw psu?:(


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#5
April 10, 2012 at 09:36:09
different sets?what does that mean?

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#6
April 10, 2012 at 09:54:16
What do you mean "different sets"?

The Silverstone power supply you listed has 8 +12V rails.

So the 1500 watts they claim to produce is divided into 8 feeds. Each feed can only supply 25A@12V which equals 300W.

Your Graphics cards can pull 315W@+12V. That exceeds the capabilities of each of the Silverstone's +12V rails. That doesn't even take into account any inefficiencies in the power supply.

If I understand your hardware you are going to run 4-XFX7970 cards. Each of those cards can draw up to 315W. Then your processor can pull up to 130W. Add hard drives and memory requirements and you are getting up to around 1400W/1500W.

All that 1400/1500W must be available for use. The Silverstone can't do it.


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#7
April 10, 2012 at 10:18:38
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa!!!!!!!!!
:'(
i thought it was the psu...
i guess my whole rig will be destroyed

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#8
April 10, 2012 at 10:32:53
The only time the power supply will be stressed is when all the Graphic cards are in full load. I am not sure that is possible, but I thought I should point that out.

Is this rig up and running now?


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#9
April 10, 2012 at 16:01:15
✔ Best Answer
"the 1500 watts they claim to produce is divided into 8 feeds. Each feed can only supply 25A@12V which equals 300W"

Hmmm, 8 feeds at 300W each = 2400W. How is that possible with a 1500W PSU? Very simple, it's NOT. Look at the side of the PSU - "max +12v combined load 110A".

Regardless, that PSU will handle anything you throw at it. Why you feel you need a 4-way crossfire setup is beyond me, but I see no reason why it won't work with that 6-pin adapter.


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#10
April 11, 2012 at 07:14:03
@riider

are you 100% sure?


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#11
April 11, 2012 at 09:30:34
abdull

As I stated above the issue would only be apparent if all your graphics cards were actually under full load. I don't know enough about 4 way crossfire to say if that will happen or not.

If you read the links in my first response you see the XFXR7970 only draws 25W at idle but can draw as much as 315W under full load. Even under full load the Enermax linked above and below should be able to keep up with the demands. It is rated at 1475W.

If you can exchange the power supply the unit linked below would be a better choice with less chance of anything happening. You may still need to use an adapter. There are motherboard power connectors provided but they may not be 6 pin but 4 or 8 pin.

Below are 2 additional links to Silverstone. The first is to the specs. The second is to a list of supported GPUs (graphics cards). You will note that PSU only supports 3 of your cards.

http://www.silverstonetek.com/produ...

http://www.silverstonetek.com/downl...

I recommend you consider the Thermaltake linked below. There is a discount promotion that ends today. Really a good price for a superior PSU.

http://www.newegg.com/Product/Produ...

From your other recent post I see you deal with newegg.com. If you bought the Silverstone from them I think they would exchange it.


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