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2x AMD 7950 with a OCZ GXS 850 (just two PCIe 6 pins) Will the cards work at a full hashrate?

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  • OCZ
  • AMD
  • Power
  • Systems
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January 13, 2014 3:09:56 PM

I need some help, I want to build a mining rig for LTC (litecoin)

2x AMD 7950 with a OCZ GXS 850 (just two PCIe 6 pins) Will the cards work at a full hashrate?
And a side question, will the card run fine, using a 1x to 16x riser cable?

1 x PCIe 2.0 x16
2 x PCIe 2.0 x1
3 x PCI

And my PSU (OCZ GXS 850) Has just two PCIe power cables?
1x 24-pin main ATX
2x PCI-Express
1x 4-pin/8-pin CPU
2x 4-pin floppy drive
6x 4-pin peropheral
6x SATA


If anyone can help me out, I would be very happy.
Additional Details
The PSU and Board
http://www.ocztechnology.com/ocz-gamexstream-850w-power...
http://www.asus.com/Motherboards/M5A78L_LE/#specificati...


And the graphix cards
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

More about : amd 7950 ocz gxs 850 pcie pins cards work full hashrate

a c 723 ) Power supply
a c 373 À AMD
January 13, 2014 3:12:37 PM

That PSU is plenty and you have 2 x 6 pin and 2 x 6+2 which you use the 6 part of so no problem powering two cards!
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January 13, 2014 3:15:36 PM

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January 13, 2014 3:18:27 PM

rolli59 said:
That PSU is plenty and you have 2 x 6 pin and 2 x 6+2 which you use the 6 part of so no problem powering two cards!


Strange, I never found the 2x 6+2 pin ?! Im running my old GTX 550 TI now in that machine, with just 1 PCIe 6 pin connected and saw one more PCIe 6 pin .
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a c 723 ) Power supply
a c 373 À AMD
January 13, 2014 3:22:44 PM

It is listed in your link under the specs!
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January 13, 2014 3:25:31 PM

rolli59 said:
It is listed in your link under the specs!


I looked it up and my PSU sais exactly OCZ GXS 850, could it be that there are two versions? since this psu is bought 2 years ago? Otherwise I will check it tomorrow. Going to sleep now, thanks for the answer!
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a c 723 ) Power supply
a c 373 À AMD
January 13, 2014 6:11:00 PM

Normally units that have 750watts and more (apart from a few crap units that are over rated) have 4 or more connectors.
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January 14, 2014 4:40:21 AM

rolli59 said:
Normally units that have 750watts and more (apart from a few crap units that are over rated) have 4 or more connectors.


I am wondering what PSU do I have?
I post a photo of the information found on it.
What I found was this:
1 motherboard cable pack :p  ATX
2 PCIe
6 SATA
1 split cable into 2x 4pin to power my processor?
And a bunch of random cables to power DVD Floppy maybe a fan?



If I can count the PCIe connector can provide 150W in stead of the usual 75W? Or where eould the 850W otherwise go if I can only hook up 1 videocard?
Just to check before i buy 2x a 7950 XFX and I find out that they will run at way to low hash rates or something like that.
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a c 723 ) Power supply
a c 373 À AMD
January 14, 2014 6:03:44 AM

That is strange since the OCZ link shows exactly the same sticker with two +12 volt rails dedicated to PCIe with 20amps which is 240watt way more than a single connector can handle. http://www.ocztechnology.com/res/manuals/OCZ850GXSSLI.p...
You can always use Molex to PCIe adapters for the second connection if you can not find the cables!
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January 14, 2014 6:19:53 AM

rolli59 said:
That is strange since the OCZ link shows exactly the same sticker with two +12 volt rails dedicated to PCIe with 20amps which is 240watt way more than a single connector can handle. http://www.ocztechnology.com/res/manuals/OCZ850GXSSLI.p...
You can always use Molex to PCIe adapters for the second connection if you can not find the cables!


Hmm or a Molex PCIe 1x to 16x riser, one last and maybe most silly question. Where can I find the Molex connectors? Are they comming from my PSU or my Motherboard? Asus M5A78L_LE? I was not able to get that clear after reading some threads.
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Best solution

a c 723 ) Power supply
a c 373 À AMD
January 14, 2014 6:29:37 AM

renekton said:
rolli59 said:
That is strange since the OCZ link shows exactly the same sticker with two +12 volt rails dedicated to PCIe with 20amps which is 240watt way more than a single connector can handle. http://www.ocztechnology.com/res/manuals/OCZ850GXSSLI.p...
You can always use Molex to PCIe adapters for the second connection if you can not find the cables!


Hmm or a Molex PCIe 1x to 16x riser, one last and maybe most silly question. Where can I find the Molex connectors? Are they comming from my PSU or my Motherboard? Asus M5A78L_LE? I was not able to get that clear after reading some threads.


Often the 4 pin Molex or peripheral adapter comes with the card and connects between card and PSU. http://www.newegg.com/Product/Product.aspx?Item=N82E168...
I am not sure the second card will work well on the riser card so maybe a better motherboard is a better solution.
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January 14, 2014 6:35:41 AM

rolli59 said:
renekton said:
rolli59 said:
That is strange since the OCZ link shows exactly the same sticker with two +12 volt rails dedicated to PCIe with 20amps which is 240watt way more than a single connector can handle. http://www.ocztechnology.com/res/manuals/OCZ850GXSSLI.p...
You can always use Molex to PCIe adapters for the second connection if you can not find the cables!


Hmm or a Molex PCIe 1x to 16x riser, one last and maybe most silly question. Where can I find the Molex connectors? Are they comming from my PSU or my Motherboard? Asus M5A78L_LE? I was not able to get that clear after reading some threads.


Often the 4 pin Molex or peripheral adapter comes with the card and connects between card and PSU. http://www.newegg.com/Product/Product.aspx?Item=N82E168...
I am not sure the second card will work well on the riser card so maybe a better motherboard is a better solution.


Thanks for the answer, I am just stupid. I know what a molex connector is, but I am not used to the name :)  i saw them today :p  a riser card 1x to 16x will work fine for mining. You can even stick a 1x to 16x riser in a 16x motherboard PCIe slot and there will be not any diff (for mining). Mining doesnt require a big load of Memory to be used, just brutal processor force. That is why AMD overrules Nvida, and the reason that we can make special mining chips is the same :)  just a stupid fast calculation times 10000000x to get a coin rewarded. Thanks for all the answers, I will PM you when my miner is finished.
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