mobo not recognizing VisionTek HD 7870

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OneAndDoneLove

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Jun 12, 2013
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10,510
I have read dozens of this same post which is discerning and if I can't figure this out soon I'm just gonna get a gtx 660 or something but here is the issue... My motherboard is not recognizing the new 7870 at all, onboard works, I have uninstalled the drivers for the graphics card in the attempt to install them but it won't detect the hardward to install CCC/drivers, only the CIM is installed on my pc.

I have already attempted reseating the card and have even flashed my BIOS to the newer 2.80 version of the UEFI BIOS. I currently have 1 6-pin connector plugged into it although the card has two 6-pin connectors (I tried filling both also with the splitters that came with the card but no luck there).

lastly I have not checked my other PCI-e lane but that is because I have my previous 5870 and it worked before I tried this card, and still works in that lane.

I am looking for help to see if the issue is my PSU, the card itself, or mobo compatability (although according to what I have read so far mobo isn't the problem)


Specs:

i7 3770K
VisionTek HD 7870 GHz edition
16g mem (8g G.SKILL Ripjaws X Series (4g dims), 8g something else sorry can't remember off the top of my head)
ASROCK z77 Extreme4 LGA 1155 mobo
Earthwatts Antec 650(may be 600) PSU (link: http://www.amazon.com/Antec-EarthWatts-EA650-Power-Supply/dp/B000HEZFZO/ref=pd_sxp_f_pt)

I can confirm all of this when I get home round 5:15 so discussion is great till then.

THANKS IN ADVANCE I APPRECIATE ANY HELP!!!!!!!!!
 
Solution
markwp
You have to populate both PEG connectors on the gpu, otherwise it will not be recognized.

Edit: The 650 has two 6+2 connectors - use those and not the splitters.

Mark
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OneAndDoneLove

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Jun 12, 2013
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Question, I cannot find another free 6 pin connector on my PSU so if I use one normal 6-Pin and one of the splitters will that be fine? I was assuming the other slot was for crossfire adapter...

UPDATE: I also wrote that I had both connectors filled earlier, this was before the BIOS update however.

 
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OneAndDoneLove

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Jun 12, 2013
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I have seen the 6+2 cable but was simply afraid to use it (first PC I built 2 years ago upgrading now) I suppose that will work fine then? Also the bios is set to PCI(at least it was before the update I will check again but the new deal was that I could select speeds like Gen 2 and 3... would these settings help you think?)

Thanks for the input by the way I have been looking EVERYWHERE for someone to mention if both slots need filled for power on the card, because the fan spins both ways.
 
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markwp

markwp

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Jan 22, 2013
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The connectors will be on separate lines. Your psu has two 12v rails and one connector is attached to each. They are set up as 6+2 because some gpu's require a 6 and an 8 or an 8 and an 8, or like your a 6 and a 6. If the extra two pins are not needed, just ignore that part of the connector.

Mark
 
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OneAndDoneLove

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Jun 12, 2013
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10,510


cool, thanks. I will try these ideas out when I get home.

 
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OneAndDoneLove

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Jun 12, 2013
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worked like a charm, the instructions that came with it weren't even fro a card that had two connectors.... Wasn't sure how to do it and AMD's site says one if I recall.

THANK YOU SO MUCH lol
 
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