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Two 6870s with Hyper Transport Error


I am really stuck on this one. I recently got my hands on a second 6870 and I am trying to get it to work with my computer. However as you can guess by the title I get crashes once I get into windows and BIOS reports a hyper transport error. I am no professional when it comes to overclocking and have a very limited understanding of things like busses and northbridges (I am a software dev). I have tried bumping up the voltages of ram and other things in m BIOS but nothing seems to help. The closest I got was bumping my RAM voltage up to 1.59 from 1.5 in which case it lasted about 5 minutes before crashing.
I am completely lost as far as what to do and I have read hundreds of threads and tried various suggestions. I did have another graphics card in there once upon a time which was not as powerful and it ran fine.

I should also note that while I have two 6870s one is made by visiontek and the other is xfx. They are not crossfired (I don't even know how to do this yet). Also I had to get two 6pin splitters because my psu only had two

Ram: DDR3 RAM - PC10666, 1333MHz, 4x 4GB (1.6V)
Cpu: AMD Phenom II X4 965 Black Edition Deneb 3.4GHz (125W)
PSU: (700W)

Does anyone have and suggestions for me on how to fix this? I hate to thing I bought this card for nothing.

Thank you so much!
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  1. Best answer
    Does it work with one card? HT error is a motherboard problem so my suspicion goes against your substandard PSU dropping voltage out of spec when loaded.
  2. Yea I ran a 6870 (xfx) along with a geforce 9500 gt no problem. Only encountered this issue when I replaced the latter with a 6870
  3. Check your PSU voltages, it can as well be that you are overloading one of the +12 volt rails so swapping connectors might work.
  4. I'm going with bad PSU. That thing is total junk and should be replaced. Little red voltage select switch, ~575W on the 12V rails (it claims) and only two 6pin PCIe plugs. My 500W PSU had two plugs. If it could really do 575 it should have a lot more, or 6+2 plugs.

    125W CPU + 2x150W GPUs + 50W for board and stuff = 475W. I'm guessing your PSU can't even really do that. It could also be a HT error, more so if you are doing any OCing. But that PSU needs to go.
  5. voltages are within spec, swapped two connectors and still got a crash

    Edit: Guess I will order a new psu, recommendations?
  6. Antec, Corsair, Seasonic, XFX, OCZ to name few if you want 4 x PCIe connectors
  7. What wattage should I shoot for? 650+?
  8. 650watt is what I would get minimum (like the XFX I linked) but if you jump up to 750watt most of them have 4 x PCIe power.
  9. Great thank you all so much! I'll be back if I still have issues :)
  10. Best answer selected by crasx.
  11. This topic has been closed by Mousemonkey
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