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Seems to be working fine with 2nd monitor attached.. so I don't need the dummy card... next issue been getting recently only one card at a time connecting to the pool...
error messages from console....
No more backup pools left. Using primary and starting over 2011-07-08 02:06:40: Listener for "xxxxxx": 08/07/2011 02:06:40, Problems communicating with bitcoin RPC 0 2 2011-07-08 02:06:46: Listener for "xxxxxx": 08/07/2011 02:06:46, Problems communicating with bitcoin RPC 1 2 2011-07-08 02:06:52: Listener for "xxxxxx": 08/07/2011 02:06:52, Problems communicating with bitcoin RPC 2 2 2011-07-08 02:06:58: Listener for "xxxxxx": 08/07/2011 02:06:58, Problems communicating with bitcoin RPC 3 2
connecting to slush pool.. not sure what the scoop here is.. not sure if something on the pool side or not.
After watching it more they both seems to be dropping in and out at times.. I'm guessing this is on the server side and why people have accounts at multiple pools so when one 'dies' it will roll over and start mining at another pool that it can connect to.
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All is well now.. definitely had to have a 2nd monitor attached.. stopped by 'Worst Buy' and picked up a DVI-VGA adapter, dug up an old dell 17" fp. Soon as I hooked that up all was well.. Both cards show up in GUIMiner, and both 6950's mine 330 Mhash plus with little overclock.. (additional shaders not unlocked). Crossfire cable is installed and cross fire is running so it seems that crossfire doesn't make any difference whether it's turned on or not in my case. Btw.. Radio Shack didn't have any electronic components... I've always wondered how that place stays in business with that business model.. everything they have there is crap (always has been).. and even if I did want to build my own Ham radio from scratch they don't have any electronic components anyway, LOL. Also I've noticed that even 'Worst Buy' seems to carry less and less computer supplies. Really wish Fry's would come to the East Coast.. that place is heaven if you like shopping for computer stuff in person or just need to get something right away.
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Well.. after little more fiddling I thought I had it whipped.. alas.. no. Removed crossfire cable. Noticed that GuiMiner recognized one card as Caymen [0-0], but Caymen [0-1] was gone.. but new option [1-1] Cormorant appeared. Same deal though, they were just accessing the same GPU. Next I moved the DVI cable to the second GPU (hoping to get the OS to see the card had a monitor attached and get that card running), monitor did respond and the second GPU came online and started mining at full speed (mining 305 Mhash (just stock 840 MHz, not OC'd). After a few hours had to reboot (accidentally clicked on a video when web browsing which of course instantly locks the PC). I could not replicate what I did earlier and get the same result. Weird thing is now if I disconnect the DVI cable CPU hard locks instantly so I can't even try moving the cable from one DVI out to the other card. Has anybody successfully just switched monitor cables around so you didn't have to make dummy DVI plugs? I've read through a bunch of post here but haven't seen anybody really have that much trouble getting two cards to mine before.. I guess everybody is using UNIX.
Power supply is OCZ 1000 watts, ASrock Extreme 4 MB, cards are XFX 6950's 2gb.. win 7 64
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I have the same issues with my 6950's.. any ATI or GPUid app hard locks the PC immediately if GUIminer is running (along with playing -any- video, web browsing etc).
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I setup a box with two identical 6950 xfx cards. Configured GUIMiner for pooling no problem.. however one 6950 card runs at 306 mhash, the other only 85 to 95 mhash. Cards are setup with crossfire cable installed and configured as such. Reasons why the 2nd card won't run at speed?
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