GPU0: invalid nonce - HW error is mostly caused by the catalyst driver. Update to the latest or roll back 1 or 2 versions to see if it runs the same Sgminer config.
Edit; Could also be intensity, see https://bitcointalk.org/index.php?topic=179718.0
Don't know anything about coding but I'm a hardware freak. If there's anything specific that you guys need I can slap it together and set it up (for remote access).
Leave --failover-only, --xintensity --gpu-threads and --no-submit-stale and the multipool out for a minute. Start with a basic config and work towards something this specific.
See if the standard config works: sgminer.exe -k darkcoin -o stratum+tcp://"poolURL" -u...
From what little I can see: Intensity is wrong, its on 100. Intensity ranges up till max of 19-20 depending on the card (7990 uses 13i max, 7950 18i or 19i). You're also getting a hardware error immediatly wich mich might relate to this.
Some more info provided on your settings would help out...
I've ghetto-rigged some HW back together, is it possible to point couple of 7990's to your pool?
Maybe you could also tell me what the advantage of a multipool over a dedicated one is (I've been using Coinotron before). Thanks :)
Anycoindirect offers a service for coin to euro but I'm not sure if their services extend across the ocean ;)
Edit; I've been buying and selling trough them for several times now.
Thanks, been keeping an eye on some exchanges and also notice people trying to make quick money by creating those swings. Won't lose faith in DRK because of that, just picked up 500 at a steal :)
I'm afraid this is due to the limitation of the motherboard. Even if the cards get recognized it probably cannot provide enough bandwith and/or power trough all slots without bottlenecking a bit.