DNETC Only using 72% of Each GPU?

[Mike029]

This is new and just started yesterday. Checked my maching today and found that DNETC was only running at 72% on each GPU. Here is the specs.

AMD Phenom x2 Callisto560 running at stock.
4gb mem.
80 gb HD
Win 7
2 Sapphire HD5870's (one with dummy plug)
Temps 72 and 77
MB, Asus M4A79T Deluxe

This is only happening with DNETC. When I switch to MW usage jumps to 97%.
Check the web and see recommendation of shutting down HT for intel but not an option on this AMD box. Everything was running fine a few days ago.

Thanks
Mike.

Update: Over 200 errors running Dnetc. I'm at a loss for whats happening. MW runs fine. Dnetc is running into all kinds of problems. Wondering if it's W7? using a dummy plug with W7? The part that has me stumped is that it was running fine. I'll keep reading and taking it apart.