Well, tried out Phoenix Miner and I have the same issue. Also, it seems to do about the same as GuiMiner when it comes to Mhash/s. Fiddled around with the settings for quite a while and eventually got it to the best I could, which ended up to be very close to what GuiMiner was doing. Thanks for the tips. I just feel that I could do better with this card. I've seen people doing 400, but I'm only able to do 350 MHash/s.