Hello I'm pretty new to bitcoins so I'm hoping someone can help me. Currently I'm using this Motherboard
http://www.newegg.com/Product/Product.aspx?Item=N82E16813138318 with this processor
http://www.newegg.com/Product/Product.aspx?Item=N82E16819103944. I have a 5770 and a 4870 on it using a 630wpower supply. Just mining with the 5770 I get a little over 200 mhash, just mining with the 4870 I get about 80 mhash. But when I start mining with both at the same time the 5770 drops down to about 120 and the 4870 drops to about 40.
Anyone know what could be causing this?