Currently running 1x XFX RAD 7800 and a ATI 5700 on different machines with 2 workers.

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ImageShack.usthis doesn't seem to be right?
7800 is the series. What's the actual model? 7850?
Either way the 7800 should perform better. Many cards require a lot of tweaking to get them to run at their best. What are your CGMiner settings? Are you even using CGMiner?
hardware error.