I have two of the old style blades. one has been chugging along nicely at 10 Gh/s with the low clock. today i started the second one. They are both sharing a 490 watt supply. the second one came up with a bunch of Xs. powering on and off got it down to 4 Xs it was running at about 4Gh/s and after the last restart is running at 1Gh/s. is this a power supply issue? do i need to give each it's own Power supply? Both are using the same Slush proxy with unique workers.