2 cores is practically nothing. That shouldnt cause significant performance issues. That's 1% of cores not working on a die, or a couple of GH/s
but this one is performing 25% worse than normal one
Good One shares 7630336 (99.78%)
This Bad One shares 6264832 (99.64%)
How to find out where the problem is ?
Find out at what page users started reporting reception of miners and what they did that was or was not successful at improving performance. (chuckles)
I'd suggest shutting down, then putting light pressure on the tops of the VRMs one at a time. Don't expect to put enough pressure to get a snap sound. Then boot and install firmware 0.90, run enablecores.bin, shutdown, wait 30 seconds, startup. Open a new browser, go to your webpage address, sign in, hit check status, wait a few seconds, give it a control+F5, the browser refreshes, at this point sometimes it will only show 2 or 3 cores. Close IE, open a new instance of IE, repeat the process, you should now see all cores and at what percentage they're running. If there's an improvement you can move up in firmware versions or stay with 0.90. Anything over 0.94 will use less energy. Then decide if the increased power usage warrants the additional GH/s and go with the firmware you feel is best.
going back to 0.90, running enablecores.bin,
