только CPU 

The minerd program does not have an option for failover but the behavior can be mimicked with a batch file "wrapper" e.g. in Windows:-

:start
minerd.exe --url=pool1 --retries=2 --retry-pause=10 etc
echo Pool failover in progress
minerd.exe --url=pool2 --retries=2 --retry-pause=10 etc
echo Pool failover in progress
goto start

In the case above, the minerd program will attempt 3 times to connect to pool1 with a 10 second interval between tries. If that fails, or if it has already connected and the connection goes down, it will attempt to connect to pool2. If pool2 fails, it will loop round and try pool1 again.

I will be releasing a batch file for Windows that performs failover for you, providing that you have identical user/worker names on both pools. You can expect this release very soon - the working part is 100% ready and is really just an embellishment of the code above - but I am still applying the finishing touches to the setup program.

Maybe many switched over to suprnova? Is setting a failover pool possible in minerd like with bfgminer or cgminer?

I saw a post from Spexx. He is testing things.