hi thanks for the help but gigabyte finaly gave me an answer and here it is for people that have the same prob
Hi,
Since AMD does not support or guarantee ganged mode, they suggest to remove this feature on our latest bios.
According to AMD ----
Two modes in AMD CPU for memory interface.
1. Ganged mode -- two memory controllers are tied to work in 128bit mode
2. Un-ganged mode – two memory controllers are working independently, but still can be treated as 128 bit mode.
Un-ganged mode is having better performance (overall), hence AMD suggests using this mode.
The “64 bit” indicates 64bit for each memory controller in un-ganged mode.
64 x 2 still equals to 128.
So, in un-ganged mode, NOTHING been downgraded,