Are AHCI drivers any different to Intel RST drivers, for I did try to update those to version 22.214.171.1240 as pato advised, but the system responded that I already have a later version installed. However, the latest RST driver version available on the intel site is version 126.96.36.1996, but I didn't risk installing it since it is not yet endorsed on the Dell site. Should I upgrade anyway? Specially, when I am not even getting the error any longer? It just occurred on the first restart after update to catalyst 13.9 WHQL. And one more thing, is an upgrade to catalyst 13.10 beta advisable or is 13.9 WHQL still the best bet? Thank you!