A few weeks ago AMD released new  AGESA 1.0.0.4 microcode for their Ryzen motherboards that brought better memory compatibility and performance towards the Ryzen platform.  However some of you might have noticed it already, there are AGESA 1.0.0.4a firmware’s available.

AGESA 1.0.0.4a brings a performance improvement in relation to boot and post times for AMD platforms. Website Golem has tested this with a few motherboards like the MSI X370 Xpower Gaming Titanium which indeed speeds up that process. Also they state that the 4-dimm support now is better, e.g. they can make use of four DIMMs at DDR4 2667 MHz

As mentioned in my reviews, with each update AMD Ryzen will get better. Check your motherboard manufacturer website for more info and availability of AGESA 1.0.0.4a firmware based updates.
 

Ryzen to Post Faster With new AGESA 1.0.0.4a microcode