So far i can confirm that the BIOS 0450 Has no PCI-E issue it appears to be working fine, on to the matter on the title memory issue, i think its been sorted in the 0450 BIOS but I'm currently running tests, the release note indicates that XMP issue was sorted.
*Note*
After installing the BIOS 0450 Using BIO file and F7 method i noticed some glitches
1, the memory error beeps were present but i guess it was coz maybe the board had not realized the change brought by the new BIOS so i defaulted the BIOS several times By restarting and defaulting it, plus when i set XMP the first time after update it brought the beeps. But now it appears to be working at XMP 1600 no problem yet four power cycles performed hence i'm still testing.
2. Since BIOS 0447 and now 0450 after selecting XMP the BIOS does not allow saving via F10 while on the memory profile tab, you have to choose different tab to force it to save via F10, basically while the memory profiles have been changed it locks and doesn't allow saving till you move to another tab.
3.And also after the 4 - 5 power cycles i noticed, first i received massage after booting up that memory has been decreased s0 i went into BIOS and my 32GB was 16 GB and the first two dimms didn't show anything so i pressed f9 then save then restart and the whole 32GB come back.
But still after even managing to set xmp at times when i power up the machine go into bios and memory shows 24GB on basic page then if you check advance page it shows 32GB.
So far those are the glitches i have seen, please Intel correct them, and i hope the XMP is permanently sorted coz so far after several try's and got it working XMP 1600 it hasten failed to boot up, but to all who are reading im still testing if anything changes ill update you all.