Nope! Tried it, no difference. My 16gb of Crucial 3000mhz, which is on the QVL, simply will not work on XMP. Far earlier in this thread (if you look through it), when on earlier BIOS's, I could use XMP, I could boot quickly if I enabled MRC Fast Boot - in the bios memory settings. (The fast boot option in the bios BOOT menu has never made any difference).
Using the last three bios upgrades, I can't EVER boot using the XMP. Since then, I've been running the memory at 2800mhz in auto (not manual or XMP). It runs fine, boots quickly etc.
When I was able to run the memory at 3000mhz, on XMP, if mrc fast boot was not enabled my machine took an age to boot. The last three bioses have basically disabled my ability to run this memory on XMP. However, on reflection, when it was running at 3000mhz, on xmp, my machine was unstable, sometimes it would go crazy and refused to shut down, gaming would suddenly turn choppy and the whole computer would then go a bit crazy, hanging on shut down etc etc. This only happened infrequently, so I didn't manage to diagnose it, thought it might be a game, windows install etc. Once the bios stopped my using XMP at all, going to 2800 auto solved every problem I'd ever had! So my qvl memory doesn't work properly with this mobo at its correct speed and NEVER did properly. Works fine at 2800 - annoying. Short of changing memory, nothing I can do.
Silent Scone was saying that bypassing the memory checks when running at a particular speed wasn't a good idea unless one is SURE of its stability. Once Lahatg had shown me where the MRC fast boot option was, I thought the problem was solved. It was not, if the bios doesn't want to boot normally (quickly!) with your memory at its XMP. Stop using the XMP is my advice, change speed. Or change your memory.
Edited by oldtony - 1/3/16 at 5:42am
Originally Posted by Silent Scone
This is memory training. This option should only be enabled when adamant the memory is stable. Since day one I and others have been trying to explain to the people complaining DDR4 training routines are what cause these longer POST cycles. They are important, oddly not nearly as many people complained about this on x99. Go figure. With MRC fast boot enabled the system will not retrain the memory which can lead to undiagnosed system instability.
Memory should be tested with the proper means first, either HCI Memtest pro or Google Stress App test via Linux Mint.