fails running RAM 3Ghz XMP, Taichi Ult + 9900K

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   @bobau The 2 kits having different memory chips on them could well be the problem
in your case. Unfortunately this happens often with RAM manufacturers and is why
tech sites and gurus always recommend matched kits or at least consecutive serial
numbers. When the RAM manufacturer runs out of a given RAM die they will replace
their stock with whatever fits the data sheet for the best price and not bother 
changing the RAM model and in most cases don't even bother to add a revision number.

I have even run into "matched" kits that have samsung on one module and hynix on
the other, clearly one was made before the switch and one after. This was back 
in the days of DDR 400 however and I have not seen the issue pop up since (I 
was not alone and there were complaints). 

IMO they should at the very least add a "rev 1.0" then "rev 1.1" etc every time
they change RAM dies out maybe even as far as "rev 2.0" if the dies come from
another vendor entirely. 

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Xaltar Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: 16 May 2015 Location: Europe Status: Offline Points: 26903	Post Options Post Reply Quote Xaltar Report Post Thanks(0) Quote Reply Posted: 21 Aug 2020 at 7:51pm
	@bobau The 2 kits having different memory chips on them could well be the problem in your case. Unfortunately this happens often with RAM manufacturers and is why tech sites and gurus always recommend matched kits or at least consecutive serial numbers. When the RAM manufacturer runs out of a given RAM die they will replace their stock with whatever fits the data sheet for the best price and not bother changing the RAM model and in most cases don't even bother to add a revision number. I have even run into "matched" kits that have samsung on one module and hynix on the other, clearly one was made before the switch and one after. This was back in the days of DDR 400 however and I have not seen the issue pop up since (I was not alone and there were complaints). IMO they should at the very least add a "rev 1.0" then "rev 1.1" etc every time they change RAM dies out maybe even as far as "rev 2.0" if the dies come from another vendor entirely.