Pg z790 lighting xmp not working

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   Hello everyone.

Short summary:

I have a i5 13600k
16 GB Kingston fury KF556C40BBAK2 5600 CL40-40-40 (which is on the list)
(Before the upgrade to 32GB, BIOS version 2.06)

Since I have a 4090 in it I wanted to play on 4k, so wanted to upgrade to 32 GB om ram since some games require it.

Bought the exact same ram and installed it, all went fine. Started the pc up and checked in the bios if it detected the extra 16 gb which it did. (btw its 4 slots of 8 GB)

Enabled the xmp profile 1 (which is 5600 and cl40-40-40)
Restarted.

For some reason, whatever I try to change in the bios the XMP wont work. It's stuck on 2000mhz and I have no clue why.
So I thought, upgrade the BIOS maybe that's the problem. So have version 6.08 installed now.

While installing it took some time which felt odd, also restarted twice then it booted and I went into the BIOS to enable XMP again.

Still stuck at 2000mhz.

I have no idea why it does not work since the RAM is compatible (on the list).

Please help. 

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Outblast84 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 07 Jun 2023 Location: Netherlands Status: Offline Points: 80	Post Options Post Reply Quote Outblast84 Report Post Thanks(0) Quote Reply Topic: Pg z790 lighting xmp not working Posted: 07 Jun 2023 at 3:26am
	Hello everyone. Short summary: I have a i5 13600k 16 GB Kingston fury KF556C40BBAK2 5600 CL40-40-40 (which is on the list) (Before the upgrade to 32GB, BIOS version 2.06) Since I have a 4090 in it I wanted to play on 4k, so wanted to upgrade to 32 GB om ram since some games require it. Bought the exact same ram and installed it, all went fine. Started the pc up and checked in the bios if it detected the extra 16 gb which it did. (btw its 4 slots of 8 GB) Enabled the xmp profile 1 (which is 5600 and cl40-40-40) Restarted. For some reason, whatever I try to change in the bios the XMP wont work. It's stuck on 2000mhz and I have no clue why. So I thought, upgrade the BIOS maybe that's the problem. So have version 6.08 installed now. While installing it took some time which felt odd, also restarted twice then it booted and I went into the BIOS to enable XMP again. Still stuck at 2000mhz. I have no idea why it does not work since the RAM is compatible (on the list). Please help.

Outblast84 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 07 Jun 2023 Location: Netherlands Status: Offline Points: 80	Post Options Post Reply Quote Outblast84 Report Post Thanks(0) Quote Reply Posted: 07 Jun 2023 at 3:34am
	Also, another odd thing, it takes way longer to boot with 6.08 then it did with 2.06.

RLGL Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 29 Jul 2018 Location: MN Status: Offline Points: 2025	Post Options Post Reply Quote RLGL Report Post Thanks(1) Quote Reply Posted: 07 Jun 2023 at 4:43am
	The ram must be a matched set from the manufacturer. This ensures the chips will be all the same type version etc.
	Asrock Z370 Gaming K6,Intel i7 8700K, Asrock x570 Taichi

Outblast84 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 07 Jun 2023 Location: Netherlands Status: Offline Points: 80	Post Options Post Reply Quote Outblast84 Report Post Thanks(0) Quote Reply Posted: 07 Jun 2023 at 5:12am
	It is, they are both exactly the same. Same type number, same brand, same amount (8GB) etc.

Outblast84 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 07 Jun 2023 Location: Netherlands Status: Offline Points: 80	Post Options Post Reply Quote Outblast84 Report Post Thanks(0) Quote Reply Posted: 07 Jun 2023 at 8:56pm
	Just figured it out, so if anybody wants some 16gb ram, I have 2 sets. XD

patla8640 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 09 Jun 2023 Status: Offline Points: 30	Post Options Post Reply Quote patla8640 Report Post Thanks(0) Quote Reply Posted: 09 Jun 2023 at 4:33pm
	I have been digging through forums looking for the answer to this. I cannot find an option in the bios to enable the XMP. My processor is 13th gen i9, Corsair ddr5 is marked as XMP ready. It's installed in the correct slots. CPU-Z sees it running at 2400mhz, and SPD Ext is greyed out. The memory is listed on Asrocks qvl, Any help would be appreciated.

Outblast84 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 07 Jun 2023 Location: Netherlands Status: Offline Points: 80	Post Options Post Reply Quote Outblast84 Report Post Thanks(0) Quote Reply Posted: 09 Jun 2023 at 8:16pm
	Hey Patla, in my case it's because the two sets of 16GB are not an actual 'factory' set. If I bought the 4x8 GB at once then it would be and XMP should work. It's also possible that it only works dual channel, xmp. I got 2x16 gb now, and it works fine again.

patla8640 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 09 Jun 2023 Status: Offline Points: 30	Post Options Post Reply Quote patla8640 Report Post Thanks(0) Quote Reply Posted: 13 Jun 2023 at 6:52pm
	The ram must be a matched set from the manufacturer. This ensures the chips will be all the same type version etc. JJsploit app