Power off again switch off mains now try and install 1 x 16gb from your new kit but before switch on clear cmos
Corsairs often suck on Ryzen. G.skill Trident Z is specifically designed for ryzen I think while the appeal of Corsair lpx is being cheapish?
Maybe clearing the cmos will help your mobo decide if it wants to boot with a dimm of the new capacity. So hard reset, switch off power and mains, remove cmos battery for 5 minutes, pulse the power button a few times to drain residual power
then pop the cmos battery back and power back on. If it boots ok shut down again, switch off, add the second 16gb dimm.
If it doesn't boot with 2 dimms then clear cmos again. If not boot whatever you try, well I guess you can attempt to update the mobo bios to the latest version if it isn't already and try again. if it won't boot no matter what, send back the corsairs and get g.skill trident z instead.
You could use the clear cmos jumper rather than remove cmos battery either way I find cmos jumper fiddly but sometimes the cmos battery access is blocked by gpu so either/or.
Is that the
Asrock B450m Pro 4? Can we talk about exactitude for a moment since there could be a variety of models with a 'Pro' moniker my search results return 4 variants Pro 4, Pro 4 Rev 2.0 Pro 4 -F and Pro 4 -F Rev 2.0 and each board has it's own support page.
Don't want to download the wrong bios f'rit. Also want to look at a
memory support list which doesn't have a list explicitly for zen 3 vermeer so I looked at zen 2 summit ridge and that doesn't list explicitly any 3600mhz corsairs which doesn't prove they don't or can't work on it only doesn't explicitly say that they were tested by the manufacturer with it.
It doesn't expressly say it supports any 3600mhz memory the specification page (of one of the varieties of board) says:
AMD Ryzen series CPUs (Vermeer) support DDR4 3200 / 2933 / 2667 / 2400 / 2133 ECC & non-ECC, un-buffered memory*
Supports Extreme Memory Profile (XMP) memory modules
- 15μ Gold Contact in DIMM Slots (<-- I didn't know that was a thing until today!)
The Memory Population Table says you can have 2 Double Rank dimms up to 3200mhz in slots a2 and b2. However the 3600mhz single rank 8gb dimms work in it and exceed the specification without being documented. - Maybe that's the most it can do.
What I might do then since you appear to be in the position of Experimenting with Dimms is, switch off XMP in the bios and see if it'll load without it. So to do that you will need to set the setting with your old 8gb 3600mhz corsair dimms, save exit reboot once, shut down and then switch off the mains and then Don't clear the cmos/Bios and simply Install your 16gb dimms and see if it'll boot with xmp off.
It would also be nice to know the Part Number of the Dimms eg F4-4133C19D-16GTZKWC (<--it's a g.skill trident z and probly expensive one)
Here you can see there is a 4133mhz dimm supported with the (a variant of the) mobo despite of what it says it supports on the specification page. And that is only documented for summit ridge can one presume it'd work on vermeer, who knows?
What you can also see at a glance if you filter corsairs that there are no supported 3600mhz corsairs on it so you are simply fortunate that your 8gb modules worked on it. Non Compliant Memory can work but it can also not work.
So the board has probably gone through some bios updates that 'improve memory compatiblity' and support Zen 3 vermeer but the documentation has not.
Looks ok for bios updates since you're using vermeer not summit raven or pinnacle ridge cpus on it. If you're already on the latest bios then probably the 16gb modules simply don't work with it.
Try g.skill trident z instead.
Specifically (or ripjaws v)
This one is the only one that says it supports asrock on amd on it's qvl (qualified vendor list) and that's for a b550 - F4-3600C18D-32GVK - so you're going out on a limb no matter how hard you try to be qvl compliant for a cheap old b450 mobo.
it might or might not work but same could be true of any dimms you buy, compliant or non compliant just a crap shoot sometimes.
Your certainly non compliant 3600mhz 8gb single rank corsairs worked. Hit. Your certainly non compliant 16gb double rank did not. Miss? At least you got to play a game like hasbro battleships.
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