NVMe PCIe 4 on MB B450?

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Hi, will an NVMe PCIe 4 work on a B450 motherboard? I know it won't reach pcie 4 speeds, I just want to know if i can still use it as PCIe 3
 
PCIe is backwards compatible.

But there's no sense to pay for that GB price luxury, unless you have cattle/sheeps and are feeding them banknotes.
(which clearly isn't the situation with that hardware of your signature)
There's very little difference in game/Windows loading times even between "old slow" SATA SSD and NVMe.
So even higher benchmarketing numbers are even more useless.

Only way for major improvement in loading times would be storing data in same executable format as its stored in RAM to allow sequential copying of it directly to RAM without any usual processing involved in normal program loading.
Meaning game data on drive would be similar to hibernation file used by Windows.

And how normal Windows10 loading process actually mostly happens.
In normal shut down it simply doesn't close itself back to zero point, but saves most of its current memory state to drive to continue from that next time.
And NVMe drive makes very little difference to its loading times over SATA drive, because already that 500MB/s sequential speed of SATA drive is enough to load multiple GBs in handfull of seconds.
And even in low queue depth/low thread count random reads of small files, which is the traditional OS boot process, NVMes aren't that much faster than SATA drives.
 
Instead of PCIe v4 you should go for more capacity.
Because having games and such stuff on SSD instead of HDD is actually what matters.
 
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