OK lol i got my PC stable @2133 and 2400 with my stick of HyperX 2666 but i need a stick of cheap 2133 or 2400 to get it stable enough to flash my bios lol every time i try M flash it it crashes again and more trying to boot pain 
lol
Confused as to what is the problem.
So your RAM causes instability and now you are looking for more RAM?
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System specs please
You say it's stable at 2133, why can't you flash the bios then?
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I bought am MSI B350M Gaming mainboard and kingston hyperX 2666 but the bios is buggy and it runs the speeds that arent overclocked good but a 2666 the bios freaks out i need to flash it for stability
When i go into msi M flash it restarts an crashes and wont restart
The bios is the original bios it is supposed to handle my ram but its quirky so its acting up i need the cheap shit that always works to get it to flash my bios
@ 2666 this board is running it overclocked is what i am saying
then is sounds like you need to run it at 2133 to flash it unless you are having problems at that speed too.
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I do have em at that speed lol
so even at stock speeds of 2133 m-flash crashes?
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Yes it does
But it is a 2666 stick
My 3200 rated memory was running at 1333MHz before the first BIOS update for me. Then at 2133MHz (or so) and another update later, I am at 2666MHz.
Slow and steady wins the race!
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that doesn't matter, standard for ddr4 is 2133 all other speeds are overclocks
are any of your timings or voltages manually set?
try resetting your bios to default if that is the case.
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My bios has been save reset and saved again multiple times lol its my stick of 2666 i need a bios flash but in order to do that i need some cheap 2133 or 2400 of compatible stable ram or m flash dont work lol i figured it out