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Windows 7 cold boot hdmi no signal
Hello! 
At first of all, sorry for my English.
I buy new fresh hardware. Asrock b450 Pro4(bios v4.20), Ryzen 5 2600, Sapphire rx580, G.Skill DDR4 16GB 2x8GB 3200MHz Aegis (F4-3200C16D-16GIS)A2,B2 slots, psu Chieftec 850w, monitor Dell S2421HGF System is new and fresh.
I am understand that Win7 is old and Win10 is better. But i use Win7 and Win10 in dualboot. Win7 and Win10 fresh installed, and both fully updated.
So. Problem with Win7, cold boot and loosing signal. If i boot Win7 from cold boot, after Windows logo, video signal from hdmi is drop, on monitor i see text "no signal" Windows7 is still booting normally on black screen. I do reset and at second boot signal not drop. Signal drop only at first cold boot when pc is stay ~5-10min, and only at Win7, at Win10 signal never drop even boot it from cold start.
How i tried to fix signal drop:
-replace hdmi cable.
-using different radeon drivers
-upgrade and downgrade bios motherboard version
At last i found root of problem. I was set my ram to XMP profile but not factory default 3200mhz, i set lower value 2933mhz.
I decide set XMP to default 3200mhz and voila, Win7 not drop signal at cold boot. Same happens when i use ram without XMP - signal not drop.
Signal is drop only when i set not default 3200mhz, but 2933mhz.
I have question to guru, why is happens? What is connection between ram settings, hdmi video signal and video driver?
ps Signal not drop on second dvi monitor
pps Signal is back when i hot unplug/plug hdmi cable
ppps Signal is back when i restart video driver
At first of all, sorry for my English.I buy new fresh hardware. Asrock b450 Pro4(bios v4.20), Ryzen 5 2600, Sapphire rx580, G.Skill DDR4 16GB 2x8GB 3200MHz Aegis (F4-3200C16D-16GIS)A2,B2 slots, psu Chieftec 850w, monitor Dell S2421HGF System is new and fresh.
I am understand that Win7 is old and Win10 is better. But i use Win7 and Win10 in dualboot. Win7 and Win10 fresh installed, and both fully updated.
So. Problem with Win7, cold boot and loosing signal. If i boot Win7 from cold boot, after Windows logo, video signal from hdmi is drop, on monitor i see text "no signal" Windows7 is still booting normally on black screen. I do reset and at second boot signal not drop. Signal drop only at first cold boot when pc is stay ~5-10min, and only at Win7, at Win10 signal never drop even boot it from cold start.
How i tried to fix signal drop:
-replace hdmi cable.
-using different radeon drivers
-upgrade and downgrade bios motherboard version
At last i found root of problem. I was set my ram to XMP profile but not factory default 3200mhz, i set lower value 2933mhz.
I decide set XMP to default 3200mhz and voila, Win7 not drop signal at cold boot. Same happens when i use ram without XMP - signal not drop.
Signal is drop only when i set not default 3200mhz, but 2933mhz.
I have question to guru, why is happens? What is connection between ram settings, hdmi video signal and video driver?
ps Signal not drop on second dvi monitor
pps Signal is back when i hot unplug/plug hdmi cable
ppps Signal is back when i restart video driver
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