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Memory speed troubles

Memory speed troubles

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Yokijirou
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02-23-2019, 08:50 AM
#11
posting and booting into an OS are different things. For Ryzen, the procedure is: AGESA initialize --> BIOS loads --> Boots OS from boot drive. It could very well crash before it managed to boot, so it rolls back to previous phases with the last stable setting (or whatever the SPD profile has that's JEDEC spec) and manages to boot.
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Yokijirou
02-23-2019, 08:50 AM #11

posting and booting into an OS are different things. For Ryzen, the procedure is: AGESA initialize --> BIOS loads --> Boots OS from boot drive. It could very well crash before it managed to boot, so it rolls back to previous phases with the last stable setting (or whatever the SPD profile has that's JEDEC spec) and manages to boot.

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KingQbert
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03-01-2019, 11:20 PM
#12
It probably happened around 2133. Every board restored the frequency to 2133, which is the minimum setting for DDR4.
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KingQbert
03-01-2019, 11:20 PM #12

It probably happened around 2133. Every board restored the frequency to 2133, which is the minimum setting for DDR4.

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nathancraig7
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03-09-2019, 02:00 PM
#13
You haven't evaluated enough memory kits. This seems accurate since most units rated over 2666 typically feature a 2133MHz CL15 profile as their second fastest speed in the SPD chip, which is what manufacturers aim for. If a kit offers a 2666MHz CL19 profile at the same time (SPD chips generally support up to four profiles, including the exclusive XMP one), the board would attempt 2666MHz CL19 first.
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nathancraig7
03-09-2019, 02:00 PM #13

You haven't evaluated enough memory kits. This seems accurate since most units rated over 2666 typically feature a 2133MHz CL15 profile as their second fastest speed in the SPD chip, which is what manufacturers aim for. If a kit offers a 2666MHz CL19 profile at the same time (SPD chips generally support up to four profiles, including the exclusive XMP one), the board would attempt 2666MHz CL19 first.

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_Brony_
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03-13-2019, 07:47 PM
#14
I wasn't aware of that.
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_Brony_
03-13-2019, 07:47 PM #14

I wasn't aware of that.

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Shotgun_F
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03-14-2019, 03:19 AM
#15
I verified and ran some tests, but results were inconsistent. The XMP settings showed 18-22-22-42. I attempted to adjust them manually beginning at 3200, which sometimes worked but frequently reset to SPD or reinitialized the BIOS.
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Shotgun_F
03-14-2019, 03:19 AM #15

I verified and ran some tests, but results were inconsistent. The XMP settings showed 18-22-22-42. I attempted to adjust them manually beginning at 3200, which sometimes worked but frequently reset to SPD or reinitialized the BIOS.

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