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X370 Gaming K4 BIOS 3.30 9/14/2017

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rares Quote  Post ReplyReply Direct Link To This Post Posted: 14 Sep 2017 at 4:09pm
Originally posted by Xaltar Xaltar wrote:

AMD Ryzen supports DDR4 2666 default, that means it is capable of that frequency without overclocking the RAM. JEDEC 2666 means the RAM's default frequency is 2666 (not 2133 or 2400 like older kits).

If you look at CPUz under the memory tab you will see JEDEC and XMP columns. XMP (eXtreme Memory Profile) is a little different as it forces the RAM to operate beyond it's components rated speeds, typically with higher than rated voltages. 

In other words, this is a good thing, it means that AM4 platforms on that BIOS will default to DDR4 2666 even with XMP turned OFF in the UEFI, provided the RAM has a JEDEC 2666 profile. You would need to make sure the kit supports JEDEC 2666 at the time of purchase however. Most currently available kits only support 2133 or 2400 via JEDEC. 

All in all it isn't all that important to the average consumer, most users will use XMP and overclock their RAM as high as they can get it. For the enterprise/workstation user however JEDEC is a much more robust and stable standard and is used preferentially over XMP in data centers, workstations and the like. At the end of the day, gaming and daily use require a lot less stability than something like a high end render station that can peg all available threads and memory at 100% usage for hours on end.

Excellent post. Thanks for this Wink
X370 Gaming K4 / Ryzen 1700 @ 3.725 / G.Skill FlareX 14-14-14-14-34 @ 3200 XMP / Sapphire Nitro RX480 / SSD x 3
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Xaltar Quote  Post ReplyReply Direct Link To This Post Posted: 14 Sep 2017 at 3:47pm
AMD Ryzen supports DDR4 2666 default, that means it is capable of that frequency without overclocking the RAM. JEDEC 2666 means the RAM's default frequency is 2666 (not 2133 or 2400 like older kits).

If you look at CPUz under the memory tab you will see JEDEC and XMP columns. XMP (eXtreme Memory Profile) is a little different as it forces the RAM to operate beyond it's components rated speeds, typically with higher than rated voltages. 

In other words, this is a good thing, it means that AM4 platforms on that BIOS will default to DDR4 2666 even with XMP turned OFF in the UEFI, provided the RAM has a JEDEC 2666 profile. You would need to make sure the kit supports JEDEC 2666 at the time of purchase however. Most currently available kits only support 2133 or 2400 via JEDEC. 

All in all it isn't all that important to the average consumer, most users will use XMP and overclock their RAM as high as they can get it. For the enterprise/workstation user however JEDEC is a much more robust and stable standard and is used preferentially over XMP in data centers, workstations and the like. At the end of the day, gaming and daily use require a lot less stability than something like a high end render station that can peg all available threads and memory at 100% usage for hours on end.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rares Quote  Post ReplyReply Direct Link To This Post Posted: 14 Sep 2017 at 2:20pm
I don't get it Disapprove What does it mean exactly ? Those Asrock descriptions are so vague.
X370 Gaming K4 / Ryzen 1700 @ 3.725 / G.Skill FlareX 14-14-14-14-34 @ 3200 XMP / Sapphire Nitro RX480 / SSD x 3
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ShampooCA Quote  Post ReplyReply Direct Link To This Post Posted: 14 Sep 2017 at 12:35pm
1.With JEDEC 2666MHz DDR4 module, default set DDR4 frequency to 2666MHz. Test with SANMAX SMD4-U8G48MH-26VR and SMD4-U16G48MH-26VR.
PS1. Windows update is available for version P3.00 or later.

Anyone try this yet?
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