Same RAM, completely different behavior?

[john.hollwitz]

I'm on my first build -- AMD Ryzen 5 1600X CPU (https://www.newegg.com/Product/Product.aspx?Item=N82E16819113434), with an MSI b350M mobo (https://www.newegg.com/Product/Product.aspx?Item=N82E16813144019). I also got a set of two Ripjaws V Series 16GB RAM sticks (8GB each) (https://www.newegg.com/Product/Product.aspx?Item=N82E16820231888). Of the first two RAM sticks I got one was a dud. I confirmed that with memtest86, and have been using just one 8GB stick without an issue. Not a big deal, I just ordered another two sticks of the *exact* same kind. They showed up, I pulled out the old one, plugged in the new ones and...my computer boots to BIOS, but doesn't hit Windows. It just keeps rebooting, endlessly. I've run memtest86 on the new chips and they seem fine.

I have tried:

-Extensively resetting the CMOS (hitting the power button while the tower is unplugged, pulling out the battery, etc.). Same result.
-Trying just one of the new RAM sticks at a time. Same result.
-Trying different A-XMP settings. Same result.

Are there any other steps anyone can recommend? Again, these two chips are the exact same make and model of the one that I'm currently using as I type, and the thing is purring along beautifully, if only at 8GB of RAM. Is there a setting or something somewhere that I'm just missing? As I said it's my first build, just don't understand why this works so well with a different chip of the exact same make and model. I've searched high and low online but am running out of Google results....

Thanks for reading.

 

[Karadjgne]

Using the original stick, make sure you've updated the bios to the latest possible for that mobo. It's an original Ryzen, which had multiple ram issues.

Verify exactness of the ram. The best ram for Ryzens at the time had Samsung B-die chips and in g-skill that was the RipJaws V, cas14/15. The models for the Cas 16 looked identical but used different chips. If you now have cas16, and previously had cas14, and are running the original bios, it would explain the issues. Updated bios files contain microcode fixes for the ram issues.

 

[john.hollwitz]

Using the original stick, make sure you've updated the bios to the latest possible for that mobo. It's an original Ryzen, which had multiple ram issues.

Verify exactness of the ram. The best ram for Ryzens at the time had Samsung B-die chips and in g-skill that was the RipJaws V, cas14/15. The models for the Cas 16 looked identical but used different chips. If you now have cas16, and previously had cas14, and are running the original bios, it would explain the issues. Updated bios files contain microcode fixes for the ram issues.

Thank you for the answer! I will have to wait a day or two to look at the chips themselves, but judging from the info on Newegg I may have gotten 15s(?). Where would I find the Cas information on the chip itself?

 

[CountMike]

This http://www.softnology.biz/files.html will show most you want to know abut your RAM.

 

[Karadjgne]

According to the newegg listing, at least 1 set is C15 1.2v. If that's the actual ram you ordered and not just a page showing the ram.

But you can read it right off the sticker on the ram.
Model F4-2400C15D-16GVR

 

[john.hollwitz]

According to the newegg listing, at least 1 set is C15 1.2v. If that's the actual ram you ordered and not just a page showing the ram.

But you can read it right off the sticker on the ram.
Model F4-2400C15D-16GVR

Thanks!