Can't overclock RAM when using both slots

alexkon16

Prominent
Aug 31, 2017
4
0
510
Hello guys,

I recently put together a ryzen build as following:

cpu: ryzen 5 1600 (no OC)
motherboard: asus prime b350-plus
ram: corsair vengeance 16gb (2x8) ddr4 3000mhz (CMK16GX4M2B3000C15) (it's on the mobo QVL, stating it can be overclocked at 2933mhz)
gpu: gigabyte gtx 1060 windforce oc 3gb (factory overclocked only)
psu: corsair rm650x
storage: sandisk ssd 256gb ultra plus (only pc part i used from my previous pc, as far as i know it's in excellent condition)

The ram is read at 2133mhz, and the pc works fine*. If i try to overclock at 2933mhz the pc will boot loop. I tried testing 1 ram stick at a time and what i found out was that when i have only 1 stick placed at the 4th slot i can overclock it at 2933 stable. If i have 1 stick placed at 2nd slot and try to overclock the ram, i get boot loop (tried with both sticks).

*Not exactly fine, when i am in bios it's very laggy and choppy, like if im moving the cursor, a few frames get cut off every few seconds. Also in games (mostly noticed on BF4) i get some weird fps drops. I play bf4 on ultra with 120+ fps and it might drop to 30-60 for 1-2 sec, once it dropped to 15.
It gets veeery choppy, frames are cut off and i get the bf4 warning icon for low fps (severe).

Also, i have latest BIOS version, latest drivers for everything, windows 10 64bit fully updated.

Temps are also fine, playing bf4 on ultra at 67-70C (gpu) and 49-51C (cpu).

So, i ask you guys is there something faulty with the motherboard? Could a faulty motherboard cause these fps drops i described? or could this be a gpu/cpu problem?

Thanks for the support!



 

Barty1884

Retired Moderator
Ryzen boards have been a little picky with XMP (A-XMP, whatever) profiles, it is strange you've got a kit on the QVL and having issues though.

Have you tried a lower profile (ie 2666MHz, probably Profile #2) with both modules installed? How do things work then?

You could try manually entering your timings, and perhaps providing a small voltage boost (0.05V should be sufficient) to attempt to get them stable @ 3000MHz.
 

alexkon16

Prominent
Aug 31, 2017
4
0
510


Thank you for the reply.

There is only 1 XMP profile (DOCP in bios), with timings 15-17-17(-17)-35, frequency 2933mhz and 1.350v. So if i try a lower profile i need to do it manually and i'm not sure of what timings and voltage i should use (kinda new at this, it's my first build).
 

Barty1884

Retired Moderator
Yeah, if there's only the one profile, don't bother right now. Usually they ship with a few profiles if they can do 3000MHz.

I'd manually enter those timings (as per the DOCP profile) and increase the voltage to 1.355V initially. See if it'll run successfully. If not, try 1.36V and see.
 

alexkon16

Prominent
Aug 31, 2017
4
0
510


Tried it, got boot loop again.
 

alexkon16

Prominent
Aug 31, 2017
4
0
510
Ok apparently i was told by a friend to try even higher voltage, i tried 1.4Volts and it's stable now. I will start going down by 0.01Volts at a time to find to minimum voltage needed. Still not sure why it won't work when using only 2nd slot, and will work when using only 4th slot. Is this supposed to happen? Also is choppy bios something to worry about?