RAM XMP/Overclock Troubleshooting

[zebra67]

As is the title - I'm trying to get my RAM to run at advertised speeds..

Namely, because I'm a poor man.. there is 2 different, but very similarly spec'd RAM kits (2x 16GB kits)

They both have the same SPD profiles for XMP, other than the max speeds. One kit can max at 3200, the other at 2998.

 

I'm trying to get them BOTH running at 2933 with the mirrored SPD profile settings; though, to no avail.

I only recently picked up a 2nd kit of RAM, so even with the first kit.. I was unsuccessful in getting anything to work.

 

I tried the XMP profile, as well as manual input for speed, and timings.  - Nothing will stick.

I get the 3 training/test-boots after a UEFI settings update/save.. and let it boot to windows to jump into CPU-Z to see if things kicked in... (yes I know I could check in my UEFI, but if it works, and I can jump straight into using the new speeds.. why go into UEFI?)

 

The settings I tried to apply are as follows.

 

Frequency - 2933

CAS Lat. - 16

RAS to CAS - 18

RAS Precharge - 18

tRAS - 38

tRC 56

Voltage: 1.35

 

Anyone maybe clue me in why I might not be able to get these to work?

I understand that motherboard manufacturers also supply a list of 'guaranteed to work' kits, but surely you can still occasionally get the every-day-joe kits to work too, right???

 

Edit:

RAM kit PN's as follows:

Original Kit: TEAMGROUP-UD4-3000

Newer Poor-Man Kit: PNY 8GBF1X08QFHH38-135-K

Edited August 29, 2021 by zebra67

[Cyracus]

Mixing ram kits is a lottery.
If you can at least make sure the ram chips are the same (samsung b-die, micron e-die, hynix cjr/djr, etc) it's more likely to work out.
Different ram chips have different characteristics so they don't always work together unless you throw timings out the window (and even then sometimes it just won't work)
You didn't mention what platform/chipset you're on, it makes a big difference.
ddr4 oc guide may help https://github.com/integralfx/MemTestHelper/blob/oc-guide/DDR4 OC Guide.md

[zebra67]

8 minutes ago, Cyracus said:

Mixing ram kits is a lottery.
If you can at least make sure the ram chips are the same (samsung b-die, micron e-die, hynix cjr/djr, etc) it's more likely to work out.
Different ram chips have different characteristics so they don't always work together unless you throw timings out the window (and even then sometimes it just won't work)
You didn't mention what platform/chipset you're on, it makes a big difference.
ddr4 oc guide may help https://github.com/integralfx/MemTestHelper/blob/oc-guide/DDR4 OC Guide.md

"Mixing ram kits is a lottery."

I did purchase the 2nd kit with this in mind - hence my mentioning even with the original kit, I was unable to get XMP or manual settings to stick... and furthermore with my mention of knowing my Mobo ((which happens to be what I didn't mention, the chipset) a ASRock X470 SLI/AC with Ryzen 7 2700X) not officially supporting either kit..

 

For every day use, both kits seem to be just fine at their factory under-clocked speed; with use in windows, and games. - Understandably this doesn't mean they will work together then overclocked with the same timing/frequency. Also, I know that ultimately even if I do get it to work, I may only get a 5-10 FPS increase in games, etc etc etc... At this point with this F*cking mobo, I just want something to work as it's suppose to.

 

I'll check out the oc guide, though. Will report if anything helps/fails.

Feel free to offer any extra input aside from the oc guide.

 

Cheers.