Bought 8 (seemingly) identical memory sticks, 2 refuse to work but the other 6 are fine?

marcobenik

Prominent
Oct 31, 2017
2
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510
So about a year ago I purchased 4x4GB "g.skill Ripjaws V DDR4-2400" to go with my new motherboard. After a while I decided to upgrade this to 32GB, so I purchased four more memory sticks of the same model (the mobo has 8 slots), but for whatever reason two of them straight up don't want to work with my PC. Any attempts to boot up with those sticks installed result in my pc never booting. The PC would either stay on and do nothing, or shutdown on its own. I've tried booting the PC with just the two sticks and each stick individually, both with and without the working sticks, none of it works.

When I purchased the additional memory sticks they came in two packages, each containing two sticks. I checked the label on each individual stick to see if there was any noticeable difference, but all data on them besides the serial number was identical, and the serial numbers were only a few digits apart, so they were most likely part of the same production batch.

I have already tried returning these sticks to the store I bought them from, but they sent them back stating that they are functioning normally and that I can't get a refund. This store is one of the largest stores in my country (ALTERNATE Netherlands), so I think it's safe to assume they're not lying to me either.

Is there any logical solution as to why these two specific sticks could not work with my PC?

Specs:
Motherboard: ASRock X99 Extreme4
Processor: Intel® Core™ i7-5820K
Memory: g.skill Ripjaws V DDR4-2400
Operating System: Windows 10 v1703 (OS Build 15063.674)

Also, here's a picture of a couple of memory sticks, the boxed ones are the defective ones, the one on top of the box is part of the initial batch that I bought earlier this year.

eiyhp.png
 

Zerk2012

Titan
Ambassador
Memory is sold in a matched set 1 package for a reason their tested to work together any time you add more memory or buy 2 seperate sets even the same memory their a chance it will not work.
You can try increasing the voltage from 1.20 volts to 1.25 volts.
If that fails keep the same timings and 1.25 volts but lower the speed to 2133.
 

marcobenik

Prominent
Oct 31, 2017
2
0
510


The problem isn't that the memory doesn't work together, it's that those two specific modules don't work with my setup, even when used as a standalone. Would the voltage/speed thing still be applicable if it's an issue with my setup and not the other ram modules? I'm not at my pc right now so I can't test it, but I'll give it a shot once I'm able to.

Edit: I did both of these things, changing voltage did nothing, changing DRAM freq to 2133 caused a bluescreen on boot (with the problematic ram modules installed), and a crash on boot screen on 2nd boot. I've never seen the bluescreen before, and wasn't able to replicate it afterwards either. Sadly I didn't get to look at the error code as my pc restarted itself a second later.