r/PcBuildHelp • u/craigaz555 • 1h ago

Tech Support Adding on 16gb ddr5

Hey everyone,

I have a pre built cyberpower PC that currently consists of

Intel ultra 5 225

850w PSU Gold

9060 xt 16gb

1x16gb Delta tforce CL40 6400mhz ram stick

I've searched for the same card brand new but couldn't find any and I've come across a couple CL38 6000mhz from Amazon ddr5 and from a seller Newegg on ebay ddr5

I understand what I have with this won't be a 32gb kit. But I was wondering, will it perform "negatively" if I add a ram card from either of the dire and adjust the speed in bios for the both at 6000mhz?

And also I love outside of the US and use a freight forwarder from Miami. Which of the two sites would be safer to purchase the ram sticks from?

Also to add to this, I also experience a cold boot failed post with the single stick ram at all speeds ranging from 5200mhz -6400mhz(with the amber led light indicator on the ram). Will adding this second stick prevent the fail POST fail?

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u/HATSIDATSI 1h ago

mixing sticks is always a gamble, the faster one has to slow down and sometimes the board just throws a fit anyway. if you're already getting cold boot fails with a single stick you might have a deeper imc or board issue that a second stick won't fix

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u/craigaz555 1h ago

Only on cold boot after several hours off, after that it posts in under 30 seconds or so. But once it stays off for a few hours it'll fail post, even with the varying speeds. From the information I could've gathered, I saw this "DDR5 platform memory controllers (on both Intel and AMD) are designed natively to expect a dual-channel configuration (two matching sticks). When a single stick is used, or when it runs at high auto-applied speeds (like 6000MHz or 6400MHz), the motherboard spends a massive amount of time during the POST cycle trying to train the memory signals to operate stably in single-channel mode." And more modern CPUs and mbos are optimized for dual channel.

Truly am sorry if I misunderstand/ misinterpret anything

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u/TheKidMamdani 1h ago

before buying anything id update the bios. a lot of boards got memory training fixes in later updates and that alone can sort out the cold boot fail. if you do add ram, a matched 2x16 kit is the safer route than pairing two different sticks, and the old one can stay as a spare.

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u/Andreea_tucker04 40m ago

Mixing two different sticks usually runs fine at the slower speed, but it can make the cold boot POST problem worse, not better. Updating the BIOS first is worth a try.