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I have 2x4 rams and upgrade it to 2x8. The 2x4 doesnt have any problems, you can switch it or whatever. And the 2x8, i can use them both on slot 1, but cant use them on slot 2( make my pc wont boot) And now because i cant use the 8gb ram on slot 2, im just using 8gb on slot 1 and 4gb on slot 2. Can anyone tell me, how to fix this pls.
Depending on the OEM of the motherboard or complete system, some are more particular than others about timing and quality as well. Like for example on the HP Elite series in general, it’s not unheard of for cheaper RAM to fail POST as the HP BIOS is very, very unforgiving about sloppy timing on the Elite series as a whole (EliteDesk AND EliteBooks). The Pro series is also unforgiving, but not like the Elite series. While RAM tolerances may make upgrading somewhat tricky, the Elite series is still a much nicer machine to the point I accept the tradeoff for the much better chassis despite the fact Elite desktops often need a DP>HDMI adapter on most displays as they usually lack HDMI (it is possible to change the “flex card” in some of the HP desktops, to fix it but the adapter tends to be cheaper). For laptops, it’s the IPS displays (often FHD or 4K). HP Z? TOTALLY unforgiving. There is no mix and match on the Z line; you’re replacing ALL of the RAM.That said about the HP RAM timing sensitivity issue, most name brands work just fine but notably with HP, mix and match is very tricky unless you use OEM HP RAM, or RAM HP would normally use. (Even then, I don’t recommend mixing memory, unless you can troubleshoot it yourself, or use large enough modules to cover it with minimal performance penalty IF you need to downgrade).I have 12GB in my fixit challenge 840 G5 (Crucial 4GB of unknown origin — no HP Spare#, so likely added due to the notebook being sold due a bad screen to have something to avoid the “no RAM” scar+8GB SK Hynix from an HP) and it accepted it, but I used quality RAM. Dells can also be quite picky, especially Precision series machines — some requiring ECC/Registered RAM to even boot (primarily Xeon workstations). While they tightened up the tolerances as well after Broadwell across the range (prior, you could basically put anything into a Dell prior to Skylake on most machines). Today, there’s still wiggle room to mix and match as long as quality RAM is used. No more putting the cheapest Chinese RAM you can get in though.Back in the DDR/DDR2 days, you could put the worst memory China had to offer (with matching CAS sloppiness) and mix it with OEM Micron/SK Hynix (or quality 3rd party RAM) and the machines would boot, even if there was screen glitching ESPECIALLY with the Intel/AMD onboard video. It was a matter of when (not if) it has a BSOD in many cases, but the BIOS didn’t care back then. It was so easy then, the first 640k had to pass and it would boot, even if you had graphical issues due to the module having bad memory.The reason they ended this practice is inexperienced users seeing us throw cheap RAM at these Dells all day long and knowing it worked, without asking what we did to make sure it’s stable (8+ hours of Memtest 86/86+). Eventually it became a support nightmare, so Dell increased the tolerances when DDR3L was mandatory (Haswell) — the 1.5V DDR3 machines retained most of that tolerance. Now with DDR4, the machines are even more particular. If the modules failed POST on a DDR/DDR2 Dell, you were dealing with truly bad memory. Heck, I remember intermittent modules working on those Dells! Was it a dangerous compatibility game? Yes, but as a 13-year-old I took advantage of it for years. This stuff booted in old Dells for YEARS:
I found these on one of my accounts, and I’m showing you for the sole purpose of how easy abusing the machines with bad RAM used to be. These days are over. What brand are the modules? A recognizable name, or no-name modules? No-name modules have become more and more incompatible since JDEC also clamped down on crappy modules with the DDR4 standard; yeah, it took that long for JDEC to tell China to stop making junk. I agree it’s not great that JDEC and the OEMs aren’t clear about this, but do you really expect transparency on the exact issue when they make money hand over fist selling modules themselves?
Some pc’s don’t like that ram config. If you have more than 2 slots i would try different ram configs. A common one is 1 in the 2nd slot and 1 in the 4th slot. Hope this helped!
