Optiplex 7010 SFF, added two 4GB ram, no post

@Jonski89​ ya, you should have just bought 2 8gb sticks   ,as they need to be bought at once to ensure compatibility

If you have 1 bad slot   you done, just get 2 8gb sticks, my 1st pc 1985, i know my stuff, that pc also has known issues with 4 sticks of some types of ram,,  put 7010 in trash , i got ddr4 7th gen pc 100 bucks best buy market place, nvme slot the hole 9, and dell optiplex 5050 for my kids

@Jonski89​ ya , so if their ram works on its own, return it and get 2 8gb sticks

4x4 is slower that 2×8, it has to travel further, the pc does not support quad channels, so 4 sticks is still running in dual channel mode

Win 10 ends October, it like people trying to hang on to xp pc all over again, lol  i seen this near 20 years ago,   apple will tell you buy new after 3 years, lol

@Jonski89​ sorry i was replying from my gmail device earlier, but ya,, this has nothing to do will dell, same for all pc,, so 1 spec they don't mention you cant mix,, is single ran sr1 and dual rank sr2 ram,,, single rank ram can tell has chips only on 1 side of ram,so its faster,, dual rank is like going around the track 2 times for same race,,  so you will be upgrading your ram to more for slower,,, find 2 8gb single rank ram used is your best option, also its hard to get a pc to use more than 8gb ram, what are you using it for,, ? unless you use an emulator its hard to use that much ram or open 100 tabs on a browser , 

@Dave9qq Thanks for your answers!  I'm avoiding Windows 11 because is doesn't have the 'quick launch' toolbar which I've been loving more than twenty years. I doubt that not having Windows 'support' will make much difference to me. I bought this Optiplex 7010 reconditioned for not many $ about 6 years ago and it's been a great pc. 

The  reason I'm using so much memory is that I have about 30 tabs pinned on Chrome in order to work efficiently.  That takes about 3GB RAM, the rest seems to be taken up by background processes plus Word/Excel and a few other things I run, and totals up to about 90% RAM utilisation.  Then,  when my wife signs in on the same device and doesn't sign out (which she never does) the pc grinds to a halt.  

So you're pretty sure that this aging pc will accept the two 8 GB sticks instead?

@Jonski89​ yes i have a 7010 optiplex for my xp pc  with 2 8's,,   16gb is max supported is 32gb , also i remember mine would not boot with 1333 only 1600mhz ram,,   even though manuals said it supports,,  if have 3450 near the same specs , i have 3470 in mine, ram support goes by the cpu supported,  you can look up and its up to 32gb ram, 

Intel® Core™ i5-3470 Processor

@Jonski89​ my xp wont use 8gb ram but that is what was in it when i picked it up for $50 bucks 5 years ago,, has also gt 1030 i put in and ssd,  3rd gen was last xp supported cpu and dell has drivers for xp for the 7010,, good retro pc,,  i have ddr5 pc now for my main pc,, wow what a difference computers have become,, also have nvme 4th my new pc running at 6000mbs,, lol sata is a joke to me now, 600mbs max for sata ssd,,  once you go black ........................

@Jonski89​ you can get the 7010 here for 40 used. Even 100 on Best Buy site in Canada where I am with 8gb ram, sff and tower and for from $180 with 16gb ram installed. But 180 is way to much for old pc,, lol, 

Refurbished (Good) - Dell OptiPlex 7010 Desktop , Intel Quad Core i5-3570 up to 3.8GHz , 16G DDR3 RAM , 500G , DVD , WIFI , Bluetooth 4.0 , Windows 10 Pro 64 Bit (EN/FR/ES) | Best Buy Canada

@Jonski89​ ya Windows 11 stinks. Even my new Windows 11 laptop 2023 model. I had to put Windows 10 on it. 11 so many bugs. Likely 11 will be better by October when 10 end of life hits. And everyone putting 11 on unsupported hardware I laugh. Been there done that. No drivers for 11 on unsupported hardware so you running 10 drivers on 11. It's really bad, hilarious. It's also rumored Microsoft is soon to stop security updates for 11 running on unsupported hardware. Too funny.

@Jonski89​ also 7010 came with 2 options, 2nd gen or 3rd gen intel, and 2nd needs 1333mhz ram and 3rd needs 1600mhz, my 7010 is 3rd gen with 2 8gb sticks 1600mhz

@computerdave911​  Thanks, but Mr Memory are telling me the 8GB sticks aren't compatible with my 7010, it's 2014 spec,  so maybe that's why - unless you know differently?

@Jonski89​ that is they are going by dell site old documentation, i have 2 8s in mine, here YouTube guy put 32gb,, 7010 came with 2 cpu options 2ng or 3rd, if 3rd supports 32gb, ram needs to be same or looking for issues, absolutely nothing to do with 2014 has to do with cpu 2rd or 3rd gen

https://www.youtube.com/watch?v=i3wJfqh-6Vc