My RAM is acting really WEIRD

[kaiju_wars]

So I got this HP AiO from my boss.  (AiO reads All-in-One PC).

Anyways, the specs aren't anything to write home about.  It has a 1600x900 touchscreen display, Athlon II X2 240e, 4GB of DDR3 laptop RAM, AMD Radeon HD 3200 onboard graphics, and a 650GB HDD.

Anyways, I tried to upgrade the memory with a couple of other DDR3 sticks I had laying around.  I have a 4GB 1600MHz stick, and I stuck it in there with one 2GB stick.  It booted to Windows 10 and Windows showed that I had 5.75GB of RAM, weird, but whatever, Windows saw I had the RAM.  So I went about installing Xubuntu onto the AiO, which required me to boot into the BIOS and set the boot order to my flashdrive first.  I get in the BIOS, and the BIOS is only saying I have 2GB of RAM installed, and that only one of the two RAM slots is currently occupied.

 

What's going on here?
I've heard and dealt with the BIOS recognizing RAM, but not Windows.

But I've never dealt with Windows recognizing the RAM but the BIOS not.

[PlayStation 2]

Windows reading ~5.75GB is probably due to reservation for the integrated GPU.

As for the BIOS, might just be a wonky BIOS in general. From what I can remember, all-in-ones are just wonky as hell to mess with in general.

[kaiju_wars]

5 minutes ago, Dan Castellaneta said:

Windows reading ~5.75GB is probably due to reservation for the integrated GPU.

As for the BIOS, might just be a wonky BIOS in general. From what I can remember, all-in-ones are just wonky as hell to mess with in general.

Only other real experience I have with AiOs are the ones at school, which are a mix of iMacs, Lenovo, and HP, and my friend's old iMac and the iMac G5 I'm using as a project PC at work.

 

My friend's old iMac and the G5 at work haven't given me any issues at all, lol.

[PlayStation 2]

1 minute ago, kaiju_wars said:

Only other real experience I have with AiOs are the ones at school, which are a mix of iMacs, Lenovo, and HP, and my friend's old iMac and the iMac G5 I'm using as a project PC at work.

 

My friend's old iMac and the G5 at work haven't given me any issues at all, lol.

To be fair, Apple actually knows what they're doing in comparison to everyone else with AiOs.

[kaiju_wars]

4 minutes ago, Dan Castellaneta said:

To be fair, Apple actually knows what they're doing in comparison to everyone else with AiOs.

Good point