32GB Memory only 23.8 useable

[dovahkiin]

I have a HP Envy HP-1534, and it came with 10gb ddr3 1600 upgradable to 32gb on my 64bit OS Win 8.1. Just installed 4 8gb sticks which came in a set, and booted up found bios reported 32gb ram at 1333, but it's 1600. (that was 1st thing) I looked in system, and it said  installed memory 32gb. (23.8 gb usable).  I shut down PC, and re-installed memory switching it around to different slots, and booted up nothing changed.

The 10gb that came with PC (the system reported 10gb all usable)which only used 3 slots and 4th was empty. I shut down and removed 4th stick of 8gb ram and booted up, and system reported 24gb all usable. The system see's the 32gb, but only use's 23.8...thats's not right. Googled it, and found a lot of folk having simular issues, but found some fixes that didn't fix like going to msconfig/ boot/advanced options and on right an empty check box saying Maximum Memory, so I checked it and entered 32gb/ok/ apply/ restart, but no change.  Ran memtest86 ran over 16 hours, and I shut it down and it reported  all 4 8gb dimm good.

Sorry about giving too much info, but does anyone have a solution?

Thanks for your response, Ken

[Big_Dave]

Hi,

Some HP PCs the use  8 GB 1600 mhz dimms will only run 1333 mhz so that may explain why you are not seeing 1600 mhz.

Where are you seeing only 23.8 GB available?

Start resmon.exe in the windows/system 32 folder and take an image of the of the memory display showin the physical memory allocations.  See the below image.

[dovahkiin]

I seen it in Control Panel under "System" Installed Memory(Ram) 32gb--23.8 usable (Not Available)

Before I forget on the 1333 that is suppose to be 1600...the old memory which is also 1600 was reported by bios as 1600.

I looked at Resmon basically i'm seeing what your showing below. But like I said with the old 10gb installed, and don't mention anything about part of it being usable.

Any more ideas? Thanks, Ken

[dovahkiin]

I was just reading someone else having this problem,(Win 7 Home 64bit) and he installed 32gb and only 16gb usable. The person responding told him win 7 home only supported 16gb.

I have have no idea what I have except knowing it's Win 8. Do you know of any limitations of Win 8 64bit?

Thanks again, Ken

[Big_Dave]

Hi,

Post the image as requested.  Also, downlaod CPU-Z and post an image of the memory tab page.

[adevandry]

I am having the same issue, and since the original poster didn't follow up, please allow me to.

I also have (4) 8GB sticks installed. I upgraded my PC from Win7 Home to Win 10 Home.

Please help! Thanks.

[adevandry]

Here is the Resource Monitor screen capture. 

I'm guessing the 8.4 GB under Hardware Reserved is the clue, if not the answer.

So basically, there's a piece of hardware that is using 8GB of memory?  GPU?