16gb only recognizing 8gb

c0d3ster · Mar 17, 2018

I have an Asus P7P55D-E PRO motherboard with an i5 750, running Windows 7 Home Premium 64bit.
I have 4 sticks of Corsair XMS3 4GB DDR3 1600MHz..

In bios it says I only have 8gb.. Task Manager shows my total is 8183MB and the resource monitor says the same, 8183MB total and installed.. I have checked MSCONGIF to veryify that "maximum memory" is not checked..

I downloaded CPU-Z and it also states that I only have 8GB..

Any ideas on how to fix this?
Thanks!

4745454b · Mar 17, 2018

What does the bios show?

c0d3ster · Mar 17, 2018

Bios only shows 8gb as well...

ss202sl · Mar 17, 2018

what bios version?

boju · Mar 17, 2018

Have you always had 4x sticks?

In Cpuz did you look in SPD tab for JEDEC #1 #2 #3 #4? What does that say?

c0d3ster · Mar 17, 2018

Bios Version/ Date: American Megatrends Inc. 0806, 3/25/2010
SMBIOS Version: 2.6

I have always had 4 sticks, I upgraded from 2x 4gb sticks to 4x 4gb sticks like 2 years ago.. and I had always assumed that I was running 16gb.. After years and years, I just happened to look since it seemed sluggish and I was surprised that it's only recognizing 8.. makes me wonder if it ever really did recognize the 16 when i first installed it..

CPUZ SPD tab indicates that I have 4 slots with the same RAM.. It is strange that it says each module size is only 2048 MBytes... pictures attached below:
Slot 1: https://i.imgur.com/Fj8IVyO.jpg
Slot 2: https://i.imgur.com/NOLOCAn.jpg
Slot 3: https://i.imgur.com/7sUHiEx.jpg
Slot 4: https://i.imgur.com/XE2ETKw.jpg

c0d3ster · Mar 17, 2018

This is the RAM that I'm using: https://www.amazon.com/Corsair-PC3-12800-1600Mhz-Channel-CMX4GX3M2A1600C9/dp/B002LE8D2A/ref=wl_it_dp_o?ie=UTF8&coliid=I22V8NWTWHDAGJ&colid=ZHTC6CUXORFL
Corsair CMX4GX3M2A1600C9 XMS3 4GB (2x2GB) DDR3 1600 MHz (PC3 12800) Desktop Memory 1.65V

This is the motherboard I have: https://www.asus.com/us/Motherboards/P7P55DE_PRO/
Asus P7P55D-E PRO

c0d3ster · Mar 17, 2018

Maybe I'm an idiot?? does the 4GB memory kit (2 x 2GB) mean that it is 2x 2gb sticks??

I had assumed each stick was 4gb.. but i guess I was totally off..

boju · Mar 17, 2018

Those sticks are only 2gb. Set of 2x 2gb. Is that correct?

If so, you only have 8gb total not 16gb as you were led to believe.

c0d3ster · Mar 17, 2018

ok, haha, now that I have that figured out.. what would be a good suggestion to get me up to 16gb?

I play lots of games, and something is bottlenecking.. It's either my CPU or my RAM.. I'm running a Lynnfield i5 750 @ 2.67GHz with a GTX970

boju · Mar 17, 2018

Whats the problem you're having? Might not be memory related.

Could be your cpu bottlenecking the gpu. Check your cpu usage while gaming using msi afterburner. There are youtube vids on how to setup it up and display numbers on screen.

If you want 16gb, 4x 4gb of ddr3 go with 1333MHz @ 1.5v for best compatibility. 1600(OC) might work with 2gbs but not sure about 4x 4gb. Your cpus memory controller is 1333 native so you wont see any difference with 1600.

c0d3ster · Mar 17, 2018

I play lots of Battlefield 1. When the game is running decently, on certain maps, I average about 50 frames per second.. However there are times and other certain maps where my average FPS is about 20-30.. I'll check out msi afterburner

boju · Mar 17, 2018

BF1 is quite cpu intensive, 16gb would probably help the i5 750 be more consistent. 8gb should be enough on newer systems but for an old cpu, might not be in this game.

Have you thought about overclocking cpu?

c0d3ster · Mar 17, 2018

That was going to be my next question as to how stable the i5 750 is to overclock.. I actually bought a CPU cooler.. It's a Cooler Master Hyper 212 Plus.. I've watched a few youtube videos on the process.. you think getting it up to 3GHz would help performance in game and still stay stable? I guess you wouldn't be able to tell me max value, but is that close? Can it go higher than that and stay stable?

c0d3ster · Mar 17, 2018

I've only got a socket 1156, and i've read the i7 860 is probably the highest speed processor with this socket.. Is that true? would it be worth spending the money on a new processor vs to upgrade to 16gb of ram?
Just trying to keep this old system clunking along.. I built it back in 2010 and it's still doing great for what I spent on it and how games have progressed. I've hardly upgraded a thing, but I'm thinking now is the time

boju · Mar 17, 2018

Youd have to look at benchmark comparisons to see if upgrading cpu is worth it and research on ease of overclocking for either cpu.

They might be both easy to overclock. See how far people can push both and at what settings. Nothing too extreme, just a mild overclock of 1000MHz more.

Performance overall should improve with OC. Having more ram would equally be an improvement also.

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