Question 16 GB of memory, but only 8GB work

[Fatboyz_crew]

Hey guys. I recently put together a new gaming rig (with what I could afford) and realized that for some reason only one of my 8 GB of RAM is being recognized, but both sticks of RAM work individually, just not when they're both inside the motherboard. When I put both in, the motherboard's EZ Debug LED has lights flashing in "DRAM" and "CPU", but when I have either stick in by itself it works just fine. I'm a novice in tech so I don't know much, but any help would be appreciated.

Motherboard: MSI Z270 Pro Carbon
RAM: Corsair Vengeance LPX 16GB DDR4 DRAM 3000MHz
CPU: Intel Core i7 7700K

 

[Metal Messiah.]

Are BOTH the memory modules identical in specs ? Have you also checked the Memory compatibility list of your motherboard ? Are you using a daul channel setup ?

 

[Darkbreeze]

Update the BIOS.

Make sure you have them installed in the A2 and B2 slots, which are the second and fourth slots over from the CPU socket.

After updating the BIOS (IF it's not already on the latest BIOS firmware version) and making sure you have them in the A2 and B2 slots, do a hard reset of the BIOS and then check them again to see what's being reported.

Power off the unit, switch the PSU off and unplug the PSU cord from either the wall or the power supply.

Remove the motherboard CMOS battery for five minutes. In some cases it may be necessary to remove the graphics card to access the CMOS battery.

During that five minutes, press the power button on the case for 30 seconds. After the five minutes is up, reinstall the CMOS battery making sure to insert it with the correct side up just as it came out.

If you had to remove the graphics card you can now reinstall it, but remember to reconnect your power cables if there were any attached to it as well as your display cable.

Now, plug the power supply cable back in, switch the PSU back on and power up the system. It should display the POST screen and the options to enter CMOS/BIOS setup. Enter the bios setup program and reconfigure the boot settings for either the Windows boot manager or for legacy systems, the drive your OS is installed on if necessary.

Save settings and exit. If the system will POST and boot then you can move forward from there including going back into the bios and configuring any other custom settings you may need to configure such as Memory XMP profile settings, custom fan profile settings or other specific settings you may have previously had configured that were wiped out by resetting the CMOS.

In some cases it may be necessary when you go into the BIOS after a reset, to load the Optimal default or Default values and then save settings, to actually get the hardware tables to reset in the boot manager.

 

[Fatboyz_crew]

Both modules should be

Are BOTH the memory modules identical in specs ? Have you also checked the Memory compatibility list of your motherboard ? Are you using a daul channel setup ?

The memory modules should be identical, I mean they're exactly the same, and yes when I looked at memory compatibility for my motherboard it does support DDR4 memory and a maximum of 64 GB.

 

[Fatboyz_crew]

Update the BIOS.

Make sure you have them installed in the A2 and B2 slots, which are the second and fourth slots over from the CPU socket.

After updating the BIOS (IF it's not already on the latest BIOS firmware version) and making sure you have them in the A2 and B2 slots, do a hard reset of the BIOS and then check them again to see what's being reported.

Power off the unit, switch the PSU off and unplug the PSU cord from either the wall or the power supply.

Remove the motherboard CMOS battery for five minutes. In some cases it may be necessary to remove the graphics card to access the CMOS battery.

During that five minutes, press the power button on the case for 30 seconds. After the five minutes is up, reinstall the CMOS battery making sure to insert it with the correct side up just as it came out.

If you had to remove the graphics card you can now reinstall it, but remember to reconnect your power cables if there were any attached to it as well as your display cable.

Now, plug the power supply cable back in, switch the PSU back on and power up the system. It should display the POST screen and the options to enter CMOS/BIOS setup. Enter the bios setup program and reconfigure the boot settings for either the Windows boot manager or for legacy systems, the drive your OS is installed on if necessary.

Save settings and exit. If the system will POST and boot then you can move forward from there including going back into the bios and configuring any other custom settings you may need to configure such as Memory XMP profile settings, custom fan profile settings or other specific settings you may have previously had configured that were wiped out by resetting the CMOS.

In some cases it may be necessary when you go into the BIOS after a reset, to load the Optimal default or Default values and then save settings, to actually get the hardware tables to reset in the boot manager.

Thanks for the advice! I'll go ahead and give it a shot.

 

[Darkbreeze]

Did you buy those memory modules together, in a SET, or separately?

 

[lasco]

Hey guys. I recently put together a new gaming rig (with what I could afford) and realized that for some reason only one of my 8 GB of RAM is being recognized, but both sticks of RAM work individually, just not when they're both inside the motherboard. When I put both in, the motherboard's EZ Debug LED has lights flashing in "DRAM" and "CPU", but when I have either stick in by itself it works just fine. I'm a novice in tech so I don't know much, but any help would be appreciated.

Motherboard: MSI Z270 Pro Carbon
RAM: Corsair Vengeance LPX 16GB DDR4 DRAM 3000MHz
CPU: Intel Core i7 7700K

Which version of Windows 10 are you using? 32bit or 64bit?