16gb ram only 8gb installed.

[richii112]

I recently had x2 4gb corsair vengeance ram sticks installed on my computer working fine, one day I noticed my computer was abit slackish so I checked the system information and it only showed 4gb installed. I assumed 1 of the sticks wasn't working so I brought a new 16gb kit to now find only 8gb is installed (Dual Memory) I cannot start the pc with only 1 stick in which makes me believe its not the PCI slot. But I would just like some information.

 

[SkyNetRising]

But I would just like some information.

Did you check by only one ram module installed? Try it in all available ram slots.

Could be bad module, bad ram slot or bent cpu pins.

 

[richii112]

It's an amd FM2A68M-HD+ motherboard, and if I'm gonna be honest I'm not sure what you mean by dram item numbers. They're [CML16GX3M2A1600C9] Corsair CML16GX3M2A1600C9 Vengeance LP 16GB (2x8GB) DDR3 1600MHz DIMM Kit if that's what you mean.

They're a dual kit 8gb+8gb don't work with just 1 ram stick in. Will boot with 2 but only 1 is found.

 

[richii112]

But I would just like some information.

Did you check by only one ram module installed? Try it in all available ram slots.

Could be bad module, bad ram slot or bent cpu pins.

When opening bios, some restarts it will be slotA that's not working then after a few more restarts it might be slotB. There's only 2 slots on my motherboard. Also it might be good to note that is says 'single channel mode' rather than dual. Despite the ram sticks being a dual.

 

[SkyNetRising]

Do the test:

• remove all ram modules first.
  get #1 ram module and put in #1 slot, does pc boot?
  put the same #1 ram module in #2 slot, does pc boot?
  remove all ram modules.
  get ram module #2 and put in #1 slot, does pc boot?
  put the same #2 ram module in #2 slot, does pc boot?

If your pc doesn't boot with #1 ram module in any slot, then module #1 is broken (same for #2 ram module).
If your pc doesn't boot with any ram module in slot #1, then slot #1 is broken (same for slot #2).

Note - installation of ram modules should be done with power disconnected and take precautions to avoid electrostatic discharge

 

[richii112]

Do the test:

• remove all ram modules first.
  get #1 ram module and put in #1 slot, does pc boot?
  put the same #1 ram module in #2 slot, does pc boot?
  remove all ram modules.
  get ram module #2 and put in #1 slot, does pc boot?
  put the same #2 ram module in #2 slot, does pc boot?

If your pc doesn't boot with #1 ram module in any slot, then module #1 is broken (same for #2 ram module).
If your pc doesn't boot with any ram module in slot #1, then slot #1 is broken (same for slot #2).

They're a dual channel kit and need both ram sticks plugged in to boot

 

[SkyNetRising]

They're a dual channel kit and need both ram sticks plugged in to boot

That's not true.
Dual channel kit means, that those modules have been tested and working in dual channel configuration. Dual channel is not a requirement for them to work. They can work independently also.

 

[richii112]

My pc will not boot up with only 1 ram stick in either slots. Only if both are plugged in

 

[SkyNetRising]

My pc will not boot up with only 1 ram stick in either slots.

Did you try that with second ram module also?

 

[richii112]

Yes. Tried them both by themselves in both slots. It'll power up but no image shown etc.

 

[SkyNetRising]

This is interesting.
Can you post screenshot from CPU-Z memory and spd sections?

Also check cpu for bent/broken pins (however this is highly unlikely problem for FM2 socket cpu).

 

[richii112]

Not 100% sure how to post screenshots in this forum but essentially in the memory section it just says 8gb.
For SPD Slot # 1 is blank
Slot#2
DDR3
Module Size;8192MBytes
MaxBandWidth PC3-10700(667MHZ)
Manufacturer Corsair. PartNumber CML16GX3M2A1600C.
Spd ext XMP1.3 Week/year 30/12

JEDEC#1 457 Mhz CAS#Lat 6.0 RAS# to CAS#; 6 Ras#PreCharge;6 TRAS; 17 tRC;22 Command rate--- Voltage 1.5
JEDEC#2 533Mhz CAS#Lat 7 RAS to CAS#7 Ras#PreCharge; 7. tRas;20 tRC;26 Command rate -- Voltage 1.5
JEDEC#3 685Mhz Cas#lat 9.0 Ras to CAS#9 Ras#PreCharge; 9 tRas;25 tRC;33 Command rate-- Voltage 1.5
XMP-1600 800Mhz Cas#lat 9.0 Ras to CAS#9 Ras#Precharge;9 tRAS 24 tRC; 41 Command Rate 2T Voltage 1.5

Sorry about the no screenshot.

 

[SkyNetRising]

Not 100% sure how to post screenshots in this forum

You upload your image to some image sharing site (imgur.com or tinypic.com) and post link.

 

[richii112]

I assumed it was the motherboard but I just got a brand new one replaced (same model) And still. PCI Slot 1A isn't finding any ram. Is there any chance ive some how disabled it in the bios etc and if so how do I fix this.

 

[richii112]

Bump --- Slot 1A Will not work with my 8gb ram stick but will work with my 4gb. Is there any reason its limiting the size of ram for slot 1a only?