DDR2 PC2-6400U 800Mhz

[the.prussian.lord]

I have an older PC with a Gigabyte GA-MA770-S3 Rev 1.0 Motherboard (AMD 770 + SB600 Chipset) It has a AMD Phenom II X4 965 CPU. I was running 6GB of mismatched RAM using all 4 slots and the PC ran fine. I upgraded to 16GB of Samsung RAM and I can only seem to 8 of it to work at any given time and only if I use the first 2 Slots. If I try to ANY more ram, I get boot issues, Windows fails to start properly. All 4 ram Modules are matching "4GB 2rx4 PC2-6400u-666-12-E3" but for some reason I can't seem to get the PC to recognize the full 16GB or basically anything beyond 8GB. The manual says the motherboard will support 16GB and I am running Windows 10 Home. https://www.gigabyte.com/Motherboard/GA-MA770-S3-rev-10#ov <~ Link to the MOBO Also here is a link to the Memory ~> https://www.ebay.com/itm/272910196951 and yes I bought it on Ebay don't judge me 😉

 

[GhislainG]

High-density modules 2Rx4 may not be fully compatible, but they were inexpensive. Before ordering did you read this?
http://www.tomshardware.com/answers/id-3002794/memory-compatible-ma770-ud3.html

 

[the.prussian.lord]

High-density modules 2Rx4 may not be fully compatible, but they were inexpensive. Before ordering did you read this?
http://www.tomshardware.com/answers/id-3002794/memory-compatible-ma770-ud3.html

Damn at those prices I might as well build a new Computer. $280 for ram is crazy especially DDR2, I know it's old and not mainstream any longer *sigh* The 16 GB of DDR3 2133 I bought for my other PC back in 2015 was only $146 *Sigh again*

Okay but 2 of the 4 gig sticks work flawlessly, It's only when I use the other two DIM slots. I know the slots work because I was recently using all four slots. I put the old memory in just to check and they do. Maybe a bios setting issue? There has to be a way especially if the other sticks are working

 

[GhislainG]

Try increasing voltage a bit as that may help.

 

[brispuss]

Increase DDR2 Voltage by 0.05 V in BIOS. But don't exceed around 1.95 V.

If still have problems, could increase NorthBridge voltage (also) by 0.025 V.

 

[the.prussian.lord]

Increase DDR2 Voltage by 0.05 V in BIOS. But don't exceed around 1.95 V.

If still have problems, could increase NorthBridge voltage (also) by 0.025 V.

This did not work 🙁

Is there anything else that I could try?

 

[brispuss]

Could you please check and provide the following details -

1) how many memory chips are there on each module (either 16 or 32)?

2) what is the memory part number printed on the module labels (might start with M)?

3) what is the memory chip number printed on each chip (might start with K)?

Thanks.


EDIT: The reason for asking these questions is that the 4 x 4 GB modules are suspected to be counterfeit!

 

[the.prussian.lord]

Could you please check and provide the following details -

1) how many memory chips are there on each module (either 16 or 32)?

2) what is the memory part number printed on the module labels (might start with M)?

3) what is the memory chip number printed on each chip (might start with K)?

Thanks.


EDIT: The reason for asking these questions is that the 4 x 4 GB modules are suspected to be counterfeit!

1) how many memory chips are there on each module (either 16 or 32)
16

2) what is the memory part number printed on the module labels (might start with M)
M378T2953EZ3 - CF7

3) what is the memory chip number printed on each chip (might start with K)
K4T51083QE

 

[brispuss]

Thanks for the details!

These four modules are actually 1 GB capacity and NOT 4 GB capacity. So the total memory from these four modules is just 4 x 1 GB = 4 GB.

 

[GhislainG]

Thanks for the details!

These four modules are actually 1 GB capacity and NOT 4 GB capacity. So the total memory from these four modules is just 4 x 1 GB = 4 GB.

If the system detects 8 GB when 2 modules are installed, then they can't be 1 GB modules. Based on the IC specs, the modules should be 2 GB with 16 ICs on only one side and the pictures on eBay show 16 ICs on each side (32 ICs per module). The system can't handle more than 64 ICs, but that kit includes 128 ICs.

 

[brispuss]

Google the respective quoted part numbers to verify (K4T51083QE and M378T2953EZ3).

If the quoted part numbers are correct then -

for memory chip part number K4T51083QE, each memory chip is 512 Mb (Mega bits). Capacity of each memory chip in MB (Mega Bytes) is 512 Mb ÷ 8 = 64 MB. There are sixteen memory chips on each module, therefore there is a total capacity of 64 MB x 16 chips = 1024 MB, or 1 GB.

for module label (M378T2953EZ3), Googling shows this as being for a 1 GB module.

If the computer is showing each of these modules as having a capacity of 4 GB instead, then that seriously contradicts the part number and labeling (which indicate 1 GB).

Therefore, either the labeling on the memory chips and the modules are incorrect (which in turn suggests counterfeit parts), or the computer is for some reason misreading the 1 GB modules as being 4 GB (unlikely).

Bottom line, these modules are suspected to be counterfeit.