Ram Voltage

[Hank1946]

I have a HP Pavillion G7 1261nr. It takes 641369-001 HP memory I have been to several forums with Question and answers and some say that it is 1.5 V and others say 1.35V for the memory. I would like to know which one is correct. Also I would like to know if memory that says 1.35 and 1.5 V compatible will work.  I would like to know if I can use 1 8 Meg card in 1 slot or do I have to use 2 4 meg cards.   

Also what I need to know is if anyone's ram with the correct Voltage will work as long as it is the same specifications? 

4GB, 1600Mhz, PC3L-12800 memory module  641369-001 

[lppedd]

1.35v / 1.5v are meauserements that indicate the voltage required to run the RAM unit.

Compatibility wise you can choose whatever you want. But a lower voltage is preferred for power consumption and overall load-related component stress.

As for the number of slot to use, that's also up to you. Modern PCs support dual channel technology, so a pair of 4Gb modules is theoretically better (faster) then a single 8Gb module.

[REO51ST]

@Hank1946

I do not see a manual for your model so lets just wing it.

@lppedd Compatibility wise you cannot choose whatever you want.

1.35 volt memory will work in laptops that the memory voltage is 1.5v and 1.35v.

1.5 volt memory will not work in laptops that the memory voltage is 1.35v.

The best way to know for sure is to remove the memory you have now and see what you have.

HP Pavilion g7-1000 Notebook PC series - FRU Remove/Replace Videos (AMD)

https://h20574.www2.hp.com/results.htm?SID=5048677&MEID=1B8656A0-B93E-40B0-9431-FB52CCE1EC4F

REO

[lppedd]

@REO51ST I have to disagree. RAM units can be overclocked and overvolted. A motherboard does give to a component as much power as it requires (and as the PSU allows).

Never, ever, seen a motherboard with a fixed voltage target per component.

[REO51ST]

@Hank1946

Let me know what you decide.

I will continue to try and find a manual.

@lppedd

DDR3L is a dual voltage capable memory SoDIMM, which supports operation at both 1.5V and 1.35V.

DDR3L is pin-compatible with DDR3.

DDR3 is a single voltage capable memory SoDIMM, which supports 1.5V operation only.

My tech's have both DDR and  DDRL memory for testing.

On some units as they say you may get away with it but not all the time.

@lppedd sorry but overclocking memory, video, CPU etc. is not something we recommend on the forum.

REO

[lppedd]

@REO51ST I choosed the overvolting example to explain that different voltage values are not a problem for a motherboard.

You can check this answer on SuperUser for a detailed explanation of how DDR3/DDR3L standards are thought.

https://superuser.com/a/564205/755744

Edit: keep in mind the OP laptop uses DDR3 (not Low) memory slots.

[Hank1946]

Hi

 As you can see here the information is all over the place! My problem is with these differing responses which I saw all through my trying to get the right Ram I made a mistake and bought Ram with 1.5V and it only would flash the Cap and Number lock key. So I am returning it and will go with 1.35V  2-4GB - 4096MB memory module PC3-12800, 1600 MHz, DDR3L. I don't like returning items but I flipped a coin and was wrong. 

[lppedd]

Hi! I know that infos are not really uniform.

Basically, for being safe

DDR slot     = 1.35v/1.5v unit

DDR-L slot = 1.35v unit

Also, before purchasing anything it is always better to double check with software like CPU-Z.

It's strage the 1.5v module didn't work. May I have the serial number of the RAM you returned?

[REO51ST]

Sorry @lppedd but the Expert information I gave is uniform.

My Tech's work on thousands of laptops everyday.

The information is from experience not the Internet.

Just like I said and @Hank1946 found out you  can't use 1.5v in a 1.35v slot.

Sorry @Hank1946 but the information I gave was not all over the place.

The reason it seemed all over the place is because someone did not know what they were talking about.

Best regards,

REO

[lppedd]

If you re-read carefully what I wrote and what you wrote, we are saying the same thing. Except I immediately stated that a DDR slot can run whichever RAM unit you want (1.35v/1.5v). And that was the case if the OP laptop, by specification running a DDR 1.5v module.

Specs listed here https://support.hp.com/us-en/document/c03138573