Replacing 1.5v RAM with 1.35v

[Charlie98]

I'm fixing to replace my current 1.5v G.Skill RAM with some Samsung 1.35v RAM... do I need to go into my BIOS and change the settings before I boot into Windows, or should it auto-detect the new RAM and adjust accordingly?

 

[masteryoda34]

Why not just set it to 1.35v?

 

[Ice_Dragon]

If it is the same MHz, I think it would be fine. Are you replacing one or more modules?

 

[Charlie98]

If it is the same MHz, I think it would be fine. Are you replacing one or more modules?

They are both 1600, and I'm replacing a 2x set with a 2x set.

 

[VirtualLarry]

generally, non-1.5v RAM requires you to manually set the memory voltage.

I would swap in the new modules, boot up and go into BIOS, and then set the RAM voltage and reboot. Running temporarily at 1.5v shouldn't hurt them.

 

[Charlie98]

generally, non-1.5v RAM requires you to manually set the memory voltage.

I would swap in the new modules, boot up and go into BIOS, and then set the RAM voltage and reboot. Running temporarily at 1.5v shouldn't hurt them.

The package says 1.35v & 1.5v support but I don't want to fry these things right off the bat, or crash my system.

 

[BFG10K]

The package says 1.35v & 1.5v support but I don't want to fry these things right off the bat, or crash my system.

You won’t, 1.5V is a JEDEC spec and all DDR3 DIMMs have to follow it (1.65V DIMMs are technically out of spec). Lower voltage ones often have their SPD report 1.5V to the BIOS, which is perfectly safe.

Look in your BIOS for an XMP setting as this activates the extended memory profile, which should automatically run them at the low voltage. If you don’t see this setting then just undervolt it yourself.

 

[Charlie98]

You won’t, 1.5V is a JEDEC spec and all DDR3 DIMMs have to follow it (1.65V DIMMs are technically out of spec). Lower voltage ones often have their SPD report 1.5V to the BIOS, which is perfectly safe.

Look in your BIOS for an XMP setting as this activates the extended memory profile, which should automatically run them at the low voltage. If you don’t see this setting then just undervolt it yourself.

I didn't know that.

I had XMP set for my Sniper, and it read my Samsung at 1.5v... so I just went in and set voltage myself. I plan on OC'ing it when I have a little time, but I want to make sure it's stable first.

 

[BFG10K]

I had XMP set for my Sniper, and it read my Samsung at 1.5v... so I just went in and set voltage myself. I plan on OC'ing it when I have a little time, but I want to make sure it's stable first.

I have the white Corsair 1.35V RAM and XMP detects 1.35V for me.

 

[bryanl]

You should be able to use 1.35V RAM even at 1.50V since absolute maximum voltage rating is the same, 1.975V, and 1.35V RAM has official specifications for operation at 1.50V (from 1.425V - 1.575V). Here is a data sheet for a Hynix 1.35V RAM. The relevant voltag information is on pages 11-12:

http://www.skhynix.com/inc/pdfDownl...t/pdf/dram/DDR3L_H5TC4G4(8_6)3MFR(Rev0.5).pdf