Replacing 1.5v RAM with 1.35v

Charlie98

Diamond Member
Nov 6, 2011
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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?
 

VirtualLarry

No Lifer
Aug 25, 2001
56,327
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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

Diamond Member
Nov 6, 2011
6,292
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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

Lifer
Aug 14, 2000
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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

Diamond Member
Nov 6, 2011
6,292
62
91
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

Lifer
Aug 14, 2000
22,709
2,959
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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.