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Can I use DDR3 "as though it were" DDR3L ?

T

TheDarkKnight

Senior member
I am wondering if I can use DDR3 1.65V memory in a Haswell motherboard/CPU setup. Will the chips be fried or will the system auto-configure the voltages of the memory in the system down to 1.35V?
 
I highly doubt that would work. The SPD would be set for 1.5v or 1.65v, and even if the board auto-configured for 1.35v, chances are that the RAM would simply fail to work properly at those voltages.

Other than the Samsung "magic RAM", of course.
 
It depends at what Frequency and Timmings you want to run it at, and what the actual DDR3 ICs are. I managed to run my Hynix MFR @ 1.35V 1333 MHz 8-8-8-24 and were rock solid, but they don't do as well as some Samsung ICs at low Voltages. Check this Thread for Frequency-Voltage-Timming scaling on a few ICs.

Also, by default, nearly every DDR3 Memory Module should have in the SPD Table several safe JEDEC standard settings, including 1.5V, like this. As Desktop Haswell officially supports 1.35V and 1.5V DDR3, any half-decent Memory Module shouldn't have issues. It won't boot at 1.65V unless you purposefully enable the XMP Profile.
 
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