DDR3L or normal DDR3?

Double Data Rate Small Outline Dual Inline Memory Module (DDR3) format
- 67.6mm x 30mm (1.18 inch)
- 2 GB or 4 GB
- 204-pin
- PC3-12800 DDR3 1600 MHz type RAM

Additional notes: For best performance, fill both memory slots, installing an equal memory module in each slot.

I should point out this listing is a bit dated as this series can support 8 GB modules so you can go up to 16 GB of RAM.

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Thansk! So just to be clear, this is the 1.5v 'normal' DDR3? :)

由 Tim 完成的 2016年10月8日

DDR3L is a dual voltage capable memory DIMM, which supports operation at both 1.5V and 1.35V. DDR3L is also pin-compatible with DDR3.

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

Basically you can use either but the older DDR3 is cheaper.

由 Dan 完成的 2016年10月8日

Thanks a lot!

由 Tim 完成的 2016年10月8日

Update: Time marches on ... Today finding older DDR3 is difficult and besides the price of DDR3L RAM has dropped and is often cheaper!

由 Dan 完成的 2019年7月3日

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Thansk! So just to be clear, this is the 1.5v 'normal' DDR3? :) — Tim
DDR3L is a dual voltage capable memory DIMM, which supports operation at both 1.5V and 1.35V. DDR3L is also pin-compatible with DDR3.

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

Basically you can use either but the older DDR3 is cheaper. — Dan
Update: Time marches on ... Today finding older DDR3 is difficult and besides the price of DDR3L RAM has dropped and is often cheaper! — Dan

NebukadV @nebukadv 声誉积分: 59 4 1 · Answer 1 · 2021-11-16T10:02:12-07:00

I would not agree that the best answer is to consult Apple, since Apple is famous for not letting ppl know, how their devices actually work. You see that already in the short portion, Dan posted here:

The Maximum memory capacity of these machines is NOT 8 GB. 16 GB works just fine, Apple just never tested it so they never shared this information.

As for DDR3L and DDR3:

I also was not sure, so I tested it:

Both work without a problem, so you can install both.

As for, if it makes a difference: The Power Rail for the RAM is called "PP1V5S3_DDR", stating it as a 1.5 V rail. I installed DDR3L modules and still the voltage on the rail was 1.506 V. So even though the modules could run on 1.35 V, the logic board always runs them on 1.5 V since that is what it's designed for. This was tested with the most recent Catalina update, so with the most recent EFI.

This is not rocket since, but I could not find this definitive answer anywhere on the web, so I checked for myself and posted it here.