发布于 2012 年 6 月, 型号 A1278. Intel 处理器,支持 Turbo Boost, 最多 512 MB DDR5 显存

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Ram Upgrade: can I use DDR3L instead of DDR3?

Last year I upgraded my macbook ram from 8gb to 16gb. (It's a Macbook Pro 13'' mid 2012 - model A1278)

It originally came with 2x4gb DDR3, and I replaced with 2x8gb DDR3L, as advised by a friend and after checking several online foruns.

About 6 months later the macbook died and I had to get the logic board replaced.

The thing is: "the guy" at the repair shop said the ram was probably the cause, because using a low-voltage ram on the system originally designed to use DDR3 ram caused the system to have "extra energy running around" and it fried the logic board.

I checked around online in all kinds of foruns and didn't find anyone talking about it. Lots of posts says it's fine to replace DDR3 with DDR3L. My friend still uses his macbook and nothing happened.

Has anyone heard about this?

The macbook is currently using its original DDR3 ram, but I still have the 2xDDR3L with me and I don't know if I should replace it again.

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The guy you spoke too doesn't know what he's talking about. Basically you can use either.

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.

So in this case the RAM will be running at 1.5 volts as your system does not offer a low voltage option.

With that said... You could have a bad module or the module was not properly installed.

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Overall I agree with @danj regarding everything he said, except that he's too polite because "that guy at the repair shop" is a moron and there is no "extra energy running around.."

Find a new repair guy. As the saying goes, "if you can't dazzle 'um with brilliance, baffle them with BS."

Thank you!!!

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It seems that some 2012 13” mbp run ddr3L perfectly and some other don't: they run the ddr3L at 1,5v or don't run them at all. The only way to know is to check what was installed originally:1,35 or 1,5.

Then, an Apple store guy told me that some 2012 mbp accepted ddr3L but had ddr3 installed originally because Apple had his ddr3 stocks to finish… what a mess.

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I think The moduler WAS NOT propery

installed and there were arcing which ultimately destroyed your mother-board. Always check what the manufacturer states in the specifications.

I use older (>5 years) Toshiba Satelliter laptop PCs, I always check the "specs"!

Two of my Toshiba C850-10X pr C850-12Z uses originally DDR3L, so there is quite OK to exchange 2GB /4GB origi-nally installed DDR3-SODIMM with

1 x 8GB or 2 x 8GB DDR3L SODIMM.

Older Laptops as f.ex Toshiba C650 /660 /670 (D) shall ONLY be retrofitted with what manufacturer

has stipulated in the specifications.

OBS! Be ABSOLUTELY SURE THAT THE MEMORY CARD IS BOTH ELECTRICALLY AND MECHANICALLY CORRECT MOUNTED, SO NOT ARCING IS POSSIBLE!

FIRSTLY

FIRST UNPLUGG THE ANY UNIT FROM REGULAR 115V/230V NET OUTLET! WAIT ABOUT 20-30 MIN!

SECDONLY:

THEN ALWAYS USE ANTISTATIC BRACELET!

OBS! NEVER TOUCH THE MEMORY CONTACTS! OBS!

THIRDLY:

CHECK THE MEMORY STICK MOUNT EVERY WEEK - SINCE WARMTH AND MECHANIC HANDLING OF THE LAP-TOP MAY CASE MEMORY CARD TO BE DISLODGED FROM ITS CORRECT MOUNT! [arcing might kill memory and as well as laptop motherboard/cpu.]

Also warmth can and will make the module to "disconnect" after a while!

FOURTHLY: USE ONLY KNOWN

AND REPUTABLE MEMORY

MANUFACTURERS MODULES,

even if they might cost You consi-derably more!Believe me: It's wort it!

Always check what the laptopmanu-facturers sight for specifications!

73's de Gunnar sm6oer

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You should go check a psychiatrist you know.

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