The RAM specs (power use) are generally similar; however the 1.35v version should be
assuredly better for use in a battery powered products where consumption of a charge
may be a tiny bit less with a 1.35v verses a 1.5v. Some charts of replacement or upgrade
parts will show if the later spec would include reference to the L series lower power chip.
Sometimes a vendor or maker specs (regarding their part numbers) will show one number
of their part as being correct to use in a specific computer; while another source of same
brand may offer a different part number. This can be confusing; and so when considering
an upgrade (crucial chips) I found this was the case. I contacted crucial directly and asked
about the part numbers and the vendors; they assured me the other reseller was one of
their trusted vendors and the part number differences were actually the same spec part.
Of course, some of these chips may be better for a portable computer where battery life
could be enhanced (depending on other user-settings and tasks set before the Mac) or
if the computer is a desktop model, the power consumption may not be as big a deal.
I found my desktop computer could use either a version for laptop, or one said to be for
a desktop. My thinking was the low-power chips would generate less heat; and heat is
an indicator of wasted power. Also extra heat can shorten life of other computer parts.
Either chip could be adequate and in some cases, a 1.5v chip may use less and still be OK.
Hopefully whatever you've chosen is the correct spec chip and either company will guarantee
the parts; just be sure the numbers are the right ones for your version computer. Ask them.
Contact the crucial company and provide the part number and ask if they can verify it to be
the correct part for your computer. They may offer a different part number at crucial.com.
Good luck & happy computing! 🙂
