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1.5v vs. 1.35v RAM in 2012 cMBP
- Thread starter whdigital
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Too bad samsung doesn't make a 2X8 GB ram
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The problem I have in making a decision on which RAM to get is that Corsair Vengeance Memory doesn't have a 9-9-9-24 latency timing (which is what Apple Ram has). I want to get the absolute fastest, best memory that I will never ever have to upgrade. So, I'm sorta leaning towards the OWC 2x8GB memory which is 1.35v, 1600mhz, CAS latency 9-9-9-24 but it costs $161.99!!
(BTW, link to OWC ram:http://eshop.macsales.com/item/Other World Computing/1600DDR3S16P/)
Latency will not be a difference you'll notice. Even though, it will work on your computer. It depends how obsessed you are with it. I personally didn't care about latency. There is no perceivable difference. Someone correct me if I'm wrong.
I could not find any difference in the latency between the Corsair chips I used on my 2011 MBP and my new 2012 MBP. Since I could not find any difference other than the price (which was a real tangible difference), I just could not see spending more on something that there was a "supposed" difference without proof to back it up.
Agreed. I bought the best for the price I could find. But I did avoid buying the Corsair Value Select which seem to give trouble with Macs.
Just installed my 1.5v 16GB of Corsair Vengeance (CMSX16GX3M2A1600C10) and ran 'memtest all 2' in my new mid-2012 cMBP.
All tests passed with no problems.
Also have a Samsung 830 256GB SSD in the optical bay with 396MB/s write and 466MB/s read. Does that speed suggest the optical bay is running as fast as the HDD bay?
All tests passed with no problems.
Also have a Samsung 830 256GB SSD in the optical bay with 396MB/s write and 466MB/s read. Does that speed suggest the optical bay is running as fast as the HDD bay?
Ran it twice and it passed with no problems. I also haven't experienced any freezing and Kernel panics.
Intel Motherboard Says it supports both 1.5V and 1.35 Ram dimms
The Motherboard HM77 or QS77 intel chipset Mother board has two DIMM sockets and supports the following memory features:
it supports both
1.5V DDR3 SDRAM DIMMs with gold plated contacts, with the option to raise the voltage to support higher performance DDR3 SDRAM DIMMs.
1.35V Low Voltage DDR3 DIMMs (JEDEC specification)
if You Check Cpu specs they say same works with DDr3 and DDR3L
http://www.intel.com/content/www/us/en/chipsets/performance-chipsets/mobile-chipset-hm77.html
http://www.intel.com/content/www/us/en/chipsets/performance-chipsets/mobile-chipset-qs77.html
Two independent memory channels with interleaved mode support
Unbuffered, single-sided, or double-sided DIMMs with the following restriction: Does not support double-sided x16 DIMMs.
16 GB maximum total system memory (with 4 GB memory technology)
Minimum recommended total system memory: 1 GB
Non-ECC DIMMs
Serial presence detect
DDR3 1600 MHz, DDR3 1333 MHz, and DDR3 1066 MHz SDRAM DIMMs. 3rd Generation Intel® Core™ Processors are the only processor family that supports DDR3 1600 MHz DIMMs.
XMP version 1.3 performance profile support for memory speeds up to 1600 MHz
BIOS WILL ADJUST Voltage applied on ram 1.35v or 1.5V according to SPD data on Ram ...
1.35V DDR3 L has same specs as DDR3 Ram other than voltage, it consumes about 1 watt less power in one hour .. Happy for green peace activists
have tested 1.5v rams on 2012 macbook pro the memory are running fine without any problems.
and DDr3 L Rams is Backwards Compatible if you put it in 2011 macbook pro it works on 1.5V
The Motherboard HM77 or QS77 intel chipset Mother board has two DIMM sockets and supports the following memory features:
it supports both
1.5V DDR3 SDRAM DIMMs with gold plated contacts, with the option to raise the voltage to support higher performance DDR3 SDRAM DIMMs.
1.35V Low Voltage DDR3 DIMMs (JEDEC specification)
if You Check Cpu specs they say same works with DDr3 and DDR3L
http://www.intel.com/content/www/us/en/chipsets/performance-chipsets/mobile-chipset-hm77.html
http://www.intel.com/content/www/us/en/chipsets/performance-chipsets/mobile-chipset-qs77.html
Two independent memory channels with interleaved mode support
Unbuffered, single-sided, or double-sided DIMMs with the following restriction: Does not support double-sided x16 DIMMs.
16 GB maximum total system memory (with 4 GB memory technology)
Minimum recommended total system memory: 1 GB
Non-ECC DIMMs
Serial presence detect
DDR3 1600 MHz, DDR3 1333 MHz, and DDR3 1066 MHz SDRAM DIMMs. 3rd Generation Intel® Core™ Processors are the only processor family that supports DDR3 1600 MHz DIMMs.
XMP version 1.3 performance profile support for memory speeds up to 1600 MHz
BIOS WILL ADJUST Voltage applied on ram 1.35v or 1.5V according to SPD data on Ram ...
1.35V DDR3 L has same specs as DDR3 Ram other than voltage, it consumes about 1 watt less power in one hour .. Happy for green peace activists
have tested 1.5v rams on 2012 macbook pro the memory are running fine without any problems.
and DDr3 L Rams is Backwards Compatible if you put it in 2011 macbook pro it works on 1.5V
Last edited:
This is mine also. Can anyone corroborate if there is a improvement on using DDR3L instead of these stock Apple provided RAM ?
Hi guys, sorry to bring up this thread again. any issue with 1.5v DDR3 ram with cMbp 13" mid 2012 now? any reliability or instabilitty issue encountered?
I am planning to use this elpida ram ebj41uf8bdu5-gn-f (from iMac 2012) with my cMbp 13" mid 2012 for ram upgrade?. Notice that this ram is running at 1.5v, here it the specs: http://www.electrobyt.com/index.php?main_page=product_info&products_id=7018#.VWr3ZmAQnVo
Other than the voltage i believe all is matched with the requirement given by apple for ram upgrade of this cMbp 13" mid 2012 (https://support.apple.com/en-sg/HT1270). please let me know if I missed out something. thanks guys!
any issue with 1.5v DDR3 ram with cMbp 13" mid 2012 now? any reliability or instabilitty issue encountered?I am planning to use this elpida ram ebj41uf8bdu5-gn-f (from iMac 2012) with my cMbp 13" mid 2012 for ram upgrade?. Notice that this ram is running at 1.5v, here it the specs: http://www.electrobyt.com/index.php?main_page=product_info&products_id=7018#.VWr3ZmAQnVo
Other than the voltage i believe all is matched with the requirement given by apple for ram upgrade of this cMbp 13" mid 2012 (https://support.apple.com/en-sg/HT1270). please let me know if I missed out something. thanks guys!
1.5 V is the old, pre-Ivy Bridge (2012) standard voltage.
If your MBP uses the Ivy Bridge or newer processor, you should use 1.35 RAM in this MBP. It is more efficient and runs cooler.
If your MBP uses the Ivy Bridge or newer processor, you should use 1.35 RAM in this MBP. It is more efficient and runs cooler.
my MBP is 13" mid 2012 non retina, so yes it use Ivy Bridge. however I noticed that some of the cMbp 2012 user mentioned that they have 1.5v RAM default from apple. so does it means we can use 1.5v for this mbp?
and it will be nice to hear the comment from cMbp 13" mid 2012 owner that changed their ram to 1.5v regarding their macbook reliability and stability after modification. thanks!
Hi guys!
I already know that it would be fine to use a 8GB + 2GB RAM, that not the discussion.
My question is: the 2GB RAM that I have, they are DDR3, and I would like to buy the 8GB RAM DDR3L. is that ok? One DDR3 and other DDR3L?
I already know that it would be fine to use a 8GB + 2GB RAM, that not the discussion.
My question is: the 2GB RAM that I have, they are DDR3, and I would like to buy the 8GB RAM DDR3L. is that ok? One DDR3 and other DDR3L?
Yes, that should work, because the 1.35 V RAM is backwards compatible AFAIK.