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Ivy Bridge memory voltage 1.5 or 1.35v ?


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Hi everyone,


I'm just wondering if 1.5 volts will be suitable for Ivy Bridge CPUs. Or to buy 1.35 volts modules for an example CML8GX3M2A1600C9W. I need no more than 1600mhz (CL9).


I would appreciate any advice.


Thanks in advance,


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  • 1 month later...

Hello again,


I have 3770k and GA-Z77X-UD5H (latest BIOS F7)and 4 x 4 GB corsair vengeance 1600 CL9 1.5 Volts. 9-9-9-24. (red , high profile)


But memory can't run @ 1600 @ 1.5 Volts. I set everything manually , tried with XMP profile - no chance. I run this memory now @ 1333. CPU is not overcloced for now. Everything default.


Also tested @ 1345 and there was a memtest86+ error (only one). So maximum error free was @ 1333. At 1600 system can boot , but OS crash during booting.Memtest also is full with errors with these settings.


I'm wondering where is the problem and how much I can raise the memory voltage safe ?


Thanks in advance

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What is the part number of the modules you have installed? And do you have the latest MB BIOS installed?


Yes , bios is latest - F7 (2012/05/11) Description: Improve system compatibility




Memory type :




High-performance 8GB Vengeance Dual Channel Kit, 1600MHz, 9-9-9-24, 1.5V

Size 8GB Kit (2 x 4GB)

Performance Profile XMP

Fan Included No

Heat Spreader Vengeance

Memory Configuration Dual Channel

Memory Type DDR3

Package - Memory Pin 240

Package - Memory Format DIMM

Tested Voltage 1.5

SPD Voltage 1.5

Speed Rating PC3-12800 (1600MHz)

SPD Speed 1333Mhz

Tested Speed 1600Mhz

Tested Latency 9-9-9-24

SPD Latency 9-9-9-24



***Also noticed that two kits are different versions. One is ver 2.12 , other is 3.xx. But both kits are with same part number.




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Oh I see so you are trying to mix two sets to get 16 Gig is that right?


Yes, I bought 2kits , because I want 16 GB ram .

So specs on both kits are exactly the same only version number is different (I saw that today). Maybe this cause the issue or one of modules is defective... I can try first to rise voltage.


Also until now I had no time to test them separately.

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I have tested kits separately @ 1600 9-9-9-24 , 1.5 Volts.


1. Kit ver 3.19 in slots 3 and 4 (dual channel) -

- memtest 86+ half pass -no errors (*with 16 GB on half pass there was many errors) -. OS can boot , also i've run some heavy tests there was no crash or restart. Seems to be this Kit has no problem. Also need full memtest pass for confirmation but later.



2. Kit ver. 2.12 in slots 1 and 2 (dual channel)

memtest86+ - one pass - there is a one error for now. Still running.


maybe slot issue (1 or 2) or defective module, but still there is a little information to conclude.


I will try to run Kit 3.19 @slots 1 and 2. And also full memtest @ slots 3 and 4 tonight.

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@ 1600 9-9-924 , 1.5V


Kit ver 3.19 in slots 3 and 4 (dual channel) - there is no errors - (3 passes)


but kit 2.12 - has different errors - random (in different passes also different tests 4 or 6 (memtest86+ ver. 4.20)

I have run 3 passes ,

first pass was withouth errors

pass 2 - error at test 4 (one error)

pass 3 error at test 6 (only error)


when I test both kits @ 1600 - there is many errors @ (test 4 and 6 again). So seems to be the problem is with kit ver 2.12.

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I tested this set on another pc - also errors. I returned them to the supplier.


Now I tried with 16 GB ( 2 kits again) but low voltage memory - CML8GX3M2A1600C9W.

Tested and there is no problem - working together 16GB @ 1600 9-9-9-24 ..1.35 Volts.


This is the best option for me because I have large cooler (noctua NG-C14) and now I can use both FAN's


So I think issue is resolved ( i hope).



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My P8Z77-V motherboard says intel specs just say not to exceed 1.65v but thats like how they say not to exceed 1.35v on the CPU, theres probably headroom above that.


My new bios runs memory speed up to 3000Mhz too.

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