mixing 2x4GB PC1300 1.5v sticks with 1x8GB PC1600 1.35v stick?

[paradigmGT]

Would it be OK to mix the following memory?
2 sticks of Corsair XMS 4GB DDR3 1333 (9-9-9-24, 1.5V) with 1 stick of Crucial Ballistix 8GB DDR3 1600 (9-9-9-24, 1.35v).

I am concerned that it will be an odd 3 stick combo (total of 16GB) with different voltages and speeds.

Motherboard is an ASRock Z77 Extreme4 LGA 1155

 

[tweakboy]

This is headed no where. Just forget it and buy a 16GB kit .. 2 x 8GB for 70 dollars
and youll be running dual channel.

 

[Agent-A01]

I wouldnt do it, as you lose half your memory bandwidth by going out of dual channel mode.

 

[holden j caufield]

it will run at the lowest speed. You can combine and run memtest

 

[fffblackmage]

I don't have any problems with the idea of mixing speeds and timings, because I would just manually set them somehow to make it work out (they'd probably be ok at 1333MHz), but the only problem I see is running ram that require different voltages. Overvolting the 1.35V ram doesn't sound like a great idea, since I don't know if that might shorten its lifespan or cause it to overheat. And the 1.5V kit probably won't be stable with less voltage.

Assuming everything else worked out, you'd just end up with the 2x4GB kit running in dual channel mode and the one 8GB stick would run in single channel mode. It's not ideal, but having extra ram running on single channel mode is still better than not enough ram.

 

[john3850]

The 2x8 DDR3 1600 Ballistix VLP I have came with a 1.35v and a 1.50v XMP default 1.3 profiles.
The mb defaulted to the 1.50v XMP I then set it up manually to 1.4v 1866.

 

[ikachu]

Regardless of the other considerations, operating 1.35V DIMMs at 1.5V should be fine per JEDEC (from the SPD spec):
"1.35 V LV DDR3 devices are required to be 1.5 V operable."

The BIOS should automatically set your DDR rate to 1333 (highest common supported speed) and your voltage to 1.5V (lowest common supported voltage).

 

[tweakboy]

All ram must share same voltage. So your 1.5v ... alto that other RAM is 1.35v

and just downclock and you should be good. gl