DDR3 + DDR3L compatible?

[culzone]

So I had kingston hyperx black 1866mhz 4gb x2
and 1 year later I wanted to buy more and I did but I found out that they were DDR3L the other ones.
Does this matter?
DDR3 runs at 1.5v and the DDR3L runs at 1.35v

 

[algorithmbreaker]

So I had kingston hyperx black 1866mhz 4gb x2
and 1 year later I wanted to buy more and I did but I found out that they were DDR3L the other ones.
Does this matter?
DDR3 runs at 1.5v and the DDR3L runs at 1.35v

DDR3L will work in DDR3 Slot but not the other way.

 

[InvalidError]

Short answer: no.

Long answer: mileage will vary but in general, over-volting things by 10-15% all the time does at the very least increase power consumption, temperatures and the likelihood of failure.

 

[culzone]

So I had kingston hyperx black 1866mhz 4gb x2
and 1 year later I wanted to buy more and I did but I found out that they were DDR3L the other ones.
Does this matter?
DDR3 runs at 1.5v and the DDR3L runs at 1.35v

DDR3L will work in DDR3 Slot but not the other way.

I mean I got 2 different types of memory sticks (DDR3L and DDR3) do they work properly together?

 

[bigpinkdragon286]

Memory will often be compatible for more than one voltage level. If both sets of memory modules can run at a compatible voltage level, you should be fine, but it's hardly recommended to go this route. The voltage difference between DDR3L and DDR3 can easily make the memory modules completely incompatible, but it's not an across the board guarantee.

Thankfully, JEDEC standards say that DDR3L modules have to be backward compatible with the DDR3 standard, so most DDR3L modules should work fine at DDR3 voltage levels. Make sure your modules are JEDEC compliant, however, before assuming they follow the standards.

I would suspect it would be safer initially to attempt under-volting the DDR3 at 1.35V rather than trying to over-volt the DDR3L to 1.5V, as the worst case scenario would be the RAM malfunctions, but doesn't incur any electrical damage. When running with less voltage, you may have to increase the timings and lower the bus speed on the RAM modules that are being undervolted. The 1866 MHz modules may only be stable at 1333 if undervolting. If you can even boot the system with both sets, I would highly recommend running overnight memory tests to ensure they are all stable.

If you can't stably run both sets of RAM modules at 1.35V, you can still attempt to run the system at 1.5V. As InvalidError points out, the long term consequences are increased power consumption, but in the case of RAM in a desktop system, I doubt you could easily quantify the resulting difference.

MemTest86

Memtest86+

Windows Memory Diagnostic

 

[Pinhedd]

So I had kingston hyperx black 1866mhz 4gb x2
and 1 year later I wanted to buy more and I did but I found out that they were DDR3L the other ones.
Does this matter?
DDR3 runs at 1.5v and the DDR3L runs at 1.35v

All DRAM manufacturers cut their DDR3L DRAM chips and DDR3 DRAM chips from the same silicon. The only difference between them is that the DDR3L DRAM chips have passed low-voltage operating tests. So the answer is yes, DDR3L will operate at 1.5 volts perfectly fine. However, mixing and matching memory is always a bit of a crap shoot, but fortunately it works just fine the majority of the time.

 

[InvalidError]

All DRAM manufacturers cut their DDR3L DRAM chips and DDR3 DRAM chips from the same silicon. The only difference between them is that the DDR3L DRAM chips have passed low-voltage operating tests.

DDR3 and DDR3L are not necessarily cut from the same wafer: they may use a slightly different process and macro designs tuned for lower voltage at the expense of higher latency just like Intel and other chip designers do when they have designs tuned for mobile where power is at a high premium and others for desktop where power is only a secondary concern.

Over the past year or so, DDR3L may also mean sub-20nm dies made on the same process as DDR4.