What kind of stress test would you suggest for testing the stability the memory? I have ran some memtest86+ for short times and prime95 for several hours, didn't really want to do 12 hour tests yet until I've settled on settings I'd really like to stick with. Is there something else I could use to really test the memory, or perhaps I should just run memtest86+ for a longer period of time?
Quick - HyperPi32M , longer - memtest86+ in the latest version, Prime95 blend, XTU memory test ( it's based on Prime95) , AIDA64 memory test ( there is stability tab )
Can also try something like WinRAR benchmark with fully covered memory ( pick some large files ) or Intel Burn Test or anything else where you can pick memory size to test. When memory is fully covered or nearly ( liek 95% or something ) then you don't have to test it for long time and 1h should be enough.
I have a set of this RAM and for the price it is freaking awesome value. I ran mine out of the box at 1.2v doing 2400 the stock CL15 timings, no trouble at all.
From yesterday I have bumped the voltage to 1.35v which I am reading is safe, therefore I will now use this voltage for 24/7 usage, takes me to 2666 and timing 14-14-14-32-1T
For a new release and first batch of DDR4, the micron IC is a very sweet little number for budget RAM.
The only advantage I can see for buying more expensive RAM is guaranteed speeds and a better with higher layer PCB, other than that I see little point wasting anymore money.
This is actually high quality memory and I doubt you will see any difference going on a better PCB.
Almost every DDR4 right now is based on the same memory chips. So generally there is 1 Micron, 1 Samsung, 1 Hynix IC in consumer grade DDR4 kits. The main difference is binning for higher clocked kits but as you see, even that isn't so great as most manufacturers are setting really relaxed timings for even these expensive series. I'm not sure if it's because of lack of time or cost cuts.
Probably every Crucial DDR4 is able to run at 2666 clock which is max clock without going to 125bclk strap on most motherboards. Additionally all Crucial DDR4 that I saw could make something like CL13 at 2666 and ~1.35-1.40V.
2666 clock is optimal for daily work even at high overclock of other components. The limiting factor in this case is cache speed, not the memory. Overclocked memory is mainly lowering latency which is kinda high at stock clocks. Bandwidth is mainly limited by CPU cache clock.
When you pick 8 core+ CPU then you see higher effective bandwidth in applications due to multithreading. So tests like AIDA64 will show higher max bandwidth on 8 than 6 cores.