I've got four 8gb modules
. On my P8Z77V-LK with 3770K, they don't even start above 1333 MHz (e.g., with their own XMP profile [email protected]
1.5V set in BIOS). Other DIMMs like Corsair LP 4x4 1600 work just nice on this system.
As for 1333, these so-called 1600 modules are very stable at 7-7-7-18-1T @1333 if set to 1.6V with good air flow around (12 hrs of prime95 in 8-thread blend mode).
Most probably, it's all MB-related. In any case, I'd suggest to check up their forum (e.g. here
) before purchase, and use the "scan" program at their site which tests if your MB is compatible.
So, I contacted their support and got an immediate response as of the voltages:
Thank you for contacting Crucial. Your Smart Tracer modules are rated for 1.5V, with a tested tolerance of 0.75V variance, which makes 1.58V the highest you can go without going outside of the official specifications. As you noticed the modules will still run at a slightly higher voltage, but you're right to be concerned about the long-term effects the higher voltage will have on the memory.
An alternative to increasing the voltage is to loosen the timings by increasing the numbers slightly. You may need to experiment by changing them gradually and one at a time, until you reach a stable configuration. Looking at the motherboard specifications, DDR3-1600 is the highest speed the P8Z77V motherboard supports without over-clocking, and that means you may need to tweak the settings a bit more than you would need to do at lower speeds