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Pros: Excellent warranty service, heatsink is small enough to clear all CPU heatsinks.
Cons: This is my 3rd replacement in less than 2 months. With every pair of these 1866 MHz HyperX Fury Blacks, at least one stick showed errors, in anywhere from 19 minutes to several hours.
The 1st set had one marginally bad stick but showed no errors when I replaced it with an older product that differed only in color. The 2nd set was the same. The 3rd set was the worst, with both sticks showing errors, and sometimes the computer wouldn't even show the boot screen with the Z68 motherboard. This 4th set seems OK but barely. One of the pairs showed an error even when underclocked to 1600 MHz and 11-11-11 @ 1.5V, which surprised me because I thought these were made from chips officially rated for those settings or even 1.35V
Strangely, I've had no problems with my Blue and Red versions of this product, even when used together mismatched (i.e., 1 blue, 1 red), and when undervolting to 1.35V. I don't count unreliable operation at 1.35V as a defect because these products are rated for 1.5V
Other Thoughts: I tested with 2 brands of motherboards with different chipsets, Z68 and Z87, used all the memory sockets. I used sockets in the same channel but changed the order of the 2 DIMMs. To rule out power glitches, I ran one motherboard with these Fury Black sticks, the other with either Samsung 4GB sticks or Red or Blue Furys (in any combination for the latter two, with none coming from a matched pair).
I don't understand why none of the Fury Blue or Red sticks would fail, even when undervolted, but they were made in the first 20 weeks of 2015, while all the blacks were from weeks 30-39.
I don't understand why the quality has gone down, but the high failure rate resembles my experience a decade ago with Kingston ValueRAM PC3200, where the good DIMMs seemed to barely pass testing. I had a long run where for years Kingston RAM was flawless, including in my current hardware.
I'd like to know if the chips in these Furys are officially 1600 MHz or instead are slower. I suspect Kingston used 1600 MHz chips (I've never seen faster on a DDR3 module), i.e., Micron graded -125, Samsung graded K0, Hynix PB, etc., in the recent past but then switched to ungraded or slower chips more recently, and reviewers who removed the heatsinks have found Hynix PB and ungraded Micron chips. Kingston, what did you use for my particular Furys?
Pros: Runs very cool, making heatspreaders completely unnecessary, but heatspreaders are small enough to not block any CPU heatsink
Reviews show the chips are name brand, 1600 MHz, low voltage, which should make operation at 1866 MHz and standard 1.5 volts very reliable
Cons: Overclocked like almost all memory sold now
Other Thoughts: Now that Samsung memory is no longer available, this should be the best choice, especially for reliability.READ FULL REVIEW
Pros: quiet at low and medium power loads (not tested at high loads), able to put out rated power even well above 30 Celcius rated temperature
Cons: Not the finest brand capacitors (Samxon)
SATA connectors do not match those pictured on box but are slightly shorter and may not be long enough for disk drive cradles or a Seagate GoFlex.