G.SKILL Ripjaws 4 Series 16GB (4 x 4GB) 288-Pin DDR4 SDRAM DDR4 2666 (PC4 21300) Desktop Memory Model F4-2666C15Q-16GRR

Pros: Looks good, priced well for DDR4 at this moment, im sure prices will drop soon, took the voltage up to 1.35 and lowered latencies to 13-12-13-27-1T, getting 62GB/sec with a 5820K @ 4.4ghz, Cache frequency is also at 4.4ghz with 1.3v.

Cons: None

Pros: No problems at all on EVGA X99 Classified, correct timings, voltage, and clock from the start. Seems to be rock solid so far, time will tell. I ran the first set of these for over a year and a half, and still going strong, so added a second kit to fill up my mobo's slots. They OC quite well, but they scored better when I tightened the timings and set to 1T vs increasing the frequency. I still think this was the best kit of the series vs the higher and lower frequency models.

Cons: None really.

Pros: -The product looks cool. -The price is decent.

Cons: -Possible RMA on the ram. -Actual clock is 2133.

Overall Review: I've had a few problems with this build since week 1. Many blue screens that point towards the memory being faulty. Did extensive memtesting and had one stick that consistently errors in one slot on the motherboard, but tested okay elsewhere. Spent probably 100+ hours testing these 4 sticks on this motherboard and I cannot conclude whether I need to RMA the mobo to see my problems stopped or RMA the ram. Either way, I'd be down and out without a computer for a while, which just isn't possible.

Pros: This RAM was on the qualified list for my motherboard and the product worked as advertised with the XMP profile with no added fuss or stability issues. I could overclock it even more, but have elected not to for now.

Cons: None

Overall Review: There is more headroom for overclocking and/or tighter timings in this memory, but I'm pleased enough with its performance as-is to leave it in its stock XMP profile settings.

Pros: Ran 2666 XMP right out of the box with no issue. Bumped it to 1T timing with no voltage increase needed. No doubt if I used 1.35v I could run even tighter timings or higher clocks, but the performance is already outstanding at these settings when running quad channel. No stability issues whatsoever. They match my MSI motherboard nicely to boot.

Cons: None.

Overall Review: I've used G.Skill since DDR2 first came out and have always had a good experience whether it was high performance gaming or low-voltage ECO. These were installed in an MSI X99S Gaming 7 motherboard with a 5930K CPU.

Pros: Great memory that is XMP compatible for automatic settings. A lot of people complain about price, but your talking about brand new technology that runs faster than anything else out there (even though this is not the fastest model). This memory also overclocks extremely well! I was able to get this set to clock stable at 3000Mhz compared to the 2600Mhz listed and timings down to 13-14-13-35. May invest in another 16GB kit to add to my quad channel action.

Cons: None. Great purchase and price was great.

Pros: Fast. Works in my ASRock x99 killer microatx board with original v1.20 firmware.

Cons: Its pretty expensive to be on the bleeding edge.

Overall Review: Works great.

Pros: Throw it in your X99 MB and you will boot up, cost effective compared to higher spec'd memory.

Cons: In my motherboard (Asus Rampage V Extreme). I didn't get the performance boost I expected. I think some memory will not overclock that much over stock rating (as opposed to my corsair DDR3 2133 that I overclocked with no problem in my Asus Formula VI to 2400).

Overall Review: How good your CPU is seems to have a relationship of how much actual speed you get from your memory.. The better your CPU, I think the better the memory utilization and memory overclock. The 2666 G, Skill is a "safe" memory to reach average CPU overclocks. For those with better than average CPU's the 3000 is the way to go. I will be returning the 2666 for the 3000 ONLY because my CPU demands it for better performance.