Summary: tRFC for my mobo only goes to 255 (Gigabyte GA-P55A-UD3, rev 1.0, bios F11). I suspect the SPD tries to set a value outside this max range and that's why it doesn't post when that value is set to auto.
Pros: Currently running 2,130mhz after manual bios config. Specifically tRFC = 255, and XMP Profile2. I'm writing this review with the sticks in the machine. Previous review I said I could only get it to post at 1,950mhz max and was running 1,900mhz.
Cons: Had to find the tRFC trick on my own after fiddling with manual bios settings. Found it, so no biggy.
Summary: I've had another set of Gskill in that same machine for 6+ years that's been running 2,000mhz 24/7 for those past 6 years at significantly faster timing (9-9-9-27). This model: F3-16000CL9D-4GBRH (2x2GB).
Pros: Works in a 6 year old machine. Cheap. Fast delivery, got it next day. Writing this review with the sticks in the machine.
Cons: Higher than 1,950mhz, no boot. Current settings 10-13-13-34, 1.6v, 1,900mhz.
Pros: I have been using G.Skill for all my builds including laptop upgrades for the better part of a decade now. This memory kit went into a 2600k build and provided me a stable OC for 5 years. Now I use this same kit in AMD-8350 build. G.Skill makes quality products.