What sort of mem is this?

Samsung. But not D-die.

How far can you push 9-12-12 on those sticks ? What voltage you used ?

RCD and RP seem weaker than D-die. But RDRD, RFC and the RDWRs can all go tighter.

Perf seems a bit off too, so maybe I have some timings too tight as well.

This is at 2.35V.

D-Die means Hyk0 or HCH9 ?

i cannot compare now ,but can you make a run at 5450 with cpuz and coretemp opened (it was requirement for a contest) as my time like this was 5:31s with 9-12-12 at 2840 mhz.

I have a 4GHz i7 32M run at 2800C8 that was 7m 19.6s.

Best run  at 4 ghz ,on the os i am using from a friend :

I guess yours are stronger with those timings.

See it's not as fast as you would expect. Not sure if it's my OS or timingd set wrong.

Oh, so these are the "weird" Samsung (1Gbit G-die or something similar) that G.Skill were using on their 1600C9 sticks at some point?

I saw some of these do 1400 9-12-12 a few years ago and reckoned they could be a superior choice to 2Gbit D-die due to lower density and hence lower tRFC.

The weird thing is that they were made in 2011.

I see F-die sticks made in 2011, so it's not werid. G-die produced until the end of 2012 AFAIK

G-die DIY available =)

I bought +10 each of  2GB and 1GB G die sticks. 1GB clock much better, but single side = crap efficiency. Might be interesting for freq valid though; I could do 3600MHz (dual channel) without too much effort.

Is it Samsung original sticks?

Yup.

Should put them on a high MHz PCB then