MBP 15" early 2011 (MacBookPro8,2) - freeze and 3 beeps after normal boot

Good day.
Month ago I upgraded memory in my MBP early 2011. I bought 2 banks of 4GB Hynix 1333 Mhz(MBP had 2x2GB Hynix banks), installed them and got the first hard freeze with 3 beeps right on the login screen. Since then I got somethink like 15-20 freezes with intervals from 3-4 hours to 1 week and total silence in logs and diagnostic reports.
Note: it boots fine, and freeze occurs during work.
I'm sure it's not a RAM issue because it was tested countless times with AHT, Rember, memtest runned from single user boot, even ASD — all tests passed.
I tried to reproduce the error using Prime95 stress tests, but with no luck — MBP successfully passed 6 hours stress test under 100% CPU and RAM load.
Today MBP freezed 2 times with locked screen and without user activity. Any suggestions?
Additional info:
dmesg - https://gist.github.com/7d3804d11bef38090345
latest log entries right before freeze - https://gist.github.com/c66eaa8c3b08c08c6656
P.S. I'm from Russia, so we don't have AppleCare, only AASPs without needed replacement parts. Also they asks for valid proof of purchase and don't care about Apple ID, serials and stuff.

yumitsu,
3 beeps MEANS its a RAM problem or RAM related problem. There is no doubt about this. Make sure RAM is seated properly. Reseat it if necessary. Also make sure that the DIMM slots don't feel loose as a slight jolt is probably enough to dislodge RAM and make your machine expererience these issues.
Have you tried putting back the original 2 x 2GB RAM that originally shipped with your machine back? If everything starts working normally with the original RAM, then you isolated the issue to the 2 x 4GB Hynix RAM.

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