1333mhz on a 1600mhz 4gb *crash*

[stealthTT]

So i have the F3-12800CL9D-4GBNQ 2x2gb sticks of ram that ive had for a little over a year and a half. i reset my motherboard and it now stays at 1333mhz

the F3-12800CL9D-4GBNQ runs only at 1333mhz. i switch to 1600mhz and it will crash after 10minutes or so of my computer being up and running.

I tried switching the timings to 11-11-11-29 and switched between T1 /T2, gave it a little more volatage "1.525" and 1.560v and let the motherboard try auto settings on everything. then tried to change the NB to 1.4v. But still yet i have no idea what to do. I read somewere online some one had a similar problem with this ram and they gave it 1.75v to get it to stablize, but i dont think i should do that.

If any one can help or knows how to please provide input thank you.

Mobo: GA-MA770t-UD3 (just updated the Bios today)
AMD Phenom II 955 (OC to 3.8ghz)
PSU Antec 750W

[Tradesman]

To run 1600 w/ a 955 (if it can do it, many can't) will take am OC and higher voltages of the DRAM. CPU/NB and prob CPU. Normally I suggest a 965 Rev C as the minimum for 1600 sticks. Might take a look at :

http://www.gskill.us/forum/showthread.php?t=7688