Have you thought about reflashing the Bios just incase you have a corrupt bios since you seem fine on the LN2 Bios?
They have a great collection here http://www.techpowerup.com/vgabios/
Sorry (this is an old post) but, I wanted to do a: "follow up".
On my original card: MSI had me flash the BIOS several times. Extract the BIOS and email it to them and after no-resolve; then they sent me out a "Brand New" MSI 770L just about the time driver 331.40 came out. Roughly 3 weeks ago..
Unfortunately the card I received still had issues: 1. It would not run through Heaven 4.0 w/o "micro-stutter" / Driver crash / recover - micro-stutter / driver crash (wash, rinse, repeat). I also had problems running various games: BF3, Cry2 & 3, and Metro 2033 & Metro LL (BFBC, Sniper Elite v2 (only had artifacts, no crashes), Sniper Ghost warrior - no problems, COD Black OPS - no problems).
I kept up w/ the "rant" that the new card also had issues. They first suggested I re-load widows (win/7 64bit), which I had a SanDisk Extreme 240Gb sitting around; so (without wiping out all of my stuff "Samsung 840 512Mb Pro" and doing a "total backup"), I did a complete win/driver install; only loaded Heaven 4.0 and Cry2 & 3 (which I knew I had previous problems with). Still in the same system (see my "Rig sig").
They then asked if it was possibly a problem w/ my PSU & to try the card on another system: so, I pulled the MB out of my old Rig (Antec 900) no way was the Lightning going to fit in there; so, I setup a "test rig" to further test the card.
Test Rig specs:
Intel E8600 3.33Ghz core 2 duo
Crucial 2x4Gb Ballistic / 8Gb total DDR3-10666
Raidmax RX-850SS PSU
Samsung F3 (hd103sj) 1Tb Hdd
Samsung 245t 1900x1080 S-PVA monitor
With the "test Rig" I encountered the same exact problems. Heaven 4.0 stutter / driver not responding / recover / driver crash / recover: Vid link here: http://youtu.be/39iX2FCL16Q
Cry 2 & 3 would play for a few minutes (didn't bother w/ BF3 since the "test rig" is running on WiFi > would take a day or more to install it).
With the 2nd card and the same exact issues I got so frustrated I went out and purchased an EVGA GTX 770 SC ACX. I installed the EVGA (in the "test rig") and "poof" all of the problems went away: Runs Heaven 4.0 w/o any stutter. Runs Cry 2 & 3 w/o any issues (for hours). So, I put the EVGA card back in my original system: (still on the SanDisk Extreme) and no problems.
Finally: I kept the EVGA card in my original system and hooked up my "old" Samsung 840 SSD (BTW: the 840 smokes the SanDisk Extreme / another time - another thread); and even w/ all of my original programs: (MS office 2010, MS security essentials, Malware "anti-malware" bytes PRO, IE 10.0, Firefox, Adobe Photoshop, Ulead Photo Impact, CyberLink Power DVD / Blu-ray, Steam, Origin, Aiessoft Burning software, (I could go on for a few more lines) lots of other software, but: you get the point ! the EVGA card runs everything w/o any problems..!
I today, received a "new" RMA to send back the 2nd card and they are sending out yet a 3rd card. It's been a game of "jumping through hoops" but, MSI is hanging in there w/ sending me out yet another card and daily email support!
At this point: I'm not (that happy) w/ the EVGA GTX 770 SC ACX card: it keeps the "temps low" but, at the cost of some very loud fans. My benchmarks are nearly the same: The MSI 770L running @ 1241-1254Mhz / EVGA running @ 1183Mhz. I get 94.4Fps out of the MSI Lightning and 94.0Fps out of the EVGA card. Neither card running over 63C temps.
Either will run the gams I play @ 1920x1080 / the only difference is the: 1. Sound - EVGA / Loud. 2. MSI - quite but; with random crashes and no resolve in sight.
Not sure if I should just keep the EVGA (until the next "upgrade cycle") sucker works. Take my chances w/ the latest MSI Lightning that they send me. Or, just sell the new MSI 770L (when I receive it) on ebay? At this point between the two cards I've got (with shipping and taxes) more then $900.00 dollars tied up in this problem.