Quote Originally Posted by Daveburt714 View Post
Hey wez...
Our chips seem to have come from the same batch (maybe even the same wafer ). Mine is a 1237 PGN, Serial #0126.

I've been pushing the limits of stability quite a bit.
Although it seems daily stable @ 4.95/1.50v (a # of different stress tests), I've since had a few quirks when encoding some HD video...

Even though temps are in check my chip gets a little squirley whenever my Vcore is >1.485 (ambient water).
I assume it's electron-migration... Just wondered if you've noticed the same thing with your chip?
I've rolled my OC back to 4.83/1.48125 and the encoding stability problems seem to have went away...

Don't get me wrong!
I can push it up to 5.3+ Ghz with voltages >1.525 and pass a lot of benchmarks, but real stability fades ~1.485v.
Maybe I just didn't get the best sample... Wouldn't be the first time...

Hah, wafer brothers...

I'll start with some ranting.. mostly motherboard related.
Haven't focused too much on core clock with this chip yet, mainly because its nothing special in that area.
Have noticed that I get ht ref fluctuations (~3), which sort of make things a bit tricky to dial in.
Vcore is pretty wild, and in the first place I have to over compensate a lot to get set value at idle. But it will also increase by ~0.04v under load.
Set it up for ~1.6v in bios, get 1.5v at idle and 1.54v under load.
Now, its very much workable with some patience, and its mostly when really pushing it that these small issues pose a problem. But thats where i like it..so yea..

Daily non prime stable limit is pretty much what you are getting (4.95ghz). Funny thing is, passing cine at over 5ghz have proven to be a real challenge. More and more my board seem to be the culprit, but its still hard to say. Could just as well be a super picky core that just dont want to play nice.

If I want it stable in prime, ~4.8ghz is the limit, give or take. (Vcore around 1.5v, not 100% dialed in). My cooling just yawns its way through anything I've tried. High clocked 8 core chip with 1.56vcore and 1.36v cpunb, and load temp is barley reaching above 55C? My 8120's would have melted a long time ago lol. Socket and cores show similar values, so I dare to say temp is accurate enough. All voltages are measured with dmm.

I've started using x264 fhd benchmark for a quick way of testing, and its not that far off from what it would take in prime. So I'm not surprised you are seeing issues with encoding
You could very well be onto something with the chip not liking high vcore. Your chip have a high VID as well? (mine is 1.375v).