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[OFFICIAL] FX-8320/FX-8350 Vishera Owners Club - Page 626

post #6251 of 67259
I can boot up flawlessly even at 5.0, 1.47 Vcore, 1.35V CPU NB VID, rest of the settings are the same as described in my previous post.
Its not even nowhere near close to stable.

At least it should be stable at 4.5, or not?
Help, what am i doing wrong?
post #6252 of 67259
Thread Starter 
Quote:
Originally Posted by os2wiz View Post

Quote:
Originally Posted by KyadCK View Post

Different batch numbers overclock differently, some batches are good, some are bad.
http://www.overclock.net/t/1331219/fx-83xx-data-collection-thread

Kyad has anybody actually studied if there is any significant performance differences in chips within the same batch?

With PD? Nope. Not enough samples.

With others? Wouldn't be a very good way to compare chips if they did.
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post #6253 of 67259
Quote:
Originally Posted by KyadCK View Post

Having just watched it, it's an incredibly good movie. It's basically a musical I'm willing to watch. biggrin.gif
Anyway, CPU doesn't like 5.2Ghz with just a VCore bump, not with the wussy 1650rpm fans they included. IBT still makes it get too hot (understand we're talking 1.6-1.625v here, as that's what it took to bench at 5.2 before) and it crashes (although not until the 3rd pass begins, when it's had time to warm up), but I bet it'd be acceptable for some PlanetSide2 or DVD ripping.
I also need to decide what to do with my H100... I don't have another case that it would fit "nicely" in. Anvil (HAF XM) is fine with it's H80, and I really don't want to screw up it's fan config. I could put it in CloudNine (HAF 912) I guess, in front of the HDD bay with the front fans, if the hose will reach. Or I could sell it, but I have no idea where the Intel stuff for it is, and the Liquid Ultra doesn't seem to want to come off completely. Decisions decisions... thinking.gif

I have an H100 also. I am wondering if it would keep temps lower if I replaced the 2' stock 120mm fans with 2 120mm Noctuas NF-S12B ? If it won' lower temps but will be as good with less noise that would be a viable option for me as well. I have 2 of them new in the box sitting under my computer desk. Just want to make sure the effort of install is not a wasted venture , as frail as my health is these days, I can't afford spinning my wheels.
Edited by os2wiz - 12/28/12 at 1:18pm
post #6254 of 67259
Quote:
Originally Posted by Frozenstar View Post

I can boot up flawlessly even at 5.0, 1.47 Vcore, 1.35V CPU NB VID, rest of the settings are the same as described in my previous post.
Its not even nowhere near close to stable.
At least it should be stable at 4.5, or not?
Help, what am i doing wrong?
There is a big difference between the voltage these chips need at idle and what they need to be stable at 100% load.
The 1.47 for 5 ghz at idle is about what mine will do, but in order to be stable for IBT @ 5Ghz it will need 1.53 volts minimum.
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post #6255 of 67259
Quote:
Originally Posted by Frozenstar View Post

I can boot up flawlessly even at 5.0, 1.47 Vcore, 1.35V CPU NB VID, rest of the settings are the same as described in my previous post.
Its not even nowhere near close to stable.
At least it should be stable at 4.5, or not?
Help, what am i doing wrong?

Just thought I'd try to get the ball rolling for you.

Why 1.35 cpu nb v? 1333 ram and stock (i assume) cpunb shouldn't need it that high. Also, 1.45 - 1.49 seems like a large fluctuation. Decent psu? llc enabled? Did you do any stability testing at stock, or at least lower speed cpu before beginning to oc?
post #6256 of 67259
Quote:
Originally Posted by KyadCK View Post

With PD? Nope. Not enough samples.
With others? Wouldn't be a very good way to compare chips if they did.

sure enough. I was hoping there may be some engineering info on this question that is in the public domain. It might be useful to us here. I would be great if someone here who may have contacts with AMD may be able to have them do a podcast
Or interactive forum for a set day and time that would allow us to ask those arcane but interesting questions we are not sure about to someone with a much wider database of knowledge. Do you think that may be feasible for the Vishera Owners-Users Club?
Edited by os2wiz - 12/28/12 at 1:34pm
post #6257 of 67259
Quote:
Originally Posted by ComputerRestore View Post

The difference between the CPUs (even same model) is very surprising.
Just between the two 8350's that I've used running at the same settings @ 4.5Ghz
CPU 1 - (Stock VID 1.332v) IBT @ 1.356v max temps 52 Celsius Core Temp
CPU 2 - (Stock VID 1.284v) IBT @ 1.356 max temps 70 Celsius Core Temp
But.... CPU 2 can run 4.5Ghz IBT @ 1.338 max temps of 59 Celsius Core Temp. So I think it could OC much better with better cooling.
Another thing I noticed between the two CPUs, was that my 2nd one, with a later Time Stamp of 1244 has a bit thicker IHS (taller). I didn't measure the thickness of my first CPU before it went RMA'd, but the difference is fairly obvious.

My 8350 has a Time Stamp of 1244 too and will reach 70c core temp while running OCCT with the stock cooler. What kind of cooler are you using on your 1244 chip? is this the chip you RMA'd? Im wondering if I should try and return mine.
post #6258 of 67259
Thx! biggrin.gif

As i read, these voltages are the max on air. So if i want to OC to the max possible, why use less?
Ofcourse, i tried lower speeds, starting with 4.4, and having hard time to get it stable even at that speed. It barely even reaches 50C under load. (OCCT), it just shuts down after random time, or drops an error message.
I have to remove power cable, wait some seconds, plug it back in, and then it turns back on.. Otherwise it wont even start after such a shutdown.

LLC is on Extreme.

My PSU didnt have a problem running an i7@4137 with 2x6970 in Crossfire, i dont think its the problem now.
post #6259 of 67259
Quote:
Originally Posted by Frozenstar View Post

Thx! biggrin.gif
As i read, these voltages are the max on air. So if i want to OC to the max possible, why use less?
Ofcourse, i tried lower speeds, starting with 4.4, and having hard time to get it stable even at that speed. It barely even reaches 50C under load. (OCCT), it just shuts down after random time, or drops an error message.
I have to remove power cable, wait some seconds, plug it back in, and then it turns back on.. Otherwise it wont even start after such a shutdown.
LLC is on Extreme.
My PSU didnt have a problem running an i7@4137 with 2x6970 in Crossfire, i dont think its the problem now.

So it doesn't sound like psu, or temp. But if its unstable even at lower speeds, maybe it isn't cpu overclock or voltage. RAM? What is cpunb frequency? Also, if you are running it stock, why bother pushing more volts through cpunb? I had a 1055t (different animal of course) but it sometimes seemed like there was a strange interaction between cpu and cpunb. I'd back off cpunb volts and freq to stock.

Anyone else have any ideas?
post #6260 of 67259
Quote:
Originally Posted by Jerm357 View Post

My 8350 has a Time Stamp of 1244 too and will reach 70c core temp while running OCCT with the stock cooler. What kind of cooler are you using on your 1244 chip? is this the chip you RMA'd? Im wondering if I should try and return mine.

The CPU that I RMA'd was the cooler running one (Article I wrote up in my Sig)

The cooler I'm using on this 1244 CPU is a Zalman 9900A. It hits 70 Celsius @ 4.5Ghz though. At Stock settings it only hits 50ish (which is still kinda high IMO)
Quote:
Originally Posted by Frozenstar View Post

Thx! biggrin.gif
As i read, these voltages are the max on air. So if i want to OC to the max possible, why use less?
Ofcourse, i tried lower speeds, starting with 4.4, and having hard time to get it stable even at that speed. It barely even reaches 50C under load. (OCCT), it just shuts down after random time, or drops an error message.
I have to remove power cable, wait some seconds, plug it back in, and then it turns back on.. Otherwise it wont even start after such a shutdown.
LLC is on Extreme.
My PSU didnt have a problem running an i7@4137 with 2x6970 in Crossfire, i dont think its the problem now.

What CPU Cooler are you using? Is it the Hyper TX3 EVO listed in your build?

I'd recommend you start with:
CPU 4.4Ghz
CPU - 1.35v
LLC Ultra High
Edited by ComputerRestore - 12/28/12 at 1:43pm
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