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[OFFICIAL] FX-8320/FX-8350 Vishera Owners Club - Page 471

post #4701 of 67262
Quote:
Originally Posted by Lordred View Post

Quote:
Originally Posted by FurtadoZ9 View Post

Would anyone happen to know if a 850 watt PSU is sufficient for 2x 6950's slightly overclocked and a 8350 pushed to 5ghz?

You would be cutting it a little tight @ 5ghz full load with GPU's at full load.


Good thing for you very very few games can load 8 threads fully.


Well at 5.0GHz the CPU is around 400w and the slightly OC 2 x 6950's are about 225w +/- a piece = 850w if everything is at full load and then whatever else you have. Full load on everything won't happen unless you intentionally load it, but I prefer a bit more buffer. I would get a 1000w especially if you are a bench-marker or for expansion.
my 2 cents. smile.gif
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post #4702 of 67262
Anyone on Win 7 who has not looked up or downloading the bulldozer hotfix, I keep it backed up on my domain.

PM me if you are unable to find it, but last I checked, Techpowerup keeps it ready for download, and MS provides it to you upon request. (how I got it)



Edit:
KB2646060
KB2645594
Edited by Lordred - 12/1/12 at 9:04am
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post #4703 of 67262
How can i cool those mosfets and vrm, some people says its temperature cause throttling on my oc
post #4704 of 67262
Quote:
Originally Posted by giooliva View Post

How can i cool those mosfets and vrm, some people says its temperature cause throttling on my oc

http://www.newegg.com/Product/Product.aspx?Item=N82E16835708011

That would help out a bit, + a fan pointed at em.



You already have a mosfet heat sink, point a fan at it.
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post #4705 of 67262
Quote:
Originally Posted by Red1776 View Post

Well at 5.0GHz the CPU is around 400w and the slightly OC 2 x 6950's are about 225w +/- a piece = 850w if everything is at full load and then whatever else you have. Full load on everything won't happen unless you intentionally load it, but I prefer a bit more buffer. I would get a 1000w especially if you are a bench-marker or for expansion.
my 2 cents. smile.gif

I was possibly thinking that was the reason why I couldn't hit 5ghz stable in a stress test, but then again the GPU's aren't at full load like you guys said. Hmm.. Thanks
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post #4706 of 67262
Haven't read this thread for a little. Are the 8350's doing better than 8320's or am I going to get same out of a oc'd 8320? Starting a new christmas build and want to support my new gtx590 right!
    
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post #4707 of 67262
For anyone having throttling issues like me..Here is 2 threads...

http://www.overclock.net/t/1202751/amd-fx-cpu-throttling-fixes-please-sticky and another forum http://www.overclockers.com/forums/showthread.php?t=698165&page=3

Im 90% sure my throttling is being caused by the power state..even though apm is disabled it is not actually disaabling it..Its not temp or voltage and I have tried every single option in the bios.....I also reformatted...There is a bunch of things to try for fixes but I have not gotten any to work for me.....also the max I can get stable is 4300....even though 4400mhz is stable during testing I turn my computer on in the morning and it randomly wont boot and the ONLY way to get it to boot is a load optimized default.....not a power supply issue either...I took many reading with occt




any thoughts?.....
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post #4708 of 67262
Thread Starter 
Quote:
Originally Posted by snelan View Post

Is it normal for my 8320 to require massive voltage increases past about 4.55GHz? I know my 2600k did this at a huge level, so I assume it is completely normal.

Also, I assume the maximum safe voltage if keeping the temps in check is 1.55v? In your guys' personal oppinion, do you feel like this is actually 24/7 safe, or would you want to only run that voltage for benching?

EDIT: @ Sazz - it says 4 Cores 8 Threads? Just curious because when I ran my 8320 in CB it noted all 8 Cores and 8 Threads. Did you turn off some cores for overclocking?

It's pretty normal, ya. The pattern is evident enough in the OP list.

I and others run at 1.536v 24/7, but PD is too new to say if that is degrading anything.
Quote:
Originally Posted by Red1776 View Post

Quote:
Originally Posted by Lordred View Post

Quote:
Originally Posted by FurtadoZ9 View Post

Would anyone happen to know if a 850 watt PSU is sufficient for 2x 6950's slightly overclocked and a 8350 pushed to 5ghz?

You would be cutting it a little tight @ 5ghz full load with GPU's at full load.


Good thing for you very very few games can load 8 threads fully.


Well at 5.0GHz the CPU is around 400w and the slightly OC 2 x 6950's are about 225w +/- a piece = 850w if everything is at full load and then whatever else you have. Full load on everything won't happen unless you intentionally load it, but I prefer a bit more buffer. I would get a 1000w especially if you are a bench-marker or for expansion.
my 2 cents. smile.gif

The CPU alone is not around 400w. At 4.8Ghz, anand has the whole system wattage under CPU only load at 350w. I'm not buying that 200mhz more equates to over 75w.

You're looking at maybe 300w. max.
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post #4709 of 67262
Quote:
Originally Posted by m0bius View Post

I have no idea on the validity to these statements, I just did a quick search of this thread and grabbed two that happened to be on first page I looked at. Meant to include it in my last post.

Thank you.

In the first report you quoted, the user is running stock clock but overvolting. That is not the exactly stock settings. So I think that report is still suspect. Also it is with an 8120 and not Vishera.

I forgot to mention I just upgraded from an 8120 to 8350 myself, and Prime95 27.7 was running fine on my 8120 before. But I was only OC'ing my 8120 to 3.6, I did not try higher because I was running in a smaller case also.

The second report is certainly disturbing, and that user should report the problem to mersenneforum.org . I will drop him a PM.

Edit: oh, and my Prime95 run is 18 hour stable so far on my FX-8350 at stock settings on my GA-990FXA-UD3 rev 1.1 and F9 BIOS. I'm almost ready to call it a day. I'm supposed to receive some 32GB DDR3-1866 from newegg, if it comes today that will definitely be good reason to stop that run. memtest86 might be in order though before I do anything else.
Edited by madbrain - 12/1/12 at 11:28am
post #4710 of 67262
Quote:
Originally Posted by cssorkinman View Post

I have also seen that some MSI users have been having trouble running stability programs at stock voltages/speeds. Here is my experience: stock vid is 1.28 @ 4ghz , it needs to maintain both of those values to be stable enough to pass prime 95. IF turbo tries to kick in or there is enough vdroop for it to drop below 1.28 volts, it will not pass prime. In my case at that clock and voltage it will droop .03 volts.

I am one of those unfortunate users (MSI 990XA-GD55 + FX-8350) with stability problems.
At stock settings, the system is unstable when running Prime95. Most of the time, it just fails rounding, but once in a while it spontaneously resets or BSODs.
I have never seen the voltage drop below 1.296 (I think that was the value), and I tried increasing the voltage significantly to compensate for any droops ... that removed the resets/BSODs, but the calculation errors persisted.

The errors were *consistently* on the core 7/8 pair, so there's a reasonable chance the CPU is faulty ... so I RMA'd it yesterday :-(
I guess the power-distribution on the CPU could also just have the worst droop in that corner of the die ... I guess I'll see when I get a replacement.
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