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Thinking about retiring my PhenomII 955 for an FX-6350 - Page 3

post #21 of 53
You could just skip over the six cores and get their big brother? The 8120 BULLDOZER!!! Just a thought.
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post #22 of 53
LOL...that cpu is not for games.
is worst than amd x4
post #23 of 53
Thread Starter 
It's not worse if I'm getting more FPS than my old Phenom II smile.gif

Physics on stock PII was 4258 and is 5706 on stock FX6350.

I'm going to mess around with the OC again soon and see if I can break 6k.
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post #24 of 53
Quote:
Originally Posted by FastMHz View Post

It's not worse if I'm getting more FPS than my old Phenom II smile.gif

Physics on stock PII was 4258 and is 5706 on stock FX6350.

I'm going to mess around with the OC again soon and see if I can break 6k.

Try breaking 7K. That's what I'm trying for smile.gif
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post #25 of 53
Thread Starter 
With FX6350 @ 4.4GHz I easily broke 6k @ 6259. I'll need a bigger heatsink before I can try higher as I tickle 60c with the current OC.

EDIT: Backed off to 4.2GHz, IntelBurnTest said it was unstable at 4.4. I upped the voltage from 1.425 to 1.45 and still got an unstable result, and didn't want to go higher without better cooling. Turns out 4.2GHz @ 1.425v is the stock "turbo core" speed and voltage for this chip, so I'll stick with that for now.
Edited by FastMHz - 1/12/14 at 9:39am
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post #26 of 53
I found when overclocking on a PD chip (technically a richland) that my mistake was using TOO MUCH voltage, which led to higher temps and instability. Reeling back on the voltage actually led to higher stable overclocks. Taking the time to find out what sort of voltage tolerances you have for stability on the chip may be beneficial.

Turn off all turbo features and check the VID of the chip (turning off turbo core will remove the Pstate override and allow you to see the base clock VID, which IMO is useful as a starting point). VID of my richland w/base 4.1ghz was 1.275V IIRC. Some FX based PD chips have quite low VIDs as well so this is worth looking into. I then performed under-volting tests to get a feel for things. I chose 4.0ghz to run these tests at because it is a nice round number. @4.0ghz it can run down below 1.200V. (I stopped testing at 1.188V, figuring I must be close to the limits [edit in: after further testing, I have confirmed that this was indeed very close to the lower limit, testing below ~1.18V has revealed stability and boot failures]. From that "baseline" I followed the general "rule of Pstate thumb" up to 4.6ghz, adding 0.025V per 100mhz increment. Lo and behold, ~1.35V is plenty for 4.6ghz on that chip. 1.40V would be where I would try for 4.8ghz on this chip, or 1.45V for 5.0ghz. I haven't had the chance to test and push for those levels. I'd say that if you want to maintain a reasonably efficient performance, that wherever the voltage demands begin rising MORE than 0.025V per 100mhz to maintain stability, is a good point to stop for a practical everyday overclock, as beyond that is limited opportunity and a lot more heat. YMMV.
Edited by mdocod - 1/12/14 at 10:31am
     
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post #27 of 53
Thread Starter 
Very interesting info there. I'll definitely have to try lowering the voltage to see what happens!
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post #28 of 53
Quote:
Originally Posted by FastMHz View Post

It's not worse if I'm getting more FPS than my old Phenom II smile.gif

Physics on stock PII was 4258 and is 5706 on stock FX6350.

I'm going to mess around with the OC again soon and see if I can break 6k.

I was talking about amd fx 8120 smile.gif
fx 6300 with oc is very good
Edited by fabiovtec - 1/12/14 at 11:57am
post #29 of 53
Quote:
Originally Posted by mdocod View Post

I found when overclocking on a PD chip (technically a richland) that my mistake was using TOO MUCH voltage, which led to higher temps and instability. Reeling back on the voltage actually led to higher stable overclocks. Taking the time to find out what sort of voltage tolerances you have for stability on the chip may be beneficial.

Turn off all turbo features and check the VID of the chip (turning off turbo core will remove the Pstate override and allow you to see the base clock VID, which IMO is useful as a starting point). VID of my richland w/base 4.1ghz was 1.275V IIRC. Some FX based PD chips have quite low VIDs as well so this is worth looking into. I then performed under-volting tests to get a feel for things. I chose 4.0ghz to run these tests at because it is a nice round number. @4.0ghz it can run down below 1.200V. (I stopped testing at 1.188V, figuring I must be close to the limits [edit in: after further testing, I have confirmed that this was indeed very close to the lower limit, testing below ~1.18V has revealed stability and boot failures]. From that "baseline" I followed the general "rule of Pstate thumb" up to 4.6ghz, adding 0.025V per 100mhz increment. Lo and behold, ~1.35V is plenty for 4.6ghz on that chip. 1.40V would be where I would try for 4.8ghz on this chip, or 1.45V for 5.0ghz. I haven't had the chance to test and push for those levels. I'd say that if you want to maintain a reasonably efficient performance, that wherever the voltage demands begin rising MORE than 0.025V per 100mhz to maintain stability, is a good point to stop for a practical everyday overclock, as beyond that is limited opportunity and a lot more heat. YMMV.

This was helpful. Right now I;m at 4Ghz at 1.2v running p95. Never though it could run with so less voltage so I never tried. Thanks though thumb.gif
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post #30 of 53
I decided to push that theory.... sure enough. ~1.45V is perfect on that chip for 5ghz stability. Unfortunately I don't have enough cooling to maintain it. Not sure if it's VRMs or the chip itself but it has blips of throttling when stress tested on all 4 cores @5ghz, but maintained short term stability [i did not test it long term but experienced no crashes on a short term stress test). Interestingly enough, the 0.025V per 100mhz rule seems to hold very close to true all the way from 4 to 5ghz for me. So keep that in mind. Different ranges are also preferential to different LLC profiles to maintain stable voltage.

Unfortunately, I would need a lot more cooling power to run those speeds as a daily driver, since we also like to leverage the iGPU heavily, and it proved to have thermal problems under just a CPU side load, but the fact that the stability vs voltage characteristics seem to hold on such a steady predictable scale is very nifty IMO.
     
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