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FX Piledriver overclocking questions

post #1 of 17
Thread Starter 
I have not overclocked an AMD since my FX-55, so I need some tips / hints /pointers. I currently have an FX-6300.


Le questions:
  • What is the maximum voltage that I could use assuming 24/7 operation? (I will not use it 24/7 but want the stability)
  • What is the maximum 24/7 temperature that I can run the CPU at?
  • How can I monitor VRM temperature on an ASUS M5A97 R2.0? What program should I use to monitor?
  • Increasing bus vs multi overclocking - Which? (I'm testing it in prime95 right now @ 250)
  • As bus speed increases, does anything else need to be decreased?



Right now I have prime95 running, I am testing at 250x16@1.464v under load. I haven't done anything other than play with fan profiles and the CPU speed, so everything else is on auto. My Memory tab in CPU-Z currently reads:

DRAM Freq: 830MHz
FSB:DRAM: 3:10
timings:9-11-9-27-33
Edited by Mr.N00bLaR - 11/16/12 at 5:04pm
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post #2 of 17
PD is PD, ask away: http://www.overclock.net/t/1318995/official-fx-8320-fx-8350-vishera-owners-club

Basics:

62C Core temp max. Not CPU, Core.

Bus vs multi: Whatever gets the job done, the difference is minimal.

FSB clocking: Yes. Lock PCI-e clock at 100 (not auto), HT, NB, and RAM are all also effected by FSB. As a result, you need to compensate.

I run CPU voltage at 1.536. Others do the same. Nothing has died yet. I don't expect an A70 to get that far before you hit a temp wall anyway.

HWMonitor and HWiNFO should be able to give you all the temps you need. I do not know what corresponds to what on ASUS boards.

More VDDA/PLL voltage means lower Vcore voltages. 2.695v VDDA (from 2.5) has been shown to reduce needed CPU volts by around .05, regardless of OC method.

Keeping NB and HT near stock is good. They can be OC'd, but there is little gain and more heat/instability.

Use multiple stress programs. P95 has proven to be picky with BD/PD and has failed for no reason (on CPUs at stock) for people. Other options include Intel Burn Test (runs hotter then Prime, good for finding your true max temps), and AMD Overdrive's tester.
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post #3 of 17
The main obstacle in overclocking the FX chips is that they tend to get really hot. What cooling do you have?
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post #4 of 17
Thread Starter 
Right now I have the stock fans on what ASUS considers "Standard" fan profile which is very quiet vs "turbo". I have moved to 250x17.5 for 4380MHz. Been running p95 for about 1 hour now and now issues. Forgot about locking down the PCIE.. I may go back to stock bus speed and see where I get.

The heatsinks on the VRMs seem decent, so I'm not to worried.

Does overclocking the bus change the RAM speed? There's a lot of things to change on this platform vs my old 775 haha. So far with fans on the standard profile and 1hr of mixed p95 my core temp is 52C (CPU is 61C). It looks like the A70 isn't doing to bad, my ambient is generally adjusted 70F. You are almost an entire 10th of a volt above me... It looks like the A70 won't get me to the chip max most likely but that's okay. If I need to I may grab an H80.
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post #5 of 17
Quote:
Originally Posted by Mr.N00bLaR View Post

Right now I have the stock fans on what ASUS considers "Standard" fan profile which is very quiet vs "turbo". I have moved to 250x17.5 for 4380MHz. Been running p95 for about 1 hour now and now issues. Forgot about locking down the PCIE.. I may go back to stock bus speed and see where I get.

The heatsinks on the VRMs seem decent, so I'm not to worried.

Does overclocking the bus change the RAM speed? There's a lot of things to change on this platform vs my old 775 haha. So far with fans on the standard profile and 1hr of mixed p95 my core temp is 52C (CPU is 61C). It looks like the A70 isn't doing to bad, my ambient is generally adjusted 70F. You are almost an entire 10th of a volt above me... It looks like the A70 won't get me to the chip max most likely but that's okay. If I need to I may grab an H80.

You're also on a 6-core, I very much hope it does better temp wise them my 8320. I can see you reaching 4.5-4.6 on the A70 since you aren't as held back by heat as the 83**s

FSB changes:

HyperTransport (stock is 2600)
NorthBridge (stock is 2200)
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post #6 of 17
Thread Starter 
Where I'm at right now:

Quiet fan speed overclock profile:
200x22@1.488.
My NB and HT seem to be running much slower on the auto setting than what you posted..NB and HT seem to be running at 2000MHz right now. I'm going to stop my testing right now and see if the PC will run at those clocks you quoted.


EDIT: Are you sure those are normal stock speeds? I cant get my BIOS to go past 2400MHz HT.
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post #7 of 17
Stock HT speed on the FX chips are 2200 is what my mobo set it at.
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post #8 of 17
My stock NB is 2.2, HT is 2.6.

CPUWorld will back me up on the HT clock for dixson here: http://www.cpu-world.com/CPUs/Bulldozer/AMD-FX-Series%20FX-8320.html
And the same for Mr.N00bLaR: http://www.cpu-world.com/CPUs/Bulldozer/AMD-FX-Series%20FX-6300.html
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post #9 of 17
It's best to icrease the multi and overclock but then again a mix and matching of fsb and multi should do well.
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post #10 of 17
Thread Starter 
I was stress testing but then my pc restarted.... I'm pretty sure my hard drive is toast since it isn't recognized anymore. Oh well, it was a 7 year old WD caviar that's been heavily used. Got an old laptop drive. Who knows how much of some of those errors were due to the drive..lol. It still doesnt explain the missing options in my BIOS for the HT speed.. I guess I'll have to read up on that.


EDIT: Switched sata port, able and power cable and the drive boots now... hmm.
Edited by Mr.N00bLaR - 11/17/12 at 10:47pm
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