I'm not well versed with overclocking, I just normally follow the video guides and I try to change as very little as possible.

So far, on my Asus Maximus XI Hero I only changed the core clock to 48, best scenario, and the voltage. I started initially with 1.25v which gets me up to 80c when testing on IBT.

Today, I adjusted my voltage decreasing .05v after every test to see how low I can go without any issues. I run it everytime on IBT with very high option enabled for 5 passes. The lowest I got is 1.150v (HWmonitor max showing 1.146). Unbelievable. Now my temps even with PMDG 777, mid settings, etc. never exceeds 67c. I am not sure if this is okay, my main question to the more experienced is, is this normal, and do I risk any CPU damage by running an overclock to 4.8ghz at this low voltage?

 

Thank you.

 

Romano Lara

Edited January 28, 20197 yr by jmrtlara

57 minutes ago, jmrtlara said:

... my main question to the more experienced is, is this normal, and do I risk any CPU damage by running an overclock to 4.8ghz at this low voltage?

I might be wrong, but I believe the only way to damage a processor is with high temperatures, which are directly related to voltage (and cooling).  Maintaining a stable O/C with the lowest voltage (and temperature) possible is a win-win.  I am currently stable at 5.0GHz with 1.240 volts and temps averaging low to mid 60s in P3Dv4.4 with all the whistles and bells (see specs in sig below).

There are others with much more experience here... looking forward to more educated insights.

Do be cautious with IBT... it puts a lot of stress on the CPU/system.  Some say it's too much for modern CPU's.  You could use Real Bench and run multiple passes.  Cinebench is good too.  Perhaps the best benchmarking tool we have is the flightsim.  Modern sims (including FSX) are hard on CPU's! 

As Doug mentioned, running a high overclock at a low voltage... is a win-win!  You're doing fine... your voltage at 4.8 and temps are good.  If you haven't invested in after market cooling, you should (all simmers should ).

Press on and good luck!

Greg

I don't use IBT or any other test that loads the CPU up with AVX instructions, which are an unrealistic load for a sim machine.  I prefer Prime95, either an older pre-AVX version or the current one with the AVX instructions disabled in the config file.

You won't do physical damage to your CPU with a low-voltage overclock--but if the voltage isn't high enough to keep the system long-term stable, then you risk corrupting your data or having recurring and/or intermittent crashes.  The problem with running short tests is you don't get a good idea if you're running right at the ragged edge of instability.  A stress test of 4 hours is what I'd consider a minimum run for proof of long-term stability...8-12 hours or more, even better.  5 passes of IBT does not answer the mail from a long-term stability perspective.

Regards

 

6 hours ago, lownslo said:

Perhaps the best benchmarking tool we have is the flightsim.  Modern sims (including FSX) are hard on CPU's! 

Romano - This +1... I have tried most of the benchmark tools, but in the end, doing numerous long flights with advanced aircraft into-out of complex sceneries with AI and variable weather is the ultimate proof of the pudding.  If your sim is stable, you've succeeded in my book.

29 minutes ago, dmiannay said:

Romano - This +1... I have tried most of the benchmark tools, but in the end, doing numerous long flights with advanced aircraft into-out of complex sceneries with AI and variable weather is the ultimate proof of the pudding.  If your sim is stable, you've succeeded in my book.

I agree.  I’ve run overclocks through Prime95 for 24 hours successfully, only to blue screen  in my flight sim.  

Thanks everyone.

I did a quick hop last night from RCTP to RPLL using PacSim scenery and PMDG 777.

Then did a RealBench stress test for 15 minutes.

Now doing another online flight using the Aerosoft A320 from IAD (FlightBeam) to Boston (FlyTampa) to see how it holds up.

In the end I'm really quite happy with my voltage and OC to 4.8ghz, from running P3D with constant 65~75c temps to now maxing out at 65 peaks. I didn't know possible since all the online tutorials and reading references are always pointing to 1.25 *minimum* for any OC on 8700k at 4.8ghz. 😲

I am using the Silverstone Tundra SST-TD03 Lite AIO cooler 🙂

Edited January 29, 20197 yr by jmrtlara

4 hours ago, DylanC said:

I’ve run overclocks through Prime95 for 24 hours successfully, only to blue screen  in my flight sim.  

Yep!  The primary use of this PC is CAD/CAM... and I benchmark the system for that work using a flightsim.  Have for many years!

Greg

Would absolutely agree with you guys regarding the unnecessary practice of excessive stress tests, for 8, 10 or even 24 hours. Totally unnecessary.

In many years of building PC's and overlooking PC's, I've never stress tested for longer than 4 hours. Usually just one hour.

I would also absolutely agree that a rig can pass many hours of stress testing and then fail as soon as you fire up the sim, Handbrake, or whatever else you run on your system. In fact I have passed stress tests in the past, and then failed as soon as I run Battlefield.

We don't build Prime 95 PC's or Cinebench PC's, we build PC's to handle the applications we regularly run.