@Dave

   I would more likely say the relationship ratio is straight after/before Ghz - 4.8/3.7 = 1.3 and at about 6m30s, 24/18 = 1.33 - this is what we would expect for CPU bound FPS. There may be other benefits (e.g. "smoothness" or <VAS) as well.

 

Dave W.

Well unfortunatley if I stick my PC outside ... even in the shade ... it's 91F ... inside the house I keep it at 71-72 F (thank you solar panels).

 

But this might be a safer option than sticking it outside: http://koolance.com/exc-800-portable-800W-recirculating-chiller

 

 

This is part of my new Xmas build PC I'm working on.  It'll be cooling CPU, motherboard, RAM, and 3 Titan Blacks.  Goal is 5Ghz on a 5960X with 16GB DDR4 3200 quad (CL 15).

 

GPU OC will work well for P3D but you really need a good water cooling unit like this: http://koolance.com/video-card-vga-nvidia-geforce-gtx-titan-water-block-vid-nxttn2

 

RAM cooler: http://koolance.com/ram-33-memory-water-block

 

 

You should be able to hit a reliable 5Ghz and considerable OC with the 780 using this setup.  You may need to max voltages but you shouldn't need to go beyond "Safe" voltages.  So over stock clocks you should see on average (not peak) about a 60% gain in performance.

 

Although OC done wrong can be the source of all kinds of issues with applications, OS, and flight sims ... if done right OC can be a big win ... doing it right is the tricky part.

 

Best of luck and encourage you to forge ahead ... just make sure you leave thermal protection enabled ... this should save components.

 

Cheers, Rob.

 

 

Hi Rob

 

I think i have the gold chip of the I7-4770K because i can boot up in W7 with 4,9GHZ using 1,21v but not stable.

 

For now i am at 1.245V stable at 4,7GHZ but the temp do hit around 75-80c on 4 cores in FSX/P3D.

 

Going higher with voltages alone does not seem to stabilize 4,8-4,9GHZ.

 

Ram is running at 1333MHZ,1,65V. It is Corsair DDR3 1600MHZ CL7+CL8 ram (2x2x2x2gb). 

 

Do you think its possible to hit 4,8 or 4,9 stable with this relativ low voltages i am using right now ?

 

Thanks

 

Michael

For now i am at 1.245V stable at 4,7GHZ but the temp do hit around 75-80c on 4 cores in FSX/P3D.

4.7 is very respectable. Those temps although not dangerous are I think a bit high for 1.24v. You should be looking for about 70c under load.

You might want to invest in a good aftermarket cooler.

 

NickN's Overclcocking Haswell guide on simforums.com has the answers to all of the questions your asking.

 

You have to OC gradually and test every step of the way so its a very time consuming endevour.

 

You can go a lot higher than 1.24v but if you are getting 75-80c at that voltage under load I think there is something wrong with your cooling.

I get less than 60c under load at 4.8ghz with 1.4v

Reading this thread is kinda like driving my old VW to work and seeing a Maserati on the side of the road, hood up, and two guys working on the engine.

Yeah, driving a Maserati would be cool, but my old VW does just fine for something as mundane as driving to work. And I'd be more willing to tinker with my VW. But you go right ahead.

 

:lol:

Any chance of running a straight HT on/off comparison?

I just did that and was suprised to find that there was no OOM warning at all and at the end of the playback I loaded the scenario and no OOM (ussually loading the scenario after after the Playback gets an immediate OOM)

 

Also there is an FPS differance. Looks like FPS is better in Very heavy areas with HT on but is better in with HT off otherwise.

 

 

I

I've read that you could overclock just one or a few of the cores and leave the others at lower Ghz in order to keep the temps lower and therefore OC the one core (the main P3D core) a lot more and maintain stability.

I might try that at some point but I am sure that it will involve advanced settings like Having a different voltage on different cores. Probably above my pay grade

 

 

 

Not sure if you can try to measure smoothness

Nope won't be measuring long frames. But once I get as much out of the system as I can I will make a smoothness eyeball comparison between the default clock setting and the maximum OC setting I can get.

 

Seems strange that OOM is affected by better performance.

 

Seems even stranger that Hyper threading has an effect on OOMs. I will try to do a more revealing comparison on this.

 

 

I might try that at some point but I am sure that it will involve advanced settings like Having a different voltage on different cores. Probably above my pay grade

 

There are actually programs such as Intel Extreme Tuning Utility and MSI Control Center that will let you overclock individual cores without even going into the bios.  I have played around a little with those programs and was actually surprised at the ease of use and control. You should give something like that a try. 

 

Thanks for sharing this information, I find it very interesting and informative.

 

Ryan

I have come to the conclusion that as far as FPS is concerned on my system HT off is the way to go.
Although the earlier test indicated that the HT on seemed better in heavy scenery like Cities and International airports and HT off seemed better over residential and forests, my latest test at 4.8Ghz and 4.5Ghz CPU Cache shows that HT off is better across the board. AND the onset of OOM was delayed and in fact eliminated in this test with HT off:

 
I double checked this and got the same results both times.

It appears from this next test that P3D V2.4 as is FSX highly dependent on the CPU, despite all the talk of much of the work being moved to the GPU. The Start of the graph looks very promising with the aircraft over the new P3D water but as soon as it gets over the more conventional FSX type scenery the FPS start to almost perfectly match in both graphs. The change is that the GPU and Graphics memory are Oce'd by 205Mhz and 500Mhz respectively. Very respectable OC for a GTX 780:

 

 

That's it for now until I see sub zero temps.

 

Next on the agenda is 5ghz and Dram timing reduced from CL9 to CL8

If I can do this successfully I will try the Asus Windows based utility for CPU overclocking and see if I can just overclock core 0 i.e . the core that is always at 100% synchronizing the threads while the rest are at around 30 to 50% most of the time. That should be an interesting comparison.

 

On average this Overclocking has produced a 33% performance increase.

I have come to the conclusion that as far as FPS is concerned on my system HT off is the way to go

Hi, Thanks Dave, I have been enjoying your discussion. What AM did you use with HT=ON?

 

 

What AM did you use with HT=ON?

 

I didn't set any affinity mask. I just let P3D handle that. Whatever the default is?

Do you have any suggestion?

Well with HT=ON you have to be careful so that the main thread you mentioned does not share the core. So with that type of app with HT=ON, at a minimum an AM should be chosen to disable alternate logical processors.

So with that type of app with HT=ON, at a minimum an AM should be chosen to disable alternate logical processors.

 

OK, I think I know what you mean. I read that as meaning that the job of synchronizing all the threads is done on one core and not distributed across all the cores? I understood that so long as AffinityMask=X is not in the Prepar3D.cfg Prepar3D would detect the number of cores and manage the affinity mask itself.

 

Edit: No that's not what you mean. You mean that the alternate processors should be left free for other Apps?

An HT core presents itself as two logical processors. P3D has gone back to an AM=0, which means all LPs are available. Check how P3D loads up on an HT enabled CPU with Task Manager.

 

...you have to be careful so that the main thread you mentioned does not share the core

 

Another reason to use an AM with HT=ON, is to control heat. With the P3d or FSX type of app they will make several threads each trying to go full out if they can. If they share an HT enabled core they reduce each other's bandwidth, and produce more heat since they are bringing the HT on.

 

If you don't use HT=ON, sooner or later another thread will activate on one of the precious P3D cores, and at that point they become more inefficient with HT=OFF.

As far as HT ON/OFF and OOMs ... more cores = more threads doing work = more memory used and the more work the main thread will have to do to manage/sync the additional threads.

 

The other possibility is OC stability issues surfacing that are causing the OOMs.

 

As far as time between frames, what I've noticed is that a higher base clock (BCLK) and lower multiplier produces more consistent time between frames.  So I would recommend you start with the highest BCLK you can then work the multiplier (if you haven't already done this).  In my case a BCLK of 125 with 4.6Ghz final produced better overall system performance than BCLK of 100 with 4.8Gzh final.

 

Cheers, Rob.

Thanks for the input guys. I don't want to diverge from the path I am on. I am not expert and cannot invest much more time in going beyond where I am with this. I have already OCCT'ed my 4.8/4.5ghz profile and its stable. I don't think I will bother with Overclocking the GPU. It didn't bring any real benefit. I do like high frame rates and high setting! Settings that are likely to result in OOM's so with HT off it seems that I can avoid that and get higher FPS.

 

Time to start the winter sim season   A little bit early.

 

When winter really does arrive I'll post the graph for 5ghz and CL8 for comparison.

I'll post a video shortly showcasing the results of the efforts and that's about it