Overclocking performance

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FSXDEV
Posts: 4
Joined: Sat May 04, 2019 4:23 am

Overclocking performance

Postby FSXDEV » Sat May 04, 2019 4:37 am

Hi guys,

I’m lookin into VR flight sim for the first time since I stopped playing fsx 9 years ago. How much of a difference will Overclocking an i9900 make compared to stock? Would getting to 5.5 ghz be much of a difference over 5ghz?

Thanks

Pete Dowson
Posts: 572
Joined: Sat Dec 18, 2010 3:45 pm

Re: Overclocking performance

Postby Pete Dowson » Sat May 04, 2019 10:09 am

I’m lookin into VR flight sim for the first time since I stopped playing fsx 9 years ago. How much of a difference will Overclocking an i9900 make compared to stock? Would getting to 5.5 ghz be much of a difference over 5ghz?
I don't know about VR. My system involved 3 projectors with three P3D scenery windows. My new PC is a 9900K clocked at 5.5Ghz, with the cache clocked at 5.0GHz and 3600 MHz RAM. and the difference from my previous system, a 7900X clocked to 4.8GHz with 2800 MHz RAM is dramatic.

My test scenario involves Aerosoft or UK2000 EGLL with AI traffic, and on my previous setup I was getting 18-24 fps and microstutters even with AI traffic limited to 80. On the new system I get 24-30 fps, averaging 26 or more, and smoother, even with 200 AI aircraft.

Mind you, we also changed from 2 x 1080Ti's in SLI to 2 x 2080Ti's with nVlink SLI. They probably help too.

I don't know which higher speed component is mostly responsible, probably a combination. There's always going to be a bottleneck somewhere and just overclocking the processor without looking at everything else might not gain you the improvement you'd expect. 5.0 to .5 isn't necessarily at 10% improvement in performance.

Pete
My System

Win10: 1803 build 17134
Processor: I9 9900K at 5.5GHz
Mobo: Maximus XI Formula Z390
Memory: 32Gb at 3600 MHz.
GPUs: 2 x 2080Ti SLI
Displays: 3 x 1080p projectors at 30Hz onto 210 FOV curved screen
P3D4 set with 3 windows in nVidia surround mode

FSXDEV
Posts: 4
Joined: Sat May 04, 2019 4:23 am

Re: Overclocking performance

Postby FSXDEV » Sat May 04, 2019 6:28 pm

Thanks for the info. Have you tried your setup with 1 video card vs 2? Would a better card such as titan rtx, or quadro 8000/6000 improve your system?

Pete Dowson
Posts: 572
Joined: Sat Dec 18, 2010 3:45 pm

Re: Overclocking performance

Postby Pete Dowson » Sat May 04, 2019 10:29 pm

Thanks for the info. Have you tried your setup with 1 video card vs 2? Would a better card such as titan rtx, or quadro 8000/6000 improve your system?
The performance was the same with one card, but the two were a little better with smoothness.

Actually I currently thinking of changing to a cooled and overclocked RTX Titan, as its VRAM is 24Gb, more than the 2 x 11Gb on the two 2080Ti's, and of course, even though the nVlink SLI strap is fast, it's still another data path slowing things down.

Pete
My System

Win10: 1803 build 17134
Processor: I9 9900K at 5.5GHz
Mobo: Maximus XI Formula Z390
Memory: 32Gb at 3600 MHz.
GPUs: 2 x 2080Ti SLI
Displays: 3 x 1080p projectors at 30Hz onto 210 FOV curved screen
P3D4 set with 3 windows in nVidia surround mode

francescodoenz
Posts: 251
Joined: Thu Oct 25, 2012 6:13 pm
Location: Morges,Switzerland,

Re: Overclocking performance

Postby francescodoenz » Wed May 08, 2019 11:50 am

9900k at 5.5GHz is amazing! What Vcore and cooling are you using??
MSI MEG Z390 Godlike, 9700K, 2xRTX2080TI NVlink, 16GB G.Skill DDR4-4600, 2xAlphacool Eiswand, Coolermaster HAF-X

AnkH
Posts: 217
Joined: Tue Sep 23, 2014 1:20 pm

Re: Overclocking performance

Postby AnkH » Wed May 08, 2019 3:22 pm

Do the maths, pretty simple. Clocking from 5.0 to 5.5GHz results in 10% more clock speed and in the unrealistic situation of 10% performance increase, you will get 10% more FPS. Means: if you get now 20FPS, you will afterwards get 22FPS. Worth the hassle? I would say no, it will certainly not make the difference between playable or non-usable simulator and it will certainly not allow VR if stock is not enough.

Don't be fooled by the example of Pete, he sees the nice performance increase not only due to the increased clock rates. He has changed more:

- a solid + 15% increase in clock rates
- change to GPUs that provide 30-50% more power.
- a solid 28% increase in RAM bandwith

Regarding this system change, his increase in FPS of about 25-30% looks dramatic, but it is pretty much in line of the improved hardware he uses now.
------------------
Chris

Hardware: i7 8700K@5.0GHz, 2x16GB DDR4 3200MHz CL14 RAM, Gigabyte Aorus GTX-1080Ti OC, Samsung SSDs (250GB for OS, 2TB for P3D), Windows 10 Home

Pete Dowson
Posts: 572
Joined: Sat Dec 18, 2010 3:45 pm

Re: Overclocking performance

Postby Pete Dowson » Wed May 08, 2019 4:03 pm

9900k at 5.5GHz is amazing! What Vcore and cooling are you using??

I don't recall the vCore off-hand. Not as high as you'd expect. The cooler is the important part -- an external Koolance cooier which is probably itself about a third the size of the full case of the main PC. It has to be switched on 10-20 minutes before the PC else it that often BSOD on booting into Windows, if not soon after.

But as Chris said, it isn't only the CPU. The cache at 5.0 has a lot to do with it, as does the faster RAM. And I've tried to optimise the spread of the 8 core usages across the add-on processes I have to run to support my cockpit system.

Even so, Core 0 is still hitting 100% most of the time -- but that's probably because i run with about 3 times the number of AI as before -- over 200 and up to 300 in busy areas, up from my previous limit of 80.

I plan to limit it again, to 200 or even only 150 so I can ramp up some other things. i'd really like to use Orbs True earth series, but no way that will work well even with this beast.

It's having the three scenery views for ny 210 FOV screen which is the real killer, and the reason for having this monster built! ;-)

Pete
My System

Win10: 1803 build 17134
Processor: I9 9900K at 5.5GHz
Mobo: Maximus XI Formula Z390
Memory: 32Gb at 3600 MHz.
GPUs: 2 x 2080Ti SLI
Displays: 3 x 1080p projectors at 30Hz onto 210 FOV curved screen
P3D4 set with 3 windows in nVidia surround mode


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