Noel

GTX Titan Xp v 1080Ti: besides the massive cost diff and 1GB more VRAM, what's the difference for P3D V4?

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I'm one to shoot for best parts for new builds, but since my 4.2y/o box is really up to the task for the time being (likely won't go V4 until all my add ons will work) except the video card I'm looking at these two options.  I'm not seeing a compelling reason to go w/ Titan Xp, but I really don't know.  1080Ti is massively stronger than my GTX Titan, so I plan to sell it and go w/ 1080Ti or God forbid, Titan Xp.  As I say, the cost difference is really substantial, yet published specs seem almost insignificant.  Please correct me if that's not the case.

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I am not even sure people can offer a good opinion on this yet given how new v4 is.  I think 12 months from now people will be suggesting 12 gig of VRAM (if available).

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The latest Titan X Pascal has the same architecture as the 1080 Ti.

Save yourself the extra cost and buy a 1080 Ti.

I have one and it drives 3 HD outside view monitors .

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3 minutes ago, GSalden said:

Save yourself the extra cost and buy a 1080 Ti.

Agreed. This is a no-brainer.  The Titan Xp shouldn't even be in the discussion because of the price/performance ratio.

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I'm currently running Haswell/4.4/TitanBlack w/6GB/EVO Pro SSDs

I run photoscenery only with AI at my major hubs.

I have TEXTURE_EXP=10 in the config. with ~4.3VRAM used and an 88% GPU load @69c temp.

Silky smooth at 30fps solid.

A 1080 whatever wouldn't help me at all. :biggrin:

 

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24 minutes ago, Greggy_D said:

Agreed. This is a no-brainer.  The Titan Xp shouldn't even be in the discussion because of the price/performance ratio.

If you want/need card with best perfromance TitanXp is no brainer and must to have, gtx1080ti is much cheaper but it is little bit slower.

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25 minutes ago, Jiri Kocman said:

If you want/need card with best perfromance TitanXp is no brainer and must to have, gtx1080ti is much cheaper but it is little bit slower.

The 1080 Ti is not slower.

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11 minutes ago, GSalden said:

The 1080 Ti is not slower.

It is of course. 1080Ti have less CUDA cores. 3584 CUDA on 1080Ti, 3840 on TitanXp.

This is shot from article - http://pctuning.tyden.cz/hardware/graficke-karty/46719-nvidia-titan-xp-ve-23-hrach-a-testech-vcetne-oc-na-vode?start=9

Results are avg. performance from over 20 games test. First three rows in graph are with water cooling. TitanXp in second row is not OC, it boost that high with water cooling. In default TitanXp is mostly same as OC edition of 1080Ti.

vykon.png

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And the OP's original question centers on a P3D4 use case.  Are you going to see a difference between a 1080 ti and Titan Xp in P3D4?  No way.

Waste another $400-$500 for bragging rights if you want.

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I agree that a Titan Xp is not a good value buy for P3D.  There are only 2 reasons to buy:

1) if you must have the absolute best performance possible, even if that extra performance costs another $500 and is only 7% faster than the $700 card (1080 Ti) which uses the same GPU (GP102).  

2) the extra 1GB VRAM *might* help when pushing the sim to the absolute limit

Rob Ainscough has stated a number of times now he's seen VRAM usage peak at 10.8GB on his 1080 Ti in P3D v4 with settings maxed and tons of add-ons.  That's awfully close to the 11GB limit of the card...  Food for thought.

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I remember someone somewhere saying P3Dv4 is pushing the limits of the current hardware. Which is of course right, if we start messing with TEXTURE_SIZE_EXP.

I question if these 11GB VRAM usage come from default P3Dv4 .cfg settings (sliders right, but nothing edited in the .cfg) or was for instance TEXTURE_SIZE_EXP been modded? Sounds very suspicious to me.

So all needs to be put into context. I can also say I want sharpest possible textures 100mi out @40,000ft, and need 100GB VRAM (figuratively speaking of course, no idea about the right number), but what's the point?

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1 minute ago, SimonC said:

I remember someone somewhere saying P3Dv4 is pushing the limits of the current hardware. Which is of course right, if we start messing with TEXTURE_SIZE_EXP.

I question if these 11GB VRAM usage come from default P3Dv4 .cfg settings (sliders right, but nothing edited in the .cfg) or was for instance TEXTURE_SIZE_EXP been modded? Sounds very suspicious to me.

So all needs to be put into context.

Yeah, it was Rob Ainscough, long-time P3D beta tester.  He provided details regarding the settings and add-ons which resulted in this VRAM usage.  What do you mean by "suspicious"?  

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Just now, TechguyMaxC said:

Yeah, it was Rob Ainscough, long-time P3D beta tester.  He provided details regarding the settings and add-ons which resulted in this VRAM usage.  What do you mean by "suspicious"?  

As in TSE was probably used...

Point me to the settings used please?

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Three posts on that page by Rob to paint the whole picture.  

 

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2 minutes ago, SimonC said:

As in TSE was probably used...

Point me to the settings used please?

And of course Texture Size Exponent was used, it's the basis for this entire discussion...  As in, none of us would even be talking about how much VRAM we have unless this feature was added, and utilized by us flight simmers.

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Ah I thought you meant some other test. I also mixed stuff up, sorry.

Well, says it all. You can push and push and push, and you'll never have enough. Even 12GB won't be enough. Catch my drift? :happy:

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11 minutes ago, SimonC said:

Ah I thought you meant some other test. I also mixed stuff up, sorry.

Well, says it all. You can push and push and push, and you'll never have enough. Even 12GB won't be enough. Catch my drift? :happy:

I don't think we have a test case yet that has exceeded 11GB, but I concede that it is certainly possible (and alluded to this in my first post re: the OP's question).  To be frank, I look forward to the day when I need a graphics card with more VRAM just to crank up the settings in flight sim.  

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3 hours ago, Noel said:

I'm one to shoot for best parts for new builds, but since my 4.2y/o box is really up to the task for the time being (likely won't go V4 until all my add ons will work) except the video card I'm looking at these two options.  I'm not seeing a compelling reason to go w/ Titan Xp, but I really don't know.  1080Ti is massively stronger than my GTX Titan, so I plan to sell it and go w/ 1080Ti or God forbid, Titan Xp.  As I say, the cost difference is really substantial, yet published specs seem almost insignificant.  Please correct me if that's not the case.

This is a question the Rob Ainscough would answer.

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14 minutes ago, TechguyMaxC said:

To be frank, I look forward to the day when I need a graphics card with more VRAM just to crank up the settings in flight sim.  

Personally, I am just happy that I can enjoy the flight without fear of running out of memory - but, to each his own.

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1 hour ago, TechguyMaxC said:

I agree that a Titan Xp is not a good value buy for P3D.  There are only 2 reasons to buy:

1) if you must have the absolute best performance possible, even if that extra performance costs another $500 and is only 7% faster than the $700 card (1080 Ti) which uses the same GPU (GP102).  

2) the extra 1GB VRAM *might* help when pushing the sim to the absolute limit

Rob Ainscough has stated a number of times now he's seen VRAM usage peak at 10.8GB on his 1080 Ti in P3D v4 with settings maxed and tons of add-ons.  That's awfully close to the 11GB limit of the card...  Food for thought.

Agree

Even Rob says that peak is 10.8GB, that can mean that there is no more video memory avaialble and it using unified memory (RAM will be used as VRAM), you can propably can see some extra load on buss interface as there is more transfers via PCI-E.

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OK thanks all that is good enough to make the decision.  1080Ti seems like the way to go for my needs.  How about water cooling--looks like 10% increase in total performance w/ the water cooling and that seems substantial enough unless this entails a lot of cost and hassle.   I've only used stock cooling on my GPUs, and Noctua air cooler on my 3930K.  

While we're here I have a question about nVidia Inspector's overclocking utility.  I notice w/ my old GTX Titan I have to disable autofan control in the overclocking utility in order for the clock speed to ramp up.  It is behaving as if clock speed is temperature controlled.  Is there a way to set it up so that fan speed automatically ramps up?  Seems weird that autofan will chug along at a fair low clip, clock speed stays around 890 or so, and if I uncheck the autofan box and manually set to 70% of maximum fan speed then very quickly clock speed ramps up--and the problem is that it's always running at 70% even when it doesn't need to!  So I'm looking for the trick to get autofan to aim for whatever it takes to maintain the highest clock speed the GPU can run at, but then down regulate when GPU demand wanes.

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Water cooling will increase default boost on card, for my 1080 I go about 100MHz up. But with good system cooling and good non reference cooling - ASUS, MSI, EVGA... it will be good enough. Water cooling if fine for aestetics, performance and noise. But custom water loop (CPU and GPU) will cost you about same price as 1080Ti

 

 

And for auto fan control, you can set up it manually or own curve for fan speed. Try EVGA utility which can do it at least for pascal chips. NV GPU clock depends on temperature and power limits. Even at default clocks, you propably hit power limit on pascal chips before you reach temp limit. Depends on bios, you can usually go to something like 120% power limit and 91°C temp.

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1 hour ago, SimonC said:

Personally, I am just happy that I can enjoy the flight without fear of running out of memory - but, to each his own.

Of course I'm happy with that as well.  What I meant by my earlier comment is that now we have a sim to match up to the hardware, and we can keep pushing settings to make the sim look even better as the newer, better hardware is released.  With the 32-bit sims, this wasn't possible.  

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