Thanks Ryan, hence the reason why I said wait until someone that knows what there talking about comes along. I just seem to remember a discussion on here some time ago and the VAS/VRAM stuff was mentioned, probably around the time the GTX590`s came out.

Thanks for clearing that up

 

Doogie

 

edit, I take it that's the reason when folks stick a big VRAM card in and think they can crank the settings way up they still OOM?  Pretty sure I hit the sweet spot with my 580, wondering how the 770 will do when I install it.

Not true actually - it only shadows what you're actually using, not the full 4GB or whatever. (if it did, a 4GB+ card couldn't even run FSX, it would OOM immediately - obviously not true as there's people running Titans with 6GB etc)

 

Thanks for clearing that up Ryan.

What's the latest, Howard?  Hopefully it was the issue related to the space on your hard drive that you mentioned earlier.  I have my eye on a 770/4G myself.

What's the latest, Howard?  Hopefully it was the issue related to the space on your hard drive that you mentioned earlier.  I have my eye on a 770/4G myself.

 

Hi Mike, I can confirm that yes, it was the lack of space on the C drive. Not quite sure what has gone on, because I always like to keep about 10Gb free on my 64gb SSD OS. Anyway, during the time when I was trying to get to the bottom of things I noticed the OS SSD had only about 260kb of free space!! No wonder I could hardly get anything to work! Anyway, that seems to have been the issue, as I did a test flight yesterday of 45 minutes in the NGX with full addons and had no recurrence of the problem.

 

As for the GPU, I have always been one of the many who believes an upgrade in the GPU department is futile in FSX, well this has proved me wrong and I hold my hand up and apologise publicly for the times I have been a naysayer. It simply isn't true. OK, I'm sure it is very system dependent and suspect I have seen a boost because I have a pretty fast CPU (4.6oc) and the GPU may well have been the bottleneck. I have seen an increase overall of about 5-10% but where I have seen a big improvement is in cloud and at large airports. I saved some flight scenarios with my 580 so I could do some comparisons. With heavy cloud cover in the piston Duke I went from 22fps to around 28/30fps. Around some of the heavier airports where I noticed stutters and low frames, again I saw similar increases. Then there were scenarios where I could see no difference, very odd. I guess it's the way some addons are designed. Anyway, I am a happy boy. I can't say everyone else will experience the same kind of improvements, but only that I have on my system.

 

Take from my experience what you will Mike, good luck.

I am glad to hear that things are working well for you and that it was simply a minor issue after all.  Amazing how many things can affect performance.  

@OP

Did you happen to load P3Dv2 recently? It will create a 10gb temporary chunk on the c: drive even if you install to another drive. It is located in Program Data/cache or something similar

@OP

Did you happen to load P3Dv2 recently? It will create a 10gb temporary chunk on the c: drive even if you install to another drive. It is located in Program Data/cache or something similar

Ah, thanks for the info, but no, I haven't installed P3D. In fact from all the things I've read and all the issues people are having just to get it working reasonably, I think I'm going to stick with FSX and try installing Steve's fixer again.

Hi guys:

 

I read through this as I too am having problems with a GTX770 that are killing me. New rig, I7 4770 with the video card. Had problems when it was Win 7 and tried everything, then just upgraded to Win8 and same problem. P3D in Win 7...same problem. P3D is not on the new build, just FSX.

 

This is a clean install of FSX acceleration...no addons, so nothing. Tried Nvidea inspector and some of the common tweaks, same problem before and after. Very simple:

Starting up get the fps I would expect, in the 50's. Have it fixed at 60. After almost a minute (and the same timing every time, so very repeatable), fps just drops to nothing. 20's, then some spikes at 8...teens...does this for about 30 secs, then back up to 50's. minute later, same thing.

 

In Win 7 this corresponded with spikes in all threads (have tried turning off HT too and didn't work) that were running FSX. Interestingly, same drop in fps in win 8, but the CPU does not max out. HD is not running when it happens. Doesn't matter how high it goes...if I lower the sliders and get fsp in the 70's, still drops to single digits.

 

Assume its in the GPU and will eventually try another one to confirm that, but hoping someone has a clue. I've tried everything I know.

 

Thanks in advance,

Jim

Hi guys:

 

I read through this as I too am having problems with a GTX770 that are killing me. New rig, I7 4770 with the video card. Had problems when it was Win 7 and tried everything, then just upgraded to Win8 and same problem. P3D in Win 7...same problem. P3D is not on the new build, just FSX.

 

This is a clean install of FSX acceleration...no addons, so nothing. Tried Nvidea inspector and some of the common tweaks, same problem before and after. Very simple:

Starting up get the fps I would expect, in the 50's. Have it fixed at 60. After almost a minute (and the same timing every time, so very repeatable), fps just drops to nothing. 20's, then some spikes at 8...teens...does this for about 30 secs, then back up to 50's. minute later, same thing.

 

In Win 7 this corresponded with spikes in all threads (have tried turning off HT too and didn't work) that were running FSX. Interestingly, same drop in fps in win 8, but the CPU does not max out. HD is not running when it happens. Doesn't matter how high it goes...if I lower the sliders and get fsp in the 70's, still drops to single digits.

 

Assume its in the GPU and will eventually try another one to confirm that, but hoping someone has a clue. I've tried everything I know.

 

Thanks in advance,

Jim

 

Have you monitored the GPU temps while this happens?  I'm wondering if maybe the heatsink isn't installed right and the GPU is overheating, throttling, overheating etc. 

 

Another thought is to make sure the ancillary power connectors on the GPU are properly connected...I've seen serious throttling happen when someone forgot to connect the PSU pigtails to the two connectors on the video card.

 

Regards

GPU throttling? Heat issue? Graph your GPU temps.

 

(whoops! Somebody beat me to it!)

Could be hardware issue I guess. Something that I found out in the early days, was that installing all the other rubbish during the GPU driver install caused some serious performance issues. So when installing the driver, untick all the other bollocks, ensuring that only the driver is installed. Sorry if you already new this, but thought I'd mention it anyway. FWIW, I'd be surprised if your card is overheating so quickly after starting FSX, you say within a minute? Like the guys suggest though, check it out. When you say a 'rebuild' do you mean a rig rebuild or an OS rebuild?

Thanks for the quick reply gents. Just ran it and there is no correlation. The drop in fsp happens right on time and GPU temp hovers right around 45C with a high of 47, but no flutter, even when the drop comes back again a minute later. None of the others change with the drop, though the GPU Clk (whatever that is) does peak at 1071 MHz while FSX is on.

The speed you GPU is running. They now throttle up and down according to workload just like the cpu. Your fan speeds should be changing as well.

OS rebuild. It doesn't seem to be the GPU heating since it's not spiking and occurs like clockwork. I'll try installing drivers and making sure the crap is off, but the spiking in CPU seems to be the key. Caused by bottleneck in the GPU?

Very disappointing, and I'm outside the return range so struggling not to eat this. FSX is unusable with these drops.

Problem resolved. Not gpu. Need to set affinity for CPUs to real cores not hyper threaded and issue goes away.