Hi,

 

I'm planning a major upgrade of my PC in preparation to FSX switch and GPU is one of the components that will be replaced. I'm currently have i7-950 and GT460 and I'm still using heavy-customized FS2004. The new machine will be build for FSX only.

 

The only concern I have right now is GTX580 that has videoRAM ~ 1.5GB. As we all know FSX SP2 is still 32bit application and it cannot access more than 4GB of virtual memory. As far as learned from many topics here on AVSIM, videoRAM is always a part of this equation for VM calculation. Simply speaking, more video RAM = more risks of OOM in the areas of complex scenery, lots of AI and multy-layer clouds.

 

Perhaps 560 and 570 (both have 1GB and 1.2GB respectively) would be more safe choice in this situation. I know that GTX580 is very good on hi-res textures, but my personal preference is the reliability and stability over the top-notch eye-candy quality. I'm fine with DTX5 textures anyway.

 

Your thoughts are much appreciated. Who know, may be OOM issue with the connection to GTX580 RAM is bit overestimated.

 

Thank you

Dmitriy

Dmitriy

This doesn't apply in a 64-bit OS where all of the 4GB of Virtual Address Space - VAS (NOT virtual memory which is actually aka the paging file) is available to FSX. In a 32-bit OS running a 32-bit app like FSX yes the video memory will take some of the VAS and leave less for FSX. In a 32-bit OS - 4GB VAS is still available to FSX, but 2GB of the VAS is used for the kernel/system and 2 GB minus the VRAM is available to FSX. In a 32-bit OS (only) If you set the /3GB switch in the boot ini then up to 3GB will be available to FSX minus the VRAM, leaving only 1 GB for the system. FSX has the Large Address Aware flag set so can use the maximum of 4 GB of VAS.

The best option - use win 7 64-bit, very small impact by VRAM.

Regards

PeterH

Running 580 here, on 64bit OS, and have 0 problems. I can run my FSX up to 4GB anyday without crashing. As Peter said, not a problem under 64bit OS. I can run LOD 6.5 everywhere too.

i7 950 @ 4.3 with MSI lighting GTX580 OC @ 910 on windows 7 x64 with 2 21 inch montiros, always flying online. 1 PC setup

 

NO problems at all.

 

For example yesterday i was flying PANC-PADU, visual studio 2010 open writing code for an FS App which i was testing back and forth. ActiveSky, FSRealtime and FSInn open.

 

Dont forget to tune your FSX MAINLY with Word Not Allowed's proposal here: http://forum.avsim.net/index.php?showtopic=370594

Thanks for your responses folks. Really appreciate it.

Running 580 here, on 64bit OS, and have 0 problems. I can run my FSX up to 4GB anyday without crashing. As Peter said, not a problem under 64bit OS. I can run LOD 6.5 everywhere too.

Same here and also no problems at all.

No issues here with my 580 and my sliders running on the "Ultra High" preset.