Having nearly no heavy scenery or airports addons, but just ORBX FTX Global series, pay- and freeeware meshes, various aussie or kiwi freeware airports, no blowtorch liners, but a fair bunch of freeware small to medium size aircrafts (although some of them are pure jewels even possibly above payware quality) for VFR or bush flights, I have gone the v4 way without regrets, just keeping v3 for ORBX data transfer when FTX Vector and the freeware airports packs will be released for P3D v4.
Even if an 8Gb video ram is recommended, I can tell you that my HD7870 with 2Gb RAM performs correctly without exceeding the range 67 to 70°C. Only getting here and there a "part of second" freeze, assumedly when a pile of textures etc... are sent to the graphic card, and in standard cloud coverage, I can maintain a rather stable 30FPS (my freely decided FPS limit as I also fly MP).
Of course, not all sliders are maxed to upper limit, only part of them. When the budget allows, will go for a more powerful graphic card, and push the sliders somehow more to the right.
Thanks the 64bits structure, my 16Gb RAM now shows what it can bring to simulation!
My only regret is that I have to send to the flight museum some FS9 and FS9 ported to FSX aircrafts which could survive into P3D3, but not into P3D4 (Bücker Jungmann 131, Junkers 52, George Diemer amphibians or flying boats fleet amongst others) and for some FSX or early P3D aircrafts, have to wait for the release of 64bits coded gauges (.gau, .dll, dsd_sound_xml, etc...) to get back all existing sounds (MJ C-47, AlouetteIII, amongst others).
For some other of my favourites (MS D18S specifically), Milton released already an FSX native version of his amphibian, and is working now on the wheeled version, which will, when released, make me a fully happy man, as liveries for the former version (I have some 25 in the hangar) will work fine on the new FSX native, normally.
So, no regrets at all, as all what I could check up to now is far better for me than the previous opus, and I still have a lot to discover about the v4.
Blue skies, folks
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