Join Date: Mar 2008
Location: Cali Native in AZ
Whether or not going > your physical vram capacity causes major fps choking is, I believe, largely a function of how good a job the driver does at caching the right textures. I.E. the extent to which the driver does a good job of keeping what textures it needs in the short term present in the card's vram, and leaving the ones it doesn't immediately need on the system ram, is the extent to which the game will continue to perform reasonably well.
Of course, the extent to which it's even possible for the driver to do a good job on this task is going to depend on the design of the game ... things like the draw distance, and how fast you're able to physically get around in the game will come into play.
What I mean is like if your vram usage is pegged out, and you hop in a fast vehicle and race from one side of the map to the other, there's a real good chance you're going to get bad FPS, esp. around the time you reach the end of the journey. Whereas, if you just walked that same distance, there's a better chance that your FPS wouldn't tank.
The mechanism behind this should be sorta self-evident ... the faster the scenery is changing, the more likely it becomes that a texture the game needs isn't going to be cached in the vram, and must be fetched from system ram. And the more textures that need fetching from system ram, the more likely it becomes you'll get memory-related slowdowns.
I've seen games where perf doesn't tank until usage WAY exceeds your physical vram capacity, and I've seen others where there is very little headroom before perf goes down the tubes. It just depends on the game, and how well the driver works with that game.
Little side note: One of the very few things that's 'better' about XP is that, when you run a vram monitoring app (Rivatuner was what I always used) on a game in XP, it will actually show you how much total video memory the game is trying to use, without capping out at whatever amount you have on your card.
I remember back in the day playing SoC in XP on my 8800GTS 320MB card, and seeing 500MB of vram usage in RT. And I found that my perf didn't tank until I went above around 450MB of usage ... which, on a % basis, is pretty significantly higher than my vram capacity. Of course, Stalker games are all walking, so the scenery doesn't change *that* fast ... which def. helps the situation.
Powercolor Red Dragon Vega 56 (Nano-based) With Samsung OC'ing in Progress!
xeon X5675 6c/12t @ 4.1ghz (1.29v, 20x205 +ht) Gen 1 I7 Baby!!!
rampage iii extreme
Powercolor Red Dragon Vega 56 (Samsung) Stock Bios For Now!
hynix 250gb ssd (boot), 2tb deskstar (apps),1tb spinpoint (bu)
plextor px-712sa - still the best optical drive ever
abs sl (enermax revolution) * single 70A rail 850w
corsair h8o v2 aio
LG Ultrawide QHD 21:9 Curved IPS Monitor 3440 x 1440 AMD FreeSync
▲ hide details ▲