framerates again

[CAP1]

hey guys.....question.........nor mally my machine doesn't dip below 65fps......IF it goes that low. tonight in lw, it dropped into the 30's. in fso, in a big battle.....but not any bigger than i've been in before, it dropped into the lower 20's. it's never done this before.
 the only thing i notice different lately, is that in task manager, there's some nvidia stuff loaded that i never used to see. i suspect that it updated, but not sure.

 i don't know what other info to give to help you guys give me suggestions........
 thanks!!

[guncrasher]

do you have vsync on or off?


midway

[CAP1]

do you have vsync on or off?


midway

 in the game, i think it's off.......i don't recall ever turning it on.....

[guncrasher]

it's on by default.  make sure it's on.


midway

[MrRiplEy[H]]

Vsync being on can cause drastic changes in FPS. If the GPU can't manage to sync to 60hz it drops to 30, then to 15 etc.

If you experience symptoms like this, try altering the triple buffering setting in the graphics card setup. Try it forced on and forced off, it may fix the drops in fps. I recall Skuzzy saying that triple buffering was enabled by dfault in AH2 but at least I had a case where forcing it on fixed bad framerates.

[TwinBoom]

I am not sure how HTC uses Z-buffer, but it basically is a function of controlling the level of detail in the distance.
The Z-buffer depth (8,16,24,32 8 bit stencil) all refer to the largest number for calculating the LOD for any given distance, relative to your camera position in the game.
The lower the number of bits, the less detail is displayed as objects move further away from you.
Generally speaking, the higher Z-buffer depth you use, the lower your frame rates will be, as the video card must do more calculations for each given texel is needs to render.  The tradeoff is the detail level of all images that are in the distance.  Distance is all relative and pretty much up to the software that is running on your computer.
Again, I do not know how HTC/AH uses the z-buffer, but that is generally what it is.

Triple buffering: Modern day video cards have 2 frame buffers on-board.  One is the frame that is currently being sent to the monitor, the other is the one that the video card is currently rendering and will be displayed next once the other frame is done (this action depends on how v-sync is setup) done.
With triple-buffering, another frame is created in system memory, which is comprised of all the unrendered objects for that frame.  This allows software to prepare a frame of data to blast to the video card once the video card has a free frame buffer.
Generally speaking, for slower video cards it helps increase performance, as the software/CPU is no longer waiting for the video card to clear a frame buffer for the next frame draw.
Faster video cards, particularly the ones that are faster than the CPU can take a frame hit when triple buffering is enabled, as the CPU is spinning its wheels preparing a frame, instead of firing off the data to the card.
Again, I do not know how HTC/AH handle this, as there are many ways it could be handled.
This is usually an option you need to try, before determining which (on or off) gives the best display performance.  Performance, in this sense is regarding the frame draws, not the frame rate (i.e. is panning smooth? is movement of images smooth?).

Hope that helps.


------------------
Roy "Skuzzy" Neese
President, AppLink Corp.
http://www.applink.net
skuzzy@applink.net