Doom 3 FPS all over the place with 6800GT

[bigbangtech]

I'm having some weird FPS results from the Doom 3 time demo(precached of course). I consider 1600x1200 the baseline, and below that resolution things don't seem to be speeding up too much. Now I know I may be cpu-limited, but 1280x1024 just falls flat using a higher AA setting, while lower resolutions don't commit suicide as badly. Anybody have any ideas?

640x480 800x600 1024x768 1280x1024 1600x1200
0xAA 56.7 - 54.7 - 47.1 - 56.5 - 54.2
2xAA 55.8 - 53.1 - 43.9 - 31.8 - 50.3
4xAA 55.1 - 49.7 - 39.0 - 27.2 - 40.9

Here's a graph chart in .gif format

Shuttle AN35N-Ultra 400
Athlon XP 2500+ Barton @333
1.5GB Nanya PC3200 @333 Dual Channel
EVGA 6800GT Clocked to 400/1100 using coolbits 2.0
Forceware 65.73

I repeated the tests three times and got the same results within 2%. The 6800gt is running at 70c under load.

 

[jiffylube1024]

Originally posted by: bigbangtech
I'm having some weird FPS results from the Doom 3 time demo(precached of course). I consider 1600x1200 the baseline, and below that resolution things don't seem to be speeding up too much. Now I know I may be cpu-limited, but 1280x1024 just falls flat using a higher AA setting, while lower resolutions don't commit suicide as badly. Anybody have any ideas?

You're CPU/RAM limited! Enough said! The 2500+ (1.83 Ghz) just isn't fast enough to keep the card fed, and the memory bandwidth of NF2 at 333 Mhz isn't helping too much either.

Athlon 64 or P4 C would be a much better match for that fast GPU.

 

[bigbangtech]

Being cpu lmited doesn't explain the framerate at 1280x1024 dropping like a rock with AA enabled and 1600x1200 not doing as bad.

 

[BFG10K]

It could be a driver issues - try the official 61.77 drivers.

You think that's weird, some benchmarks I've seen on my 6800U run faster with 4xAA enabled than they do with them off!

 

[Lord Banshee]

Also looks like you have Vsync Enabled. If you didn't turn it off under the Doom3 Setting in Doom3 you should do that.

 

[Bateluer]

I just tried to run a Doom 3 time demo using the default demo001. For some reason, it starts to load, then errors out in the control because it cannot find the demo file in its directory. Odd.

 

[Cawchy87]

timedemo demo1

and to the OP. Why worry about timedemo's? You spent all that money to play the game didn't you?

 

[bigbangtech]

vsync was disabled everytime, and is disabled by default in doom3 I believe. I'll try the 61.77's tomorrow