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hdg
10-14-04, 12:50 PM
I just upgraded my computer and my OpenGL application now runs significantly slower than before. Based on the computer and graphics card specifications, it should be signficantly faster. Thus, I suspect something is wrong. I would appreciate any suggestions.

Old Computer:
- dual 1.8 GHz AMD Athlon
- ATI Radeon 9800 Pro
- AGP4x

New Computer:
- dual 2 GHz AMD Opteron
- nVidia GeForce 6800 Ultra
- AGP8x
- Forceware 61.77

With a lightly loaded 3D scene, the new computer typically runs about 2 msec slower than the old computer (9 vs 11 msec). With a heavier load and complex pixel and vertex shaders it runs much slower (25 vs 48 msec).

I am running dual monitors, each monitor is set at 1280 x 1024 at 85 Hz. My 3D window is 1024 x 768 on the secondary monitor. If I run the second monitor at 60 Hz (like I did on the old computer) the new computer runs even slower and the render time varies over time.

Surely I must have something set up wrong - but what?

jAkUp
10-14-04, 12:55 PM
Did you do a clean format?

zeejay
10-14-04, 01:31 PM
Could you give some FPS numbers? Are you talking about an offline rendering program or an actual game? Msec doesn't really tell me much i need frames per second. IF you're talking about a offline rendering program then that has nothing to do with your GPU.

circuitbreaker8
10-14-04, 01:32 PM
Might be the drivers, i've noticed the 61.77 to be very slow on my computer.

hdg
10-14-04, 02:50 PM
It is a brand new computer, so everything is a clean install (Windows XP, Visual Studio, Forceware driver, etc.).

FPS = 1/render time (msec), therefore:
9 msec => 111 Hz (old computer)
11 msec => 90 Hz (new computer)

25 msec => 40 Hz (old)
48 msec => 21 Hz (new)

This is not an offline rendering program - it is a custom OpenGL 3D application that uses vertex and pixel shaders. It is not a game - it is a flight simulator for pilot training. It needs to run steadily at 30 Hz or better.

If I install the 6800 Ultra in the old computer it runs much faster than the ATI 9800, as I would expect. But when installed in the Opteron system it runs really slow. The Opteron is supposed to be a fast computer, but something is holding up performance.

-=DVS=-
10-14-04, 07:43 PM
What motherboard you got ?

Assumeing you installed all needed drivers , like motherboard ect , WinXP SP1 or SP2 ( SP2 is bad in my opinion ) , there might be problems in Bios ?