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Old 09-30-06, 03:12 PM   #1
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Join Date: Apr 2003
Location: St Paul, Minnesota
Posts: 4
Default SLi problems

I think it's enabled because Doom3 runs really smooth at highest settings*, but Unreal Tournament 2004's FPS counter has dropped 50%. That also seems weird because there is a visible increase in smoothness of objects, but the fluidity of the motion is not consistent.

* note: In Doom3, I am having intermittant problems as well; sometimes when the screen refreshes (going from menu to 'connecting to game' screen), the screen is wavy. A couple times this locked up the session; I had to ctrl-alt-backspace to kill the X session.

Her's my setup:

Asus A8N32-SLi Deluxe
2GB (1GB PNY CAS 2.5 DDR400 modules x2)
Athlon 64, 3500+ (not o/c)
Sound Blaster Audigy 2 sound
PNY Nvidia 7600GS video cards (same make/model)
SuSE Linux 10.1 (64-bit)
Seagate 300GB SATA-II (3GB/s, 16MB cache, 7200RPM) hard drive.
Antec 550W SLi-ready power supply

System temps run at 39C under load (two Tornado fans; one on CPU heatsink and the other in back)

I reinstalled the Nvidia video driver (8774) and used the command "nvidia-xconfig -sli=SLIAA" to update X; my understanding is that this is the best option to use for games that use more CPU time (such as UT2004).

Nvidia X Power Settings module only detects one thermal meter, but /sbin/lspci | grep -i vga reports two video cards:
03:00.0 VGA compatible controller: nVidia Corporation Unknown device 0392 (rev a1)
06:00.0 VGA compatible controller: nVidia Corporation Unknown device 0392 (rev a1)

Is the 7600GS a poor model for SLi?

Could there be a PCIe or related latency issue I am overlooking? And is the "unknown device" suggesting the nvidia driver can't quite figure out which model it is? (this is odd as Doom3's performance is blisteringly fast, and UT2004 - apart from an appearingly reduced framerate, has detail and depth I've never seen before.)

"Now I know why they call it
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