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SLI On or Off?

O

ohnnyj

Golden Member
Hello all:

This may be an observation more than anything else. I have a pretty good sytem (FX-55, 2GB RAM, Raptor RAID0, 2 6800GTs, etc.) and get very good framerates in Half Life 2...for the most part. Right now I am running at 1920x1200 2xAA 8xAF Reflect All and get consistently good framerates. However, and I have commented on this before, is that at some points in the game the framerate will drop to the 20-30s for no aparent reason, even when there is little to no action going on. What I have found is that if you do a quick save then reload from that save the framerate will skyrocket back to normal levels.

I have posted two pics comparing this phenomenon at my site which can be viewed here:

Framerate Low
Framerate High

I have posted this question elsewhere and some people believe this may have to do with caching, as in Half Life 2 is loading up game files and causes stuttering. Therefore, I am wondering if this is the same thing that many have been complaining about or if SLI is being temporarily disabled. The latter seems rather odd as why would in the middle of running a game would saving/reloading have anything to do with SLI (then again everyone knows that it is still in beta). This is rather annoying as I don't know when/if SLI is working and when it is/is not working. Or if it is a different problem, as in software based, with the game.

Anyone else experience this? Even w/o an SLI system? Tried the save/reload technique?

Thanks.
 
don't mean to make jest of your situation but I sure am glad I did not get caught up in the SLI bandwagon. I'll just get SLI later down the line.
 
That's just the thing, though, I don't know if it is SLI or the Source engine. I have been hearing competing views.
 
I would run Performance monitor in the background taking a snapshot of your processes, Processor, etc (not too many at once) and capture it to a log. Then analyze the data after you play HL2 to see what is interfering. Everyone here will say SLI is the problem. I would find the real problem which sounds like something is polling or spiking in your system. I have to troubleshoot the same problems here at work with our servers.

If nothing shoots out as an obvious process that is looking for attention, then try again with SLI on and off and look at it again. Maybe capture every 10-15 seconds or something like that.
 
But why would saving then reloading make the framerate jump back up? I have talked with other people on different forums that say this fixes the problem for them as well.
 
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