Depends on the game, you would maybe see 20% improvement int eh best of situations with crysis...
With that CPU single didget scaling in most games wouldnt be out of the question.
Going the 3ghz should give you substantial gains.
So you would agree that going with the new CPU would give me pretty big gains? What do you think though is causing me to lose frames in all games I play (Fallout 3 @ 1920x1080 w/ 8x AA and Ultra settings, Crysis same, HAWX DX10 Super High Settings, etc.)?
I ran in to the a similar problem when I sat up xfire, didn't see a performance gain in my games and eventually found out I wasn't using xfire at all. There are some things that you can do to make sure you are using xfire.
First, go into your system tray CCC icon and enable the ATI xfirex symbol so you actually know if it is kicking in or not. That will get rid of any doubt if it is actually running or not. When you start a 3D app, you should see the ATI symbol in the upper right corner of your screen. A second way to check is to benchmark with 3DMark06. You should see a healthy bump in your score when 2 GPUs are in play (and the ATI symbol if you enable it...two birds with one stone).
Second, you have to have two things selected in CCC to have xfire work. The first is obvious, under Crossfirex settings, enable it. The next is usually not too clear. In the 3D settings you have to have Catalyst AI enabled. Set the slider to standard.
I would also remove ALL video drivers (NV, ATI, Intel...ect...ect..) through add/remove programs, restart, delete ALL ATI, NV folders and then reinstall 9.4 freshly. Sometimes installing ATI drivers over one another or after having NV drivers doesn't work out the best.
I'm reinstalling Vista x64 Ultimate right now (had x64 XP but it kept crashing for some stupid reason) and I will see what happens.
As far as the ATI symbol on during 3D Apps, I've never heard of that or seen that. Is that bad? Not saying I don't believe you I just wonder if that's why b/c I've never seen anything like that show up before.