I might have a fix for some of you.
I have had the problem with sins that after a while of playing, the game suddently freezes. (can be anything from 5-15 minutes) I get large pixels all over the screen and the only thing that is left to do is turing the computer of on the start button. This error never occours on new high end games, but does for Sins of a solar empire, Quake 3 and for some games that have really bad graphics.
For my system it "appears" that I have fixed it. (this is only for people with the same error and with a ATI Radeon card)
(I managed to play for more than 30 minutes without anything going wrong. I will try for longer later on, and will post again if the error appears again)
My system specs are:
Vista Buissnes 64X
Intelcore 2CPU 6400 2.13 GHz
6 Gig RAM
ATI Radeon Sapphire HD4870 512Mb GDDR5 PCI-E
My problem was with my graphic card that was "to good". My ATI card comes with ati Cataclys Controlcenter. As all Radeon cards has. Just start the program, pick "advanced mode", then "ati overdrive"
There you can see options for GPU clock and Memory Clock. This section is there for people to get more power out of their cards. Mine has "GPU 750Mhz" "Memory clock 900Mhz" as default.
So instead of overpowering my card, I tried to lower its output instead. I changed my GPU clock down to: 580Mhz and my Memory clock to: 600.
And like I said, I have been able to play the game for a long while without getting the problem again. So its possible that this fixed it for my system. And the card is still powerfull enough to run the game on max settings. And the game I tried was with 8 computers. I hope it will work with few opponents aswell.
I hope this helps someone