Shinhan

My computer freezes often in games. Works fine for a while, freeze for a ~2 seconds and then unfreeze by first speeding up (to display what he forgot to display) and then works normaly for another several minutes.
It shows most obviously in Audiosurf.

Two friends told me the problem was most likely in improper CAS latency times but werent able to give me exact settings I should use.

Now, the setup:
Motherboard is TF570 SLI A2+ with Athlon 64 X2 4000+ CPU
Bios is N57LA-A2T
Memory is 4 * Transcend JM800QLJ (1GB, the packaging says 5-5-5)
(Yes, I am away that WinXP doesnt see all 4GB but only 3.25. I think thats better than 2GB and am not yet convinced switching over to Vista is a good idea.)

The Bios has way too many settings, but I wrote all of them down (current setting is bolded):
CAS Latency: Auto 3 4 5 6
DRAM Command mode: Auto 1T 2T
TwTr Command Delay: 1 2 3
Trfc0 for DIMM0 75 105 127.5 195 327.5
(same for other 3 DIMM channels)
(Twr) Write Recovery: 3 4 5 6
(Trtp) Precharge time: 2 3
(Trc) Row cycle time: 11 to 26
(Trcd) RAS to CAS R/W delay: 3 4 5 6
(Trrd) RAS to RAS delay: 2 3 4 5
(Trp) Row Precharge Time: 3 4 5 6
(Tras) Minimum RAS active time: 5 to 18