Emulator

What steps will reproduce the problem?
1.Enable Dual core(speed up)
2.Using a AMD cpu to play games(I'm using AMD Althon II X4 620 oc3.25ghz)
3.After a period of time on playing dolphin crash.
4.Tested games:
[WII]Fragile_Sayonara_Tsuki_no_Haikyo[NTSC]
[NGC]Tales of symponia[NTSC]
Others

What is the expected output? What do you see instead?
I expect to enable dual core without crash.
Dolphin version with the problem? Other Dolphin version without the
problem?
The problem mainly occur in [WII]Fragile_Sayonara_Tsuki_no_Haikyo[NTSC],
I have tried to run on r4775,r5457,r5475,r5216,r5598,r5619 win32 version.
All of them get crash when enable dual core.
Disable dual core get through the problem but fps drop 5-6FPS.
Also,I find that [NGC]Tales of symponia[NTSC] and other games will crash
too.
32-bit or 64-bit and any other build parameters?
32-bit
OS version and versions of tools/libraries used?
My system spec:
Window 7 32bit
AMD Althon II X4 620
DDR3 1333 RAM 2GB
NVIDIA GF8800GT 512MB
Installed up-to-date directx runtime,display card driver and vs2008sp1
frameware
Please provide any additional information below.