I also have 2 x 512MB sticks of TWINMOS here, and running 1T with memtest #8 reboots the machine exactly the same as it does with the 2 x 1GB Corsair value RAM
But I's guess that running 1GB not 2GB probably gives you greater chance of success with 1T
But I's guess that running 1GB not 2GB probably gives you greater chance of success with 1T