0
yes, but only smoothly if it were an AMD Phenom X4 9950
You can use an amd sempron or an amd athlon II with an am3 socket, but when am3 was released it was meant to be used with the amd phenom line of CPUs.
You can use all three: amd sempron, amd athlon II & amd phenom.
AMD.
1800MHz
Yes, the AMD Phenom II X4 955 is a quad core processor meaning that this processor has four cores or CPUs.