I guess I could have said this a little differently, but the Intel® Xeons® that use Socket 771 such as the Intel Xeon 5000’s, 5100’s, 5200’s, 5300’s and 5400’s share a common microarchitecture with the Intel Core 2 Duo’s and Intel Core 2 Quads. While there are some differences they have the same microarchitecture. Now the Intel Xeon 5500’s and 5600’s share the same microarchitecture with the 1st generation Intel Core processors of which the Intel Core i7’s share the same socket but are not always compatible from one board to another. Processors sharing the same microarchitecture do not mean that they are compatible with other processors with that same microarchitecture.
Christian Wood
Intel Enthusiast Team