With the next-generation Core i7 CPU's looming, Intel will update the Q9550's stepping to version E-0 come the 22nd of August. Changes are listed below.
As the Core i7 quad-core processors are closing in Intel is set to move its Core 2 Quad Q9550 parts from the current C-1 to the E-0 stepping. The first E-1 Q9950 CPUs will start shipping on August 22nd and they will feature Halide free packages, new SSpec and MM numbers and a fresh CPUID - 0x1067A (the C-1 ID is 0x10677).
Apart from those above, the new stepping will not include any other changes but a BIOS update is required to ensure full support for the E-0 CPUs. 
