No. The 870 is an 1156 LGA, so needs new memory, motherboard and CPU. The new hex core is even worse value than the extreme, as at least that was unlocked.
The 930 is still probably the best value 1366 chip, but with the price cuts on the i5, that would be the CPU of choice on the P55 boards.
i7 5960X 4.5GHz -EK Supreme EVO - Asus - X99-WS-E - 32GB 2400MHz RAM - Titan X EK Cu Block - Creative Titanium Pro - TJ07B-W - Plextor 240GB PCIe SSD - 3TB HD - Dual Loop