The 955BE quad core is less expensive than the 1100T 6 core. Tom's Hardware ranks it about the same in their hierarchy charts, although it is a little behind in actual benchmarks. The 955BE also lacks the turbo mode included in the 1100T, but is still overclockable. Given your older motherboard, you may wish to weigh the pros and cons of overclocking. As board components age, their ability to handle overclock diminishes.