|You can't, because they use different sockets. But even if you could, you wouldn't want to. |
The 2GHz Celeron 550 is actually a much faster processor than the 2.8GHz Celeron. The 550 is basically a Core 2 Solo with less cache memory, while the 2.8GHz Celeron is a crappy old Pentium 4 with far less cache.
HTPC | Pentium M @ 2.82GHz, 2MB L2) | 4GB | 1.0TB | Radeon HD5750 | Blu-Ray
Win 7 Pro | HDMI out to Onkyo TX-SR707 receiver & Samsung Series 5/63"