I'll ditto Graham, yes it's 400MHz faster and has a 12MB L2 cache instead of 8MB. No, I have no experience with the 9550 but it's just an incremental increase and to spend some $240 for that is just not worth it IMHO.
I only upgrade when the tech jumps a significant amount, like getting an X2 to replace my single core(same mobo) or up to a quad this time, significant gains in speed each time. I'll be getting an i7 next year when the prices hopefully come down a bit. I'll happily stick to my now lowly Q6600 until then. (You know I'm a power hungry user and severely itch for more power!.
) Here's a screen just to let you see how choked my quad is ATM.:D It is still very responsive at this load for regular things.
Everything that irritates us about others can lead us to an understanding of ourselves. -- Carl Jung
eVGA X58 tri-SLI, i7 930 @ 3.8GHz., Corsair 6GB Dominator, Inno3D GTX470, eVGA260
ASUS P8P67 Pro, i7 2600K @4.60 GHz, 8GB RAM, eVGA GTX 460