about a month or two ago i sold my Q6600 on ebay for 160$ and bought a Q9400 for 165$; power savings will make it pay for the upgrade. A 9550 is not a BIG upgrade, in fact it is quite a minor upgrade... I would say it REALLY depends on the price you are getting.
Don't expect it to be much faster though.
Intel does tick-tock cycles. the shrinking just means cheaper and lower power consumption, not faster. the redesign phase is where the speed gains are made (ex: i7)
On the 24th intels new 34nm SSDs hit the market, faster than the current X25 models, for less money.
Honestly, I wouldn't even consider upgrading the CPU from what you have before grabbing an intel SSD. (extremely cheap side grades are ok though)
And for CPU upgrade I would wait for the P55 mobos.
As an OVERCLOCKER I don't think you should even consider the i5. Only the i7 and i3... why?
well here are the differences:
Originally Posted By: taltamir
an i7 for a desktop is defined as a quad core with hyperthreading (8 threads).
an i5 is either a quad core with no HT (4 threads) or a dual core with HT (4 threads)
an i3 is like an i5, only with turbo mode disabled.
Laptop definitions are different than desktop definitions.
The P55 will have an i7, which actually has some advantages (along with some disadvantages) over the X58 i7. it is a slightly different design but it should compete well. and be less expensive.
the differences between P55 i7 and X58 i7:
1. memory channel: X58 is triple channel DDR3. P55 is dual.
2. P55 will have a single full speed video card connection, or two half speed connections. X58 has two full speed connections. So if you run SLI/xfire X58 is better
3. P55 has the pciE video connection integrated into the CPU, improving latency. As long as you only use one slot (so you get full speed connection) than the P55 will actually be FASTER than the X58.
4. turbo mode: there are unconfirmed reports of P55 having greater turbo mode boosting.
While triple memory channel is good for a high IO fileserver, it makes no difference in GAMES and regular programs.
So for a gamer: 1 makes no difference. 2&3 mean X58 is better for multiple cards, P55 is BETTER for single card. and 4, if true, means that P55 is much better for video games.
As you can see, with i5 you give up on hyperthreading (or two cores). With i3 you give up on turbo mode, except you are an overclocker, so you turbo mode is redundant.