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[OS X] iMac Compatible CPUs Part 2

I couldnt reply to the original thread so I created a new one to ask a follow up question. Neither can I PM or email the gent. Really apologize for duplicating threads.

Original Topic: »iMac Compatible CPUs

skeechan: With the QX9300 socketed into your iMac8,1 it would not boot up? Did you happen to buy other Socket P processors for another attempt?

Socket P processors I was looking at for my iMac7,1 are the ff:

2.53 GHz Core 2 Extreme QX9300
2.27 GHz Core 2 Quad Q9100
2.00 GHz Core 2 Quad Q9000
3.07 GHz Core 2 Extreme X9100
2.80 GHz Core 2 Extreme X9000
2.80 GHz Core 2 Extreme X7900 (confirmed)
2.60 GHz Core 2 Extreme X7800
3.07 GHz Core 2 Duo T9900
2.00 GHz Core 2 Duo T7300 (confirmed)

I chose Socket P's that are either extreme, quad core or exceed 3GHz. I did this to make the teardown worthwhile. May also install a 4TB Seagate Barracuda 7200.14 when it comes out as I project it to be as fast a 1TB WD VelociRaptor when it ships. 160+MB/s read/writes seems nice to have. I would go SSD but the SATA port is 3Gb/s. Would have been nice if all the SATA ports were 6Gb/s but the standard was ratified middle of 2008 so 12 months too late for me.

iFixIT has my specific iMac fitted with a T7300 upgraded to a X7900. The TDP of the processors differ (35w vs 44w) but share the same FSB at 800MHz.

»www.ifixit.com/Answers/View/5321 ··· 7900+%29

Could it be that the QX9300's FSB is too fast at 1066MHz or the TDP being 45w?

Anyway this is just a preventive maintenance question as I would probably be changing the HDD when it dies. May as well upgrade the processor when I swap out the dead HDD.