P7550 and P8400 for MBP 13" mid-2009

seong

macrumors 65816
Original poster
Feb 11, 2010
1,031
28
I see two processors.
P7550 and P8400 for both MBP 13" mid-2009.
My sister's comp has P8400 and I have P7550.
What's the real difference?
I saw two threads about this, but no one had the REAL answer.
Anyone smart enough to know this?:confused:
 

Hellhammer

Moderator emeritus
Dec 10, 2008
22,164
581
Finland
AFAIK, Apple used only P8400, not P7550. P7550 came a year after P8400 so it's likely just cheaper due more efficient stepping (R0) than first two revs of P8400 which had C0 and M0 though the current rev uses the same R0 stepping. The biggest difference I can see is that P8400 have two versions, for BGA479 and PGA478 sockets while P7550 supports only PGA478. Also, P8400 supports VT-x which improves virtualization performance while P7550 does not support it.
 

Nice

macrumors regular
Mar 17, 2010
112
10
so which one is "better" ? i have in my mbp 13 the 7550
 

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