On the top of every Intel processor is the sSpec Number, and the part number.
Intel Core2 Quad, that operates at a maximum frequency rate ('Speed'), of 2.66GigaHertz,.........hmmm,
Gateway Support indicates if the option is a Core2 Quad core, it will use Up To a 1333MegaHertz, Front Side Bus frequency rate, ('Speed'),
That 'narrows' it down to about 6 different processors.
Starting with the Yorkfield-6M Core technology, based on the 45NanoMeter architecture. (45nm),http://en.wikipedia.org/wiki/List_of_Intel_Core_2_microprocessors#.22Yorkfield-6M.22_.2845_nm.29
1) Core2 Quad Q8400
2) Core2 Quad Q8400S
3) Core2 Quad Q9400
4) Core2 Quad Q9400S
Then on to the Yorkfield Core technology, based on the 45nm architecture,http://en.wikipedia.org/wiki/List_of_Intel_Core_2_microprocessors#Yorkfield_.2845_nm.29
5) Core2 Quad Q9450
6) Core2 Quad Q9450S
The maximum frequency rate of 2.66GHz, is actually a low estimate. It is a little higher, and rounded off to 2.67GHz.
BIOS Setup might state 2.66GHz, but a better program like CPU-Z, IMHO; will state 2.67GHz. A more realistic figure.
Does it REALLY matter? Yes, and No.
This way when you get into a conversation, with fellow minded computer geeks, you will stand out as one who knows; what hardware components he/she is using.
Also helps you determine what voltage range is being used.
What Instruction Sets are being used.
What technology is being used, and use it to know if the upgrade CPU will indeed work.
Also whether a BIOS upgrade is needed.
I'm guessing it is the Intel Core2 Quad Q8400.
I cheated, lol!,http://www.newegg.com/Product/Product.aspx?Item=N82E16883113110
Intel Core2 Quad Extreme at a maximum frequency rate of 2.93GHz?
That would be the Intel Core2 Quad Extreme QX6300,http://en.wikipedia.org/wiki/List_of_Intel_Core_2_microprocessors#Yorkfield_.2845_nm.29
Based on the Kentsfield XE technology, and 65nm architecture.
Uses a 1066MHz FSB.
Motherboard chipset is the Intel G43,http://en.wikipedia.org/wiki/List_of_intel_chipsets#Core_2_chipsets
(Scroll down. Is not in 'alphabetical order'. It is past the P45, and G41 )
Yep. Should work.
Makes me wonder though, about how you addressed the Thermal Paste; situation.
The old Thermal Paste MUST be THOROUGHLY cleaned off, and fresh, new Thermal Paste PROPERLY applied.
CANNOT reuse old Thermal Paste.
CANNOT reuse a Thermal Pad, IF used.http://www.hardwaresecrets.com/article/274
Do I also assume the inside of the computer case is spotlessly clean, to include the Heatsink sitting on the CPU; and the cooling fan for it?
Heatsink was sit on CPU flat?
Cannot be even a little tilted.
For this reason I remove the motherboard, and install Heatsink.
Then I can hold the motherboard at eye level, and look across.
If a tiny crack of light shows on one side edge, of the Heatsink; then the Heatsink is NOT sitting flat.
This = No.
Four screws with springs on them, hold the Heatsink to CPU, Joe?
Yes. I know. This is so you cannot over-tighten the Heatsink to CPU.
You CAN however keep tightening, until the motherboard breaks, though. (Jus sayin')
However, if the screws are not tightened in a crisscross fashion, and tightened in incremental stages; the Heatsink may not be sitting flat.
Will await reply before going further. Post back in a Comment.
Note* Using capital letters for an entire word, is not 'shouting' from me.
It is to emphasize.