2011 27" IMac CPU upgrade

[CY Yong]

Hi,
My spec is iMac (27-inch, Mid 2011)
I had upgrade my CPU from 3.1 Ghz Intel Core i5 to 3.4 Ghz Intel Core i7 successfully.
I had reset the NVRAM as well.
But I can feel is slower compare to i5, and the cinebencz score also 30% lower (i5 = 2400 its, i7 = 1670 pts)

Does anyone know the problem is come from where?
Thanks a lot for you all help in advance.

 

[ElCani]

Can't really help in terms of what might be wrong, but to answer the question you asked on the iMac GPU upgrade thread, you shouldn't need to do anything settings-wise after installing the new CPU. Are you sure you're running Cinebench with nothing else running at the same time? Check Activity Monitor for other processes that might be using the CPU.

 

[CY Yong]

Can't really help in terms of what might be wrong, but to answer the question you asked on the iMac GPU upgrade thread, you shouldn't need to do anything settings-wise after installing the new CPU. Are you sure you're running Cinebench with nothing else running at the same time? Check Activity Monitor for other processes that might be using the CPU.

Ya, i had restart and kill all the other program before start the cinebench test.
Is that any possibility that the i7 core is damaged which make it slower than i5?

 

[kschendel]

Is that any possibility that the i7 core is damaged which make it slower than i5?

No. I suppose it's possible that it's not being clocked at full speed somehow, although I don't know how that would happen. Maybe try downloading a tool along the lines of "Intel Power Gadget" (if it will work on that machine) to get an idea of actual clocks in real time.

 

[CY Yong]

No. I suppose it's possible that it's not being clocked at full speed somehow, although I don't know how that would happen. Maybe try downloading a tool along the lines of "Intel Power Gadget" (if it will work on that machine) to get an idea of actual clocks in real time.

Interesting, you mean we can adjust/clock the intel core chips?

 

[kschendel]

Interesting, you mean we can adjust/clock the intel core chips?

Not that I know of, but I have no idea what's going on in the BIOS. I was suggesting measuring, not adjusting.

 

[CY Yong]

Not that I know of, but I have no idea what's going on in the BIOS. I was suggesting measuring, not adjusting.

Ok, thanks for your advice. i will try it and post the result over here

 

[Roman78]

Did you perform a PRAM-Reset after replacing the CPU?

And did you check the temperature?

 

[CY Yong]

Did you perform a PRAM-Reset after replacing the CPU?

And did you check the temperature?

Hi,yup. I had done the PRAM-set.
I finally found the i had knock off the L5500, i'm trying to buy solder iron and wire to solder it back