CPU permanenttly works on half of clock
I encountered with problem and I have absolutely no idea how to resolve it.
I have an iMac mid 2011 27" with core i5-2400 (3100MHz) radeon 6970-1gb HDD 1TB .
My HDD had broken, so i decided to install SDD instead of it. So I replaced old hard disk and put ssd Crucial MX200 500Gb instead. I installed Mac OS 10.7 from scratch using embedded recovery system, and after what updated to 10.11.5.
Everything was fine until I decided pass some benchmarks. And all benchmarks show that cpu results only a half of expected. E.g Cinebench R15
I tried to figure out what the problem and install Intel Power Gadget utility.
It reveals next - CPU frequency does not rise higher than 1600MHz even in 100% cpu load tasks. It freeze on 1.60GHz a not move even a bit. The line on the graph is absolutely flat!
And there are no CPU overheat as all! Temperature not raises more than 50C degrees.
And GPU also work at ~20% of it power according to benchmarks (two times less points than ge-force 620m has).
I have no idea how to resolve this issue. Please share your experience in such cases
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