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Do we have a defective 2011 iMac?

Buffsteria

Buffsteria

macrumors regular
Original poster
Jun 9, 2012
227
0
This is my 2011 iMac's Cinebench. It's being reported as a 2 core/4 thread. The i5-2400 3.1 Sandy Bridge processor should be registering as 4 core/4 thread.
cine1v.jpg


This is our 2009 Core 2 Duo 3.06Ghz.
cine2.jpg


The 2009 sure is a lot faster than the 2011 in loading programs and running the OpenGL test. Both are running Mac OSX Snow Leopard. Both are 27". The 2011 has 16GB RAM, the 2009 has 12GB. The 2009 is still faster. By a lot.

I think we got a lemon.
 
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Open Activity Monitor and see if you have stats for 4 CPUs. If you don't, you have a problem.
 
Activity monitor says all 4 are working. But it still makes no sense that it would score so low. Or that the GPU scored so low.

The 2011 has 16GB RAM, the 2009 has 12GB. The 2009 is still faster. By a lot.
 
Buffsteria said:
Activity monitor says all 4 are working. But it still makes no sense that it would score so low. Or that the GPU scored so low.

The 2011 has 16GB RAM, the 2009 has 12GB. The 2009 is still faster. By a lot.
Click to expand...

Maybe the 2009 has SSD and you dont which is a major performance impact
 
Buffsteria said:
Activity monitor says all 4 are working. But it still makes no sense that it would score so low. Or that the GPU scored so low.

The 2011 has 16GB RAM, the 2009 has 12GB. The 2009 is still faster. By a lot.
Click to expand...

If Activity Monitor is reporting the CPUs, then it sounds more likely there's a software problem with the benchmark software, and you should try a different one.
 
You should be seeing 8 processors with Activity Monitor. 4 physical processors each able to handle 2 threads = 8 logical processors. So the system should be 4 cores/8 threads. Looks like your quad thinks it is a dual for some reason. That said though I have no clue if you are reading Activity Monitor correctly without a screenshot. In your screenshots from cinebench the cpu clockspeed doesn't really make sense. If anything the cpu is probably utilizing Turbo Boost.

edit: See correction below
 
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forty2j said:
It's an i5. So it's not HT, and should be 1 thread per core.

http://ark.intel.com/products/52207/Intel-Core-i5-2400-Processor-(6M-Cache-up-to-3_40-GHz)
Click to expand...

Thanks for the correction. Looking at it again the cpu is working fine. From the spec sheet (looking at the 2400s which wiki says is the iMac cpu) the maximum Turbo Boost frequency is 3.3Ghz which is probably single thread. So for 2x 3.1Ghz seems about right.

This is assuming the 21.5" iMac which the OP most likely have.
 
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It's a 27". Both are 27". The 2011 has 16GB of RAM. The other has 12GB.
 
I'm wondering if it's because we uninstalled Lion and replaced it with snow Leopard. I'm going to try again after re-installing Lion.

But that will probably break Headus UVLayout...grrr.
 
Can someone recommend test(s) that new iMac (or Mac) owners should run once they receive their new machines?
 
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