E5 Turbo Boost Speed

renderfarmer

Member
Feb 22, 2013
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New Jersey
Hi all.

I have 7 Romley Supermicro boards (X9DRL-iF-O & X9DRW-iF) with dual E5-2620 (hexa 2GHz) and they all top out at 2.3GHz Turbo Boost in spite of their Max 2.5GHz turbo boost rating. This is under full load using AIDA64 stress test.

Is that typical or E5 CPUs? Is there a set of BIOS setting that I can adjust to get closer to 2.5?
 

rubylaser

Active Member
Jan 4, 2013
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I assume this test is threaded. If so, 2.3GHz is what you should see on that processor. If 1 or 2 cores are in use you can see up to 2.5GHz of turbo boost, 3-4 cores maxes at 2.4GHz, and 5-6 cores maxes at 2.3GHz.

This might explain it more clearly.
 

Patrick

Administrator
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Dec 21, 2010
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I assume this test is threaded. If so, 2.3GHz is what you should see on that processor. If 1 or 2 cores are in use you can see up to 2.5GHz of turbo boost, 3-4 cores maxes at 2.4GHz, and 5-6 cores maxes at 2.3GHz.

This might explain it more clearly.
Exactly. With high thread counts modern CPUs do not hit the top end of their range.
 

PigLover

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Jan 26, 2011
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The Ivy Bridge-EP chips are out in ES versions - and their Turbo Boost works "better". They can achieve higher turbo boost even with multiple cores active as long as thermal conditions allow it (just like the IB 1155 "v2" chips do). Mere mortals like us should be able to buy them soon - if you can afford them!

But for now it does appear your Sandy-Bridge E5 is working as expected.
 

renderfarmer

Member
Feb 22, 2013
249
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New Jersey
Thanks, everyone. That's what I thought but it's good to get confirmation that theverything is working like it's supposed to.

I assume this test is threaded. If so, 2.3GHz is what you should see on that processor. If 1 or 2 cores are in use you can see up to 2.5GHz of turbo boost, 3-4 cores maxes at 2.4GHz, and 5-6 cores maxes at 2.3GHz.
Yes, this is with all 24 physical/logical cores maxed out. Thanks again.