Strange Core Specific Turbo Frequencies

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saquist

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Nov 20, 2011
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I'm attempting to upgrade my Current System and the turbo frequencies are confusing.

Current Mother Board: ASUS Z9PE-D8 WS
http://www.cpu-upgrade.com/mb-ASUS/Z9PE-D8_WS.html

Processor Choice #1: Intel Xeon E5-2687W
http://www.cpu-world.com/CPUs/Xeon/Intel-Xeon%20E5-2687W.html

Processor Choice#2: Intel Xeon E5-2667 v2
http://www.cpu-world.com/CPUs/Xeon/Intel-Xeon%20E5-2667%20v2.html

Future Mother Board: ASUS Z10PE-D8 WS
http://www.cpu-upgrade.com/mb-ASUS/Z10PE-D8_WS.html

Processor Choice#1: Intel Xeon E5-2687W v3
http://www.cpu-world.com/CPUs/Xeon/Intel-Xeon%20E5-2687W%20v3.html



-Something Strange is going on with 2600 family as I look at these processor turbo speeds at CPU World. apparently max turbo only applies to ONE of the CORES.

-On the Upgraded board the CPU E5 2686W just has only one turbo frequency.


Question 1:
Does that mean the 2600 processors turns off the other cores and only one core operates during turbo, or do the other cores only operate at the base frequency while one core operates at max frequency?

Question 2:
Does the e5 - 2687W turbo frequency apply across all the cores?

When I look at the comparison of the CPU's on CPU BOSS there isn't a considerable difference in their performance like one would expect if the E5 - 2687W were operating at all cores.

http://cpuboss.com/cpus/Intel-Xeon-E5-2687W-v3-vs-Intel-Xeon-E5-2667-v2

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My Current Full System Specs.

SYSTEM:
BIOS: 5304
Z9EP D8 WS ASUS Motherboard
2X Processors E5 2630 2.6 Intel Xeon
Corsair 1600 DDR RAM 4 x 8 Total 32 GB
980 GTX Nvidia Cards
PSU 1200W RT Corsair
2X Samsung 520 GB SSD
*1 Non Functional Western Digital Harddrive

Current Cinebench R15 Score: 1574 operating at an overclock of 3.5 MHz
My objective is to get into the 4.2 MHz range for the upgrade.


 
Solution
Barty1884
1. It's not so much "turn off" the other cores, but the boost clock speed is directly related to the number of cores in use by a given application - single threaded applications will always see the most benefit, as the "fastest" core will be doing the work.

2. I don't believe the 2687W v3 will turbo boost all cores. There just appears to be less information available for it.
as per Intel ARK, the "max turbo boost" is 3.5GHz, but I'd be very doubtful as to whether that's what happens across 10 cores/ 20threads. http://ark.intel.com/products/81909/Intel-Xeon-Processor-E5-2687W-v3-25M-Cache-3_10-GHz

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Barty1884

Barty1884

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Apr 16, 2015
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1. It's not so much "turn off" the other cores, but the boost clock speed is directly related to the number of cores in use by a given application - single threaded applications will always see the most benefit, as the "fastest" core will be doing the work.

2. I don't believe the 2687W v3 will turbo boost all cores. There just appears to be less information available for it.
as per Intel ARK, the "max turbo boost" is 3.5GHz, but I'd be very doubtful as to whether that's what happens across 10 cores/ 20threads. http://ark.intel.com/products/81909/Intel-Xeon-Processor-E5-2687W-v3-25M-Cache-3_10-GHz

 
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Solution
bicycle_repair_man

bicycle_repair_man

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Jan 10, 2014
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Turbo Boost never applies to all cores, unfortunately, and Intel don't make that fact completely clear. Typically, Turbo Boost will only run when a single thread is being heavily utilised and the others are idle; this is to keep the CPU within heat tolerances. The only way you'll get a higher-than-base clock speed across all cores and threads is to overclock.

To answer question one, yes, the other cores will run at the base clock speed or lower when Turbo Boost is running.

To answer question two, no, Turbo Boost doesn't apply to all cores.
 
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