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2500K no turbo boost?

post #1 of 8
Thread Starter 
OK, so I was getting ready to upgrade my SigRig with some new hardware, but before I did I wanted to Benchmark my OCed speed and my stock speed, however, when I load the stock bios, the Turbo Frequency only reads 3393.2MHz, where as when I first built the system it would read around 3700 MHz? Does anyone know why my Turbo Boost is not working as it used to? Also, how can I get it back to working at 3700MHz under turbo?

Any help would be greatly appriciated!!!
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post #2 of 8
By default, the 2500K will run at 3.4GHz when all 4 cores are in use and 3.7GHz when only 1 core is in use. If the turbo boost multiplier option in BIOS is set to AUTO then they should be set to 34x (4-cores), 35x (3-cores), 36x (2-cores) & 37x (1-core) with the clock ratio being set to 33x.
Edited by compudaze - 5/24/11 at 9:57pm
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post #3 of 8
Thread Starter 
Quote:
Originally Posted by compudaze View Post
By default, the 2500K will run at 3.4GHz when all 4 cores are in use and 3.7GHz when only 1 core is in use. If the turbo boost multiplier option in BIOS is set to AUTO then they should be set to 34x (4-cores), 35x (3-cores), 36x (2-cores) & 37x (1-core) with the clock ratio being set to 33x.
OK, that makes sense and I can see that in my BIOS. But that actually leads me to another question while I'm working on this. Now when I run CPU-Z it is giving me a processor speed of about 1.5GHz instead of my Turbo speed (which it used to)? Any ideas?
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post #4 of 8
So we have to set the ratio for all cores in BIOS for a consistent OC?
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post #5 of 8
Thread Starter 
Quote:
Originally Posted by csm725 View Post
So we have to set the ratio for all cores in BIOS for a consistent OC?
I'm not sure what you mean?
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post #6 of 8
Thread Starter 
Still trying to get CPU-Z v1.49 to validate properly and am having no luck. Anyone have any suggestions?
Edited by WonderMutt - 5/24/11 at 11:15pm
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post #7 of 8
Quote:
Originally Posted by WonderMutt View Post
OK, that makes sense and I can see that in my BIOS. But that actually leads me to another question while I'm working on this. Now when I run CPU-Z it is giving me a processor speed of about 1.5GHz instead of my Turbo speed (which it used to)? Any ideas?
When you are idle or virtually no load, EIST downclocks the CPU to 1.6GHz to save power. When you actually need the speed, the CPU automatically kicks back up to the rated speed. There's no reason to disable EIST as it doesn't effect overclocking on Sandy Bridge chips and the change happens so fast it won't affect performance. If you really want to stop it from doing that, disable EIST and C1E in the BIOS.

Quote:
Originally Posted by csm725 View Post
So we have to set the ratio for all cores in BIOS for a consistent OC?
That's how I do it. I set the multiplier for all 4 cores to 48x.

Quote:
Originally Posted by WonderMutt View Post
Still trying to get CPU-Z v1.49 to validate properly and am having no luck. Anyone have any suggestions?
Try the latest CPU-Z (1.57.1) instead. If that doesn't work, you'll have to wait for the next release to support your motherboard. If you are looking to monitor CPU voltage, you may need to use Gigabyte's Easytune for the time being.
Edited by compudaze - 5/25/11 at 1:37pm
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post #8 of 8
Thread Starter 
Compudaze Rep+ for all the awesome info. Thanks!
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LG Modisc XSPC Rasa 750 RS240 plus custom loop Danger Den Black Ice SR1 360 RAD Corsair AF SP120 fans (5x) 
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