Overclocking i5 2500K

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Overclocking i5 2500K

Postposted on Fri Jan 28, 2011 12:14 pm

I'm at my wits end. So overclocking Sandy Bridge should be a breeze, but it's not working for me.

So I left the base clock at 100.
Turbo Mode: Off
CPU voltage: Auto
CPU ratio: 38

Just a mild overclock to see if it works, but sadly, no matter what I set the CPU ratio to, when I log into windows it's running at 3.33ghz.

So I played around with the settings for a day.
I turned Turbo Mode on.
Upped the voltage to 1.3 for the CPU.
Set CPU ratio to 40.

What happens is the multiplier gets set at 40, but then the base clock magically downclocks and the CPU goes back to 3.33. At least that's what CPU-Z is telling me.
Asus AI SUITE is telling me the CPU is doing 4.0ghz. How can I be sure?
Am I doing something wrong?

Rig in Sig. Help is appreciated.
i5 2500K @ 4.5GHz / Cooler Master V8 / Asus P8P67 Evo / 8GB G.skill DDR3-1600 / MSI GTX 560 Ti / Seasonic S12-650 / 1TB Spinpoint F3 / Corsair 600T Graphite / those cheap 1440p Korean monitors
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Re: Overclocking i5 2500K

Postposted on Fri Jan 28, 2011 12:25 pm

CPU-z is usually right, though if you left turbo mode on its free to clock it however it wants, turn turbo mode off and work up from a lower clock like 24x.
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Joined: Sat Jun 23, 2007 9:27 pm

Re: Overclocking i5 2500K

Postposted on Fri Jan 28, 2011 12:30 pm

You can run a benchmark to see what is really going on; any one will do. Try it once at stock and once with the overclock that the diagnostic utilities disagree on -- that will tell you whether you've changed anything or not.
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