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Turbo Speed Problem with i7 4790 on Extreme VI

Level 7
Hello @ all,

I have a problem with the new BIOS 1603 and the speed of my 4790. Since the update, the CPU has a fixed multiplier on 38 @ FSB 100MHz. But the default multiplier by the CPU is 36 and the boost multiplier 40. If the system did nothing the multiplier was set down to 8 in older BIOS versions but yet it is fixed @ 38.
In the BIOS is all set to "Auto" for the CPU. For a test I have edit all core ratio values to there standards like core ratio min to 8 and core ratio max to 40, but the multiplier is always fixed on 38.
I think the BIOS is incompatible with my CPU or I do something wrong.

Kind regards


Level 13
Hi Stefan1990, and welcome

There have been several reports of that sort of problem with BIOS v1603. Most have been cleared up by reverting to BIOS 1505. Since you are using a 4790K Devil's Canyon, be careful not to revert back too far. IIRC 1505 is the first version compatible with 4790K.


Level 7
Is Intel Speedstep on?
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