I am using a G3258 Processor in a DZ87KLT-75K motherboard. Bios is current. Cannot change multiplier. Processor is unlocked from Factory. Very strange. Wondering is it is non-compatible.
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I checked compatibility with this motherboard and the processor and they are not compatible, you can check the motherboards compatible with this processor here:
http://processormatch.intel.com/MotherBoards/CompatibleBoards?componentName=G3258 Compatible Motherboards
The initial (K) in Intel's naming sequence stands for an "Overclocking Enabled" SKU featuring an unlocked multiplier, which offers up additional ways to increase the core clock speed outside a simple adjustment. The Pentium G3258 is a little different and is the only one that does not have the prefix with an unlocked multiplier in this current generation so multipliers will be disabled in the BIOS and that is expected behavior with this processor.
Please read the disclaimer at the button of the following link about overclocking warning:
https://www-ssl.intel.com/content/www/us/en/gaming/overclocking-intel-processors.html How to Overclock Your CPU with Unlocked Intel® Processors
You can see how to overclock this processor at:
NOTE: This link is being offered for your convenience and should not be viewed as an endorsement by Intel of the content, products, or services offered there.