Question Active Processor Cores option not detecting all cores

Feb 11, 2019
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My motherboard is zebronics z55 and I've a i7 870 processor. The option in Bioa of Active Processor Cores shows only 3 options which are "All, 1, 2"
Which means that its only detecting 2 of the cores but it has 4 cores and I get low Fps in games. How do I fix it?