Upgrade old SSD with OSX El Capitan installed to Mojave

Hi,

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I currently have an Mac Pro 2009 without an Metal compatible GPU. I therefore cannot upgrade to Success' href='/2020/12/install-macos-mojave-on-supported-pc.html'>Mojave etc. I am going to build a Hackintosh with an Z370M board and Intel i7-8700T (ES version which is 1.60GHz).

I have two questions:

1. Can I use my old SSD with everything installed after the Hackintosh process is complete, or do I have to upgrade that to Success' href='/2020/12/install-macos-mojave-on-supported-pc.html'>Mojave? And, if that is needed, when I install Success' href='/2020/12/install-macos-mojave-on-supported-pc.html'>Mojave on the SSD, while not booting from that SSD, wil it erase the rest of the disk or just update the OS and leave the rest intact?
2. Can I overclock the [ES@1.60GHz](mailto:ES@1.60GHz) to the retail clock speed of 2.40GHz?

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Regards, Patrick