SMPS whit UU ferrite

Good day to the whole group Do it yourself! These days I was studying a little switching power supply systems and from mouser I bought this type of ferrite of category N27 and I also got Epcos N87 ferrite from RS component! Have anyone ever used this type of ferrite! I tried them and the ferrite winding you see in the picture delivers 110V and with a load of 600w it is very stable! But how much power can I make these ferrite cores deliver?I'm making them work in push pull at a frequency of 40khz
 

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