Inxi is correct here - Intel Core i7-8550U supports v3, => it supports v2 too.
For your old GA-790XTA-UD4 + AMD Athlon II X2 250: you can change mobo to AM3+ socket and install AMD FX-4100 … AMD FX-8370 CPUs, which support v2.
OFC, AM4 socket and CPUs are much better.