I did it by using CRU utility by ToastyX and adding a detailed resolution, restarted driver and selected 72 hz on advanced settings. Boom, it's working. I restarted my system even to be sure things work good. Seems it's fine (I did it today), but I wanna make sure it's not too extreme for this little oldie of mine.

According to AIDA64, maximum pixel frequency is 170mhz (Currently running at 129.60mhz with the overclock), and vertical freq is 76hz, and seems energy consumption is 28W

Also I would like to know if it will consume much more power with this slight overclock (if it's considered even an overclock given what the manual and AIDA64 tell me, supposedly, it can run at this without problems…)

Link to manual:
https://archive.org/details/manualsbase-id-82607

Thanks in advance for any info.

Cheers!