MrCosta96

get a cheap 5700 while you can and flash the vbios tbh, they aren't going to be around forever, AMD is chasing margins, but the AIB cards (reference or fan design) still are on market'
 
stop foolin

Congratulations, you've paid Seasonic for a piece of garbage.
As you said, without replacing the PSU (not with higher wattage one but better quality 550W+) you shouldn't consider AMD Vega but honestly i wouldn't consider Vega either way.

I'd go for the 1660 Super.
 
The Vega 56 will offer similar or sometimes slightly better performance, but it consumes almost twice the power. Also, it is quite old at this point and I wouldn't expect further driver updates to improve its performance by too much anymore, whereas the 1660 Super was just very recently released, so you could potentially see (very slight) performance improvements in the future.
 
Also, paying the extra for the 1660 Ti isn't worth it at all at this point, as the Super will almost always offer equivalent performance.