Upgrading GPU with a 550W PSU. Any recommendations/advice?

[FormatAbuser]

So as i said in the title I'm about to do an upgrade on my PC but i only have an XFX XTR 550w Gold PSU (Was "Tier A" when i bought it like 4-5 Years ago not sure about now).

 

Current specs are listed here (CPU-Z: https://valid.x86.fr/lh33b9) but in summary i have Undervolted and Overclocked the following parts. CPU(5600X) GPU(1070TI EVGA Ultra Silent FTW) RAM(2x8GB Trident Z DDR4 3600MHz cl18) 

If you need more details just let me know.

 

So question is should i buy first a GPU(Probably Used one) and after 2-3 months a PSU or the other way around? I'm thinking about buying a 3070/ti/super (Which ever is around 300euro at the time)

I've checked on PSU Calculator and all my parts(Overclocked) with a 3070 at 100% TDP is around 450W which means i have a headroom of 100W. 

 

Preferably i would like the GPU first but i can get the PSU and wait 1-2 months if that makes things right. Is it too much for my PSU to handle? Should I undo all the overclock and keep the undervolt in order to have more headroom if i get the GPU first? If you have any other GPU in mind feel free to let me know.

[leclod]

I'd just buy the gpu, undervolt it and save 1/4 power.

Forget about overclocking which is very bad powerwise while not very good performancewise.

And you should be fine as long as you've got sufficient airflow.

 

 

Edited February 11 by leclod