[SOLVED] New GPU, old MoBo. Will it work fine?

[Omnigash]

Tought about upgrading my GTX 950 (which works fine up to this day) and recently bought a RX 580 8Gb Asrock, but the rest of my build is ancient (will upgrade soon). My concern is if the new GPU will work fine or I'll have performance issues.

My Rig:
Windows 10 Pro x64
8Gb RAM DDR2 800Mhz
Core 2 Quad Q6600 OCed to 3.0Ghz
2 SSDs, 480Gb and 240Gb
PSU: Seasonic S12i 620w
MoBo: ASUS P5KSE (with a modded bios to enable AHCI).

Asking cause I saw somewhere that may occur some issues with new GPU and Legacy bios, but I'm not an expert in the matter.

Thanks in advance.

 

[william p]

I see that GPU and MB running together here.
https://www.userbenchmark.com/System/Asus-P5K-SE/3520
I'm also seeing a lot more potent CPU setups on that MB.