I picked up an FX 9590 to replace my 8350 but it won't boot even into BIOS on my sabertooth r2.0 with latest bios
It works with my CHVZ though, any workarounds to get it work on the saber?
That motherboard doesn't support the 9590 because the wattage required to push that CPU is too high for it. Take a gander over at SABERTOOTH 990FX CPU Support| Motherboards | ASUS Global for the CPU support list.
The 9590 is a 220w CPU where the 8350 is 125w.
The Crosshair board supports 220w CPUs as stated here :
There is no work around, that CPU is far too power hungry and the power distribution is too weak to handle that much wattage.
Probably for the best. If its posting on the crosshair and not the sabertooth it's probably the board itself. If you have a tester CPU I'd toss that in there. If the board overvolts and blows up that CPU then Asus may help replace the 9590. I've had this happen on an Asus board before. It's extremely rare but sometimes these 990 FX boards will kick the voltage up to get things moving and pop the processor. I have a few 8xxx series CPUs that are dead from this.