Do you leave Fast Boot off after you have flashed? Or do you turn it back on after you have updated BIOS? And is there more benefit to using ReBAR? I updated the default 3080 FTW3 Hybrid. Can I enable ReBAR now on the X1 page?
It's up to you whether to use Fast Boot or not. The main reason you want to turn it off is when you are making changes to your system or card that needs to be updated in Windows. Windows will update software information when there's a major change (like going from a 3080 to 3090), but Fast Boot will ignore minor changes (like an MCU or BIOS update). Here's a short primer when to have it on or off: When to have Fast Boot OFF
When it's OK to have Fast Boot ON
- When running Precision X1 for the first time after installing a new card or after flashing the BIOS
- Before you change from one 3080 to a different 3080
- Changing a 3080 XC3 to a 3080 FTW3, for example
- Changing cards after an RMA if it's the same GPU. Why?
- Because you sent us an XC3 card and we replaced it with an XC3 ULTRA card
- Because the MCU version might be different than your previous card
- Because you had a different switch enabled on the card you sent back to us for RMA
- Because you had a different BIOS version flashed to the card you sent back to us for RMA (e.g. FTW3 HYBRID on a non-HYBRID FTW3 card)
- When flashing a new BIOS
- When flashing a BIOS from one type of card to another (e.g. FTW3 to FTW3 HYBRID)
- When switching an FTW3 card or KPE card from one BIOS chip to a different chip (e.g. Normal -> OC)
- Depending on who you ask, never....But I digress....
- After rebooting (just to be safe) a second time after changing from one GPU to a different GPU - e.g. 3080 to 3090
- After rebooting (just to be safe) a second time after flashing your BIOS
- After rebooting (just to be safe) a second time after changing the BIOS switch on your FTW3 or KPE card
- But mostly, once you're sure that you've done trying out different BIOS versions and you've updated each BIOS chip on your card for a while
Basically, you can probably see a theme here. If there's a chance that Windows might ignore a software update to your BIOS or MCU, then it's best to have Fast Boot off. Otherwise, you can leave it on.
Regarding Resizable BAR, I'll leave the debate to others about the benefits of it right now. However, once you've updated your BIOS to the FTW3, you should be able to use the Resizable BAR update download in PX1. Please observe the PSA's that we have about making sure to disable CSM first, however.