Z690 Taichi - CSM question (legacy BIOS)

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   Greetings
I have a Z390 Taichi with RTX 2060 i59600K.  I boot off a fully encrypted 2tb WD caviar black which is on the fly encryption.  For this to work, I need CSM (compatibility support module) enabled and legacy MBR boot.  It works perfectly and has done since I set up the rig in 2018.

I'm now going to upgrade to Z690 Taichi i712600K booting off the same MBR fully encrypted OTFE Caviar Black 2TB.  I'm also going to upgrade the RTX2060 to a RTX3070Ti.

It's an expensive proposition so I need to make sure the rig will work.  I've looked at the manual for the Z690 and it has the CSM which therefore should work in MBR/legacy boot mode. It does say I need a GPU which has legacy vbios but I'm using a 2060 now and that works, so stepping up to a 3070ti should work also.

Questions.  Is there any danger here that CSM on the Z690 won't work as does the module on my existing Z390?  Also, will the 3070ti also have legacy capability - ie vbios as this is necessary for the CSM to work?  

ANyone know the answers before I outlay several thousand $$$ on the rig?  I want to stay with Taichi as my current 390 is seriously stable and I have had Asrock since they started out over a decade ago.

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thang Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 03 Aug 2017 Status: Offline Points: 76	Post Options Post Reply Quote thang Report Post Thanks(0) Quote Reply Topic: Z690 Taichi - CSM question (legacy BIOS) Posted: 27 May 2022 at 12:21pm
	Greetings I have a Z390 Taichi with RTX 2060 i59600K. I boot off a fully encrypted 2tb WD caviar black which is on the fly encryption. For this to work, I need CSM (compatibility support module) enabled and legacy MBR boot. It works perfectly and has done since I set up the rig in 2018. I'm now going to upgrade to Z690 Taichi i712600K booting off the same MBR fully encrypted OTFE Caviar Black 2TB. I'm also going to upgrade the RTX2060 to a RTX3070Ti. It's an expensive proposition so I need to make sure the rig will work. I've looked at the manual for the Z690 and it has the CSM which therefore should work in MBR/legacy boot mode. It does say I need a GPU which has legacy vbios but I'm using a 2060 now and that works, so stepping up to a 3070ti should work also. Questions. Is there any danger here that CSM on the Z690 won't work as does the module on my existing Z390? Also, will the 3070ti also have legacy capability - ie vbios as this is necessary for the CSM to work? ANyone know the answers before I outlay several thousand $$$ on the rig? I want to stay with Taichi as my current 390 is seriously stable and I have had Asrock since they started out over a decade ago.

threadzipper1957 Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 05 Mar 2022 Status: Offline Points: 9335	Post Options Post Reply Quote threadzipper1957 Report Post Thanks(0) Quote Reply Posted: 13 Jul 2022 at 9:05pm
	Dear Thang, Intel (and also AMD) on the new chipsets, do not support legacy mode anymore. So CSM should be default set to disabled. When you set it to enabled, and set the Launch Storage OpROM Policy to legacy, it might work. But decrypt the drive, before putting it in the new system.
	Kind Regards