MSI Z68a-g43 B2 post recomendation please

Hello,
as many others i also have B2 post problem after putting nvidia 650ti into PC
I realize its hybrid bios issue,and it requires updating bios to latest with GOP support.
BUT
There is a lot of complains about not being able to overclock intel 2500k after updating bios to 5.xx
As clearly my cpu is not Ivy ,but Sandy.And i need OC.
So,What is best solution here?
update to 5.2 bios and fix b2 post problem with eventual problem of not being able to overclock?
Does problem happens on all newer cards?Can OC be rectified?
Please Advise.
Thank you

Its G3
and i have chieftec 850W Nitro PSU
2xExcelleram Black Shark dual kit XMP there is no error on memory stress test of any kind
Now i am perfectly aware about what's causing the issue,and none of above is the cause
using E7750IMS.443 (clearly not 2.1 UEFI) so without GOP support mentioned below.
https://forum-en.msi.com/index.php?topic=155508.0
MSI Press Release info:
https://forum-en.msi.com/index.php?topic=162345.0
The NO POST (in fact, a hang on POST code B2) is caused by the Hybrid BIOS in the VGA card that has conflict/compatibility issue with older UEFI BIOS without GOP support.
GOP support has been introduced with UEFI 2.1 and is required by SecureBoot, thus Win8 compliance (not required by end users).
Now back to original question..
I also readed that people are heaving problems with OC-ing 2500k after updating to 5.2 bios.I cannot let that happen.
I will rather return gpu and choose another one if there are some range which are not affected.
because MSI states its for 660-670 x cards
While clearly i am trying to use 650 card
and other have had same problem with 780 nvidia..
So ..what to do?
How to choose gpu ,OR avoid problem with OC with 5.2 bios?
Board has no problems with older gpu's tested with 560ti and ati 4870
EDIT
I run into discussion about same OC issue with 5.2 bios
https://forum-en.msi.com/index.php?topic=167075.0
It seems that there is no definitive answer...
Trial and error ..
I cannot accept that,i need OC and i need working gpu..
upgrade to ivy is not an option...
what to do..

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