no I think the ultra or extreme test is for more then you got and can handle ???? I can run ultra or extreme but I know its not going to pass them on a single card and one or 2 1920 × 1080 monitor ?
Fire Strike Ultra
PC systems designed for 4K gaming
DirectX 11 feature level 11
3840 × 2160 (4K UHD)
Fire Strike Extreme
Multi-GPU systems and overclocked PCs
DirectX 11 feature level 11
2560 × 1440
Fire Strike
High-performance gaming PCs
DirectX 11 feature level 11
1920 × 1080
starts on page 125
http://s3.amazonaws.com/download-aws.futuremark.com/3DMark_Technical_Guide.pdf
''My PC had been running smoothly for over a year but recent performance fluctuates''
could be due to you installed the latest driver not all drivers are the same and just because its a new driver don't make it a better driver ? same os ?? maybe you went to win-10 ? maybe a windows update affected something ? with games like from steam and origin or uplay you accept and agreed to mandatory content , downloads or what ever they decide to do to your computer as they see fit ?? they could of made changes to your computer under your nose you agreed to that ''with out limitations'' [ I have nothing from them in any way on any of my computers , no way keep your games and content don't want or need them that bad]
so with just all that in mind you could change out hardware and in a week be right back where you are now ..
why not just run regular fire strike 'benchmark'' not stress test and post your scores
http://imgur.com/BLA7QfW
last time on a different driver I scored 13850 ?? so it can change with every run not like OMG my score dropped 200 points I need a new card or psu or southings wrong , just the way it is and taken with a grain of salt
in the end only you do whats best for you
then things as this ??
https://www.techpowerup.com/forums/threads/3dmark-stress-test-is-bugged-i-think.224109/