I edited the other post with some pics. (Nevermind the pics, googled the gpu and its the same everywhere)
I still get roughly 400 MB/s when bandwidth testing..
A resume of when and how my issue started:
My pc entered normal sleep mode( this sometimes happened but with 0 issues, just like a normal pc ), then when I tried to wake it, it did wake, fans started etc, but monitor was black-screen with the power-light flashing. So, I decided to restart my computer from the button. A normal restart went through, heard my Windows Welcome Sound etc. But monitor still the same, black-screen and power-light flashing. Tried everything to get it work, searched the same issues online, tried to work it out, I didn't know what was going on.
So I opened my pc case and replugged the PCI-E cable to the gpu, and voila it worked normally. But from then I drastically saw fps drops in some of my games. Some games just straight low fps, others normal fps but with stutters.
(In case you know of any of these games: CS:GO - can play only with r_dynamic 0, if its 1, it enables some extra flashing on the guns and on the map, when people spray/shoot/flashbang, fps drops to 50 from 300-400, and causes some constant stutter while guns are being sprayed) -
(Rocket League: it seems very stuttery even tho fps is high) - these are some examples.
And now after I removed the graphics card and put it back (ofc removed all cables etc), monitor was black-screen again with the light flashing, I replugged the PCI-E cable, and it worked once again... very weird stuff.. no clue what's making this happen.
(One more example of this issue: I uninstalled nvidia graphics driver and the screen went black with the same issue, replugged PCI-E, worked etc.)
Edit: It seems I scored a normal score to all the others 750 TI's (1600x900 res) (1141 - Extreme HD/Ultra, Valley), all the above issues still stand though... not sure what to think..
TLDR: Performance dropped (random fps drops) in games after a random black-screen occurred, gpu bandwidth runs at x1 v2.0 instead of x16 v2.0, even when tested. Benchmark seems Ok(normal results). I need help on making my gpu run at x16 v2.0 speed again..
Even the bandwidth test still shows the same result ( I should be getting x16 these speeds, but I'm not..):