Mac pro turns slow, interface doesn't work properly grafic errors

[bvega]

Just take a spare drive and do a clean install of OSX on it. Don't wipe the drive you're using. At least this will test for driver or software related issues. I suspect what tsialex is saying regarding a dying card, but at least a fresh start will tell you 100% for sure.

Did you clean and reapply thermal paste on the GPU?

Yeah, i changed the thermal past.
Now I will install the operating system again on another disk and test the GPU from there.
I am currently using the original GPU and everything works fine, apparently my GTX 660 is dying

 

[bsbeamer]

If you reapplied thermal paste to the GPU, there’s a chance you damaged it or was already damaged beforehand.

 

[Alex Sanders74]

The OS reinstall will tell the true story... Sorry your GPU is potentially toast. The good thing here is you have an opportunity to replace it with something more powerful.

 

[bvega]

The OS reinstall will tell the true story... Sorry your GPU is potentially toast. The good thing here is you have an opportunity to replace it with something more powerful.

Yeah, its done.. now i have a MSI GTX 960 but i need another cables

Do you know if this cable will work ?? (Final question of this thread)

https://www.amazon.com/dp/B07J336WY4/ref=cm_sw_r_cp_api_i_.iLPCbS17RVBS

Thank u guys !

 

[bsbeamer]

This model?
https://us.msi.com/Graphics-card/GTX-960-GAMING-2G/Specification

If so, it's single 8-pin. That Dual Mini 6 Pin to 8 Pin cable you linked should be fine.

Just making sure you know, GTX 960 will not work with Mojave. You need NVIDIA Web Drivers. Stick with High Sierra at most.

 

[Alex Sanders74]

That will be quite a bit faster than your 660 was. As bsbeamer said, that cable will work if your gpu pinout is the same as he mentioned. Enjoy the new card!