saibalroop

Mine is working on the cpu, but not GPU now...

Fresh install always better. 

I'd reinstall to be safe.  At best, Windows will ask to be reactivated.  At worst, your drive is trying to load up a lot of old motherboard and chipset drivers and crashing.
 
 

You should reinstall to avoid any weird conflicts with old drivers and such

i think you'll be good with just putting the ssd in the new pc

Very good price be sure that the bios for the gpu is not mining bios. Make the seller flash the bios or do it by yourself. 
 

Will you get FreeSync? that's the main different between the GTX 1070 and GTX 980 Ti nowadays... both perform on pair with each other... the 980 Ti will be ever so slightly better at a considerable higher power draw but ultimately the main differential is how Pascal has Freesync support while Maxwell does not.

GTX 980ti and GTX 1070 trade blows. Overclocked 980ti was usualy able to just barely outperform overclocked GTX 1070 but it really comes down to what games you play.
Both of them significantly outclass the RX580.

If you're spending up in the neighborhood of $230 you might consider a used Vega56. I've seen them go as cheap as $240 and it will outperform all of these cards. Out of these, I wouldn't recommend the 580 due to performance and I wouldn't recommend the 980Ti due to age. 1070 or Vega56 imo

Ok. I think it was a bad sensor b
 
Ok Thanks my sensor is probably bad. 
 
 

i have a hyper t2 and its pretty quiet and underload i stay between 50-60c
 

I don't even think it has a value..... but i saw one brand new for ~$30

uh I mean i'd probably accept £40 for the burden of taking it off of your hands.

The stock cooler is plenty for cooling and you should experience how it sounds before deciding on whether or not to replace it.
If you get an i5 or i7, it should come with a better cooler with a copper core.

My mother's PC has a g4400 and has the stock cooler and I swear it is the quietest PC I have ever seen, it is dead silent with a 200mm front intake and a 120mm exhaust 

OK. Sorry I didnt see the TDP of the system. 

Be Quiet Pure Rock Slim is about $20 for pure silence. 

Why not