If you bought this card in full GPU crisis than the price is "understandable".
I'm sorry man, I feel for you.
As other said that heatsink is too small, I would say is for AMD Sempron from 2001.
Cap your card to 60 FPS in NCP(capping FPS will reduce power draw therefore the heat) till you work out something, VRAM can fry. When GPU is 90 C VRAM prolly is 105 or 110 C which is critical.
Increase to maximum RPM of your rear exhaust fan is the closest to your GPU.
Your options are :
1. Try this
92 mm fan
in pull, however I will try 2x 92mm in your case. 120mm is worst. Make sure the fan you buy got rubber mountings - some of the Arctic and some of the Noctua will come with rubber mountings maybe other brands to. Create a bigger gap with the rubber mountings, you'll benefit of a bigger gap, in the video is too small and in your case rotor of the fan will get too hot. This mod works even if you don't have a backplate on your card.
2. Craft a backplate out of aluminum or copper > 2 -3 mm thickness just sit it on your back of your card with a lot of thermal putty in between, like this
UTP 8 putty is cheaper and good enough you need about 30-40 grams of it. - Aliexepress - store Middle999 shipping it will take like 3-4 weeks as it comes from CHN. Don't get K5 putty or anything from CSGR store.
Don't use copper shims if you don't know what you doing. Kapton tape is not for your card.
If no Aluminum or Copper available a cut of a bathroom tile, slimmer you can find, be aware of the weight, you'll need to work out an anti sagging support, ceramic tile are heavy you need it(crayons cut to size with rubber washers, just an example) even though you need thermal putty or 2 mm thickness thermal pads to transfer the heat form PCB to the tile fast enough.
3. Sell it and get a 1070, 1080 with at least 2x fans.
Hope it helps
