A used GPU that mined for a couple of years almost certainly has dried-out thermal paste on the die and tired, compressed thermal pads on the memory and VRMs. Refreshing them is the single most valuable thing you can do to a second-hand card before you trust it with 24/7 work. It is a calm, methodical job that anyone comfortable with a screwdriver can do.

What you will need

  • A quality non-conductive thermal paste
  • Replacement thermal pads in the correct thicknesses (often a mix of 1.0mm, 1.5mm, and 2.0mm)
  • A precision screwdriver set
  • Isopropyl alcohol (99 percent) and lint-free wipes
  • A clean, well-lit, static-safe surface

1. Photograph everything

Before you remove a single screw, take photos of the card from every angle. Note which screws came from where, since GPU coolers often use several different screw lengths. A magnetic mat or labelled cups keeps them organised.

2. Separate the cooler

Remove the backplate, then the shroud and heatsink. Disconnect the fan header gently. Lift the cooler straight up; if it resists, the old paste has glued it down, so warming the card briefly under load beforehand helps.

3. Note the old pad thicknesses

This is the step people skip and regret. Measure or note every existing pad thickness before removing it. Using the wrong thickness causes either no contact or cracked memory chips. When in doubt, match what was there.

4. Clean thoroughly

Wipe the GPU die and the cooler's contact plate with isopropyl alcohol until spotless. Remove every trace of old pad residue from the memory and VRM areas.

5. Apply new paste and pads

A small pea-sized dot of paste in the centre of the die is plenty; the cooler's pressure spreads it. Lay the new pads precisely over the memory and VRM contact zones, peeling both protective films.

6. Reassemble in a cross pattern

Tighten the cooler screws gradually in a cross or X pattern so pressure is even. Snug, not gorilla-tight.

7. Verify before you mine

  1. Boot and confirm the card is detected
  2. Run a short stress test
  3. Watch core and, crucially, memory junction temperatures
  4. A good repad often drops memory junction by 15 to 25C

A refreshed used card runs cooler, quieter, and far more reliably. It is the best two hours you will spend on a mining build.