RTX 3090 repaste guide fixes throttling

The value here is less “how to open a GPU” and more “proof that a beat-up 3090 can still be a strong local inference card if the thermals are restored.”

• –The before/after numbers are the real hook: hot spot temperature dropped sharply, clocks rose, and fan noise fell once the paste was replaced
• –It reinforces a practical truth for local LLM builders: used 3090s are often a better value than newer cards if you are willing to do basic maintenance
• –The guide is concrete, not hand-wavy, because it includes photos, tool notes, and sensor data rather than just a repaste anecdote
• –The memory junction increase is not a regression; the card was simply no longer throttling, so the VRAM was finally seeing full-load behavior
• –This is especially useful for builders shopping the secondary market, where a “broken” 3090 may just need service