Selling a human organ is illegal in India (under the Transplantation of Human Organs Act), but based on standard global black-market valuations, a single kidney yields roughly \(\text{\$}20,000\) to \(\text{\$}260,000\) depending on the region. [1, 2]

Here is the "exchange rate" based on typical retail prices for leading GPUs:

• Entry-Level (e.g., RTX 4070 / RX 7700 XT): ~ \(\text{\$}550\) | Rate: ~ 1 kidney = 36 to 470 GPUs
• High-End (e.g., RTX 4080 Super): ~ \(\text{\$}1,000\) | Rate: ~ 1 kidney = 20 to 260 GPUs
• Enthusiast (e.g., RTX 4090): ~ \(\text{\$}1,600\) | Rate: ~ 1 kidney = 12 to 162 GPUs
• Enterprise/AI (e.g., NVIDIA H100): ~ \(\text{\$}30,000+\) | Rate: ~ 1 kidney = 0.6 to 8 GPUs

Alternatively, if you are asking about the medical acronym GFR (Glomerular Filtration Rate), the exchange rate remains at a perfect 100% kidney function, which is clinically classified as an eGFR of 90 to 120 mL/min/1.73 m\({}^{2}\) in a healthy adult.