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AMD K7 Athlon
While debug port usage of K7 (slot version) deals mainly with GFD's (Golden Finger Devices) this method modifies resistors on the K7 PCB. So you'll have to open the CPU package to get these modifications running.
R155 / 156 / 157 / 158 frequency selection (BP FID)
R121 / 122 / 123 / 3 frequency selection (core FID)
R4 / 5 / 6 / 124 frequency selection (BP FID)
R148 / 150 / 151 / 153 voltage selection (VID)
0 no resistor / 1 resistor 101 (1kOhm) / 2 resistor 102 (100Ohm)
| MHz | R155 | R156 | R157 | R158 | R121 | R122 | R123 | R3 | R124 | R4 | R5 | R6 |
| 500 | 1 | 0 | 1 | 1 | 0 | 1 | 0 | 0 | 1 | 1 | 0 | 1 |
| 550 | 1 | 0 | 1 | 0 | 0 | 1 | 0 | 1 | 0 | 1 | 0 | 1 |
| 600 | 1 | 0 | 0 | 1 | 1 | 1 | 0 | 0 | 1 | 1 | 0 | 0 |
| 650 | 1 | 0 | 0 | 0 | 1 | 1 | 0 | 1 | 0 | 1 | 0 | 0 |
| 700 | 0 | 1 | 1 | 1 | 0 | 0 | 1 | 0 | 1 | 0 | 1 | 1 |
| 750 | 0 | 1 | 1 | 0 | 0 | 0 | 1 | 1 | 0 | 0 | 1 | 1 |
| 800 | 0 | 1 | 0 | 1 | 1 | 0 | 1 | 0 | 1 | 0 | 1 | 0 |
| 850 | 0 | 1 | 0 | 0 | 1 | 0 | 1 | 1 | 0 | 0 | 1 | 0 |
| 900 | 0 | 0 | 1 | 1 | 0 | 1 | 1 | 0 | 1 | 0 | 0 | 1 |
| 950 | 0 | 0 | 1 | 0 | 0 | 1 | 1 | 1 | 0 | 0 | 0 | 1 |
| 1000 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 0 | 1 | 0 | 0 | 0 |
| 1050 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 |
| Vcc core | R148 | R150 | R151 | R153 |
| 1.30V | 0 | 0 | 0 | 0 |
| 1.35V | 2 | 0 | 0 | 0 |
| 1.40V | 0 | 2 | 0 | 0 |
| 1.45V | 2 | 2 | 0 | 0 |
| 1.50V | 0 | 0 | 2 | 0 |
| 1.55V | 2 | 0 | 2 | 0 |
| 1.60V | 0 | 2 | 2 | 0 |
| 1.65V | 2 | 2 | 2 | 0 |
| 1.70V | 0 | 0 | 0 | 2 |
| 1.75V | 2 | 0 | 0 | 2 |
| 1.80V | 0 | 2 | 0 | 2 |
| 1.85V | 2 | 2 | 0 | 2 |
| 1.90V | 0 | 0 | 2 | 2 |
| 1.95V | 2 | 0 | 2 | 2 |
| 2.00V | 0 | 2 | 2 | 2 |
| 2.05V | 2 | 2 | 2 | 2 |
| L2 Cache | ||||||
| Ratio | R101 | R102 | R103 | R104 | R106 | R107 |
| 1/2 | 1 | 0 | 0 | 1 | 1 | 0 |
| 1/3 | 1 | 0 | 1 | 0 | 0 | 1 |
| ? | 0 | 1 | 0 | 1 | 1 | 0 |
| ? | 0 | 1 | 1 | 0 | 0 | 1 |