The best replacement for 20 pin is 24 pin power supply.

The best alternatives to 20 pin are rated as following:
★★★★★  24 pin power supply
★★★★  24 pin
★★★  24 pin motherboard
★★  24 pin atx
★  24 pin atx power supply
★  20 4 pin
★  20+4 pin
  atx 24 pin

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Speaking about 20 pin, one probably shouldn't forget about 24 pin.

Other search terms related to 20 pin and their ratings are:
★★★★★ 24 pin
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