P750GM PSU is 80 Plus Gold Certified, the other two are 80 Plus Bronze Certified
Gigabyte has introduced three compact power supplies. The 750W P750GM is 80 Plus Gold certified and fully modular, while the 550W and 450W P550B and P450B are 80 Plus Bronze certified and rigidly secured cables. In all cases, the PSU is 14 cm long, and a 120 mm hydraulic bearing fan is used to cool the components.
Model P750GM includes a 24-pin motherboard power cable, two 8-pin (4 + 4) processor power cables each, two additional PCIe power cables with two 8-pin (6 + 2) connectors each, and two cables SATA power supply (four connectors each) and a cable with three Molex connectors and a drive connector. The fan in this PSU does not rotate if the consumption does not exceed 20%.
Comparing cables only, the P450B and P550B differ from the P750GM in that they have a single 8-pin processor power cable (4 + 4) and a 6-pin SATA cable.
All three power supplies are built according to the scheme with one 12V bus and are endowed with protection against overload, short circuit and other abnormal conditions. The source does not provide prices