I got the HP Pavilion 690-003bla about a year ago, I want to upgrade the GPU to a GTX 1660, however, my current PSU (180 W (Gold)) cant handle it, doesnt have enough power and lacks the 6/8 pin connector.
The problem is that the PSU is plugged in to a weird proprietary motherboard (sunflower https://support.hp.com/lamerica_nsc_cnt_amer-es/document/c06026205) via 4 pin connector and I havent been able to find a PSU that uses a 4 pin connector instead of the 24 pin regular connector. I checked at my local pc part retailer and they recommended me to buy a regular PSU and use the regular 4 pin connector that comes with it and to plug it in to my motherboard. I cant find information on whats the voltage and amperage that the motherboard takes from that 4 pin connector of my current psu and if thats the same power in the 4 pin connector in this PSU https://www.amazon.com/EVGA-Certified-100-W1-0600-K1-Fuente-alimentaci%c3%b3n/dp/B0160XJAQK?language=en_US
Im sorry for the broken english, not my first language but I didnt get any luck searching for this in spanish.
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Unfortunately proprietary PSUs is one of the annoying things about OEMs. As far as I know there are no off the shelf PSUs that are compatible with these odd ball ATX power configurations. The 4-pin on that EVGA power supply is called the EPS or commonly referred to as CPU power. It's actually an 8-pin connector split into two as lower end boards will use only 4 pins for CPU power and higher end ones gaming/workstation ones would typically use both 4 pins.
You might be able to find an adapter that goes from ATX 24 to the standard HP uses for ATX power (not CPU power), but where to find one I'm not 100% sure. Also not certain if the 4-pin ATX HP uses is just the extra 4-pins that split away from 24 ATX for backwards compatibility with the old 20 pin standard.