I got the BIOS issue sorted and ran some tests. These are the power stress test on OCCT and make my computers cry, maxing the system across the board for power consumption.   In this machine I have a 1620 v2, stock clock pulling ~80W under max load. With a 2080 overclocked I was able to pull a stable 235W. The 2080 Super and 2080TI I was testing with crashed the system in short order @ full load (likely 300W+ on the card). I LOVE the Sapphire RX580 Nitro+, its an excellent card with a great VRM design. I gave mine to a good friend to help him start a build and it is treating him well still. I would say absolutely go for it, in gaming you shouldnt be anywhere near the power draw as in the stress test. If youre OCing the card, I suggest using Sapphire Trixx, the program allows the highest power limit and core voltage increase slider adjustments compared to my personal favorite tool, MSI Afterburner - plus IIRC, Trixx allows some pretty nice LED adjustment on the card logo.   Your T3610 w/ RX580 Nitro+ should be able to handle most anything you throw at it without much difficulty [NAME].  
Hi I'm planning to upgrade the GPU on my T3610 to a Sapphire Nitro+ Radeon RX 580 8GB. Sapphire says the card's power consumption is <235W. It needs a 6 pin and an 8 pin auxiliary power. So, can I actually run this card in my T3610, the PSU has enough power I think (685W), but the connectors are a problem. The PSU board has an 8 pin port, with an 8 pin to two 6 pin connectors cable plugged in. (a bit of an odd cable really, two of the pins on the 8 pin end aren't actually used). As we all know the PCIe slot the card is in gives 75W to the card. My concern is that if I replace this cable with an 8 pin to 8 + 6 pin cable, the cables will have to manage 235W-75W=160W going through them. (The -75W is from the PCIe slot where the card sits). 8 pin connectors are usually made for 150W, and 6 pin connectors for 75W. Can the 8 pin port on the PSU board really handle 160W? The Dell T3610 spefications sheet says the system can handle a dual setup with maximum 300W total, but I always imagined 150W are from the two PCIe slots the cards are in, and the remaining 150W are from that 8 pin port on the PSU board. Is this wrong? Can that port handle more than 150W? Also is there an order to which port the card draws power from? Does it prioritize auxiliary power before PCIe slot power, and thus might try to draw 235W through the 8 pin on the PSU board?
T3610 GPU upgrade 235 Watts