so I recently got this DELL OEM RX580 card "See discussion HERE" I I had read that this card was Modded by Dell to operate on reduced power as to reduce the chance of problems and RMA requests. Most of the information I cam across led me to believe that it was a 160watt card so I was still very concerned about it. I had in it in my MacPro 5,1 but I didn't want to really push it until I was sure about the power usage as I had already blown a board because of this before. I put the card in a windows Machine and pulled up the Bios Editor and low and behold what did I see? Can this be??? and RX580 that uses 110 Watt max??? ok so now I know it is safe. So I decided to put it back in the MacPro and then do some benchmarks. I thought well if it is running on reduced power this probably means reduced performance right? Well, as it turns out not exactly! Ok before we get started in OSX this card is shown as a Radeon RX480 8GB. from everything I have read this has something to do with the Device ID of the cards being the same. this is a known thing. Annoying but known. If anyone knows how to correct this and make it show RX580 I would love to know how. so if you look in the Geekbench browser and lookup the the score you will find: A standard RX580 Series score is: 128239 and the DELL Reduced power RX580 card: 131408 Very interesting. But perhaps an anomaly. So let's try something else. LuxMark Perhaps. I found a few MacPro RX580 Luxmark scores online and average was about 12611 the DELL Reduced Power RX580 card score: 14047!!! What is going on here? does reducing the power perhaps slow the car speed? I know that in a lot of the benchmarks I saw the typical RX580 reports GPU, 36, 1380 MHz the Dell reduced power card card reports GPU, 36, 300MHz! that is a very drastic reduction. But somehow it has resulted in a higher score on the benchmark! so what about FPS in 3D applications I found a reference for Engine Heaven where the STANDARD RX580 shows as R9 XXX (8192MB) and produces a FPS of 55.8 and a score of 1406 min 11.4 and a max 97.4 in Windowed 1080p with 2xAA and Tessellation disabled. I don't know what the desktop resolution was for this My desktop resolution is 4K So the Dell Low Powered RX580 shows up as Radeon RX480 (256MB) wtf???? but anyway in Windowed 1080p with 2xAA and Tessellation disabled mode I get : FPS: 55.6 Score: 1400 Min: 10.8 Max: 99.2 Very interesting. Almost identical for a lot less power draw! and it gets better! if I put it into fullscreen mode the score Jumps up! FPS: 62.6 Score: 1577 Min: 27.0 Max: 117.3 BTW I got the card for $180 and free shipping on eBay!