Following the above (as I reported on another thread), I unsuccessfully attempted to install a new RX 460 graphics card in place of my Radeon HD 6750; it doesn't have a 6-pin connector, so MAY be trying to draw too much power (although it's said to be max 75w) from the PCI-E Gen.2 slot. So I returned it and bought another (also returnable!), which DID have a 6-pin connector: a used Radeon R7 260X - but with the same result. Just a small on-screen message saying 'No video source identified', while the card's fan began to spin - using either HDMI or DP connection. This card is said to require 115w, so should have been comfortably covered (75+75=150). I'm about to return that one and next perhaps try a used Radeon RX 550, which amazingly only seems to need 50w (but doesn't have a 6-pin connector). Turning to your questions: I would sooner not have to change my PSU as I have only recently replaced it, after the fan sounded as though it was about to fail! My new monitor is specified here: https://www.benq.com/en/monitor/designer/pd2700q/specifications.html As to the streaming service requirements, it is just BBC iPlayer in HD form (I can't find any details). But really ALL I want is a card which will comfortably output 2560 x 1440 to a 32 inch screen (with NO gaming requirement). If the problem is NOT inadequate power supply to the cards, could it be the 8-year old BIOS - AMI v4.6.4 (04/03/2011) [the BIOS itself calls it EM0304 03/04/2011)]? Through another post on this forum, I've found what is said to be the only version available (M1_0619.ROM) - although there seems some uncertainty as to whether this is actually for my ECS H67H2-EM v1.0, rather than other suffixes. Unfortunately this particular (EM) mobo version very rarely appears in web-searches (even on ECS's site), presumably as it is unique to Medion, and intelligent BIOS tools (such as ECS's own) do not work with it. Medion itself doesn't seem to offer anything. Having read so many warnings about the serious consequences of wrongly updating BIOS settings, I am VERY cautious about attempting it (for the first time) unless it is absolutely necessary. I hope this information (along with my thoughts) is sufficient to lead you to be able to confidently advise on GPU compatibility ASAP. [Unfortunately even the useful-looking on-line compatibility-checkers that I've recently discovered aren't of any help - again because of the unique Medion mobo spec!] Thanks for your input.
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