firepro 5100 will only display 1280x800 with dell 30" monitor. I have latest video drivers and also have a dual link DVI cable
You need to provide more details on precisely how the monitor is connected (which port, what adapters, etc.).
It is connected on the very top display port, using the display port to DVI adapter that it came with.
Passive adapters like that only allow DisplayPort Dual Mode functionality, which is when the DP controller acts as a DVI/HDMI connection. There aren't enough pins on a DP connection for a second DVI link, so you are limited to normal DVI capabilities.
The Dual Mode functionality in DisplayPort 1.1 and up does include support for HDMI 1.3/1.4, which runs at a higher frequency than standard DVI, and therefore allows higher throughput on the same number of pins. As far as I can tell, Dell 3008 and later models have HDMI 1.3+ ports, so a passive DisplayPort to HDMI adapter (including DP to DVI, then DVI to HDMI) should work.
Given that your resolution dropped to 1280x800, not 1920x1200, I'm guessing you have the 3007 model which has no scaler, and only supports Dual Link DVI input. If so, you need an active adapter such as this.
That makes sense. Thank you so much for the advice and information you have given me. I will look for one of those adapters.
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