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Not intending to sound like a jerk, just a bit perplexed, and want to help.
You pulled a working card that came with the system, and replaced it with an older card that is giving you trouble? I'm confused as to why this is Dell's fault.
You also state you have a reason to do it, but dont state the reason. It is very difficult to help if you dont explain why such a drastic move is needed.
Ok so here is the reason. I need to use the Display port on the video card. Dells website says the r9 has the DP port. Every GTX 1650 card out there comes with HDMI and DP. However the one in my R9 DOES NOT have a DP port but instead a DVI! So yes, Dell is partially to blame, even though im not blaming them for my issue really.
Yes the R9 has an onboard DP port, but that is disabled as long as theres video card in the system.
My GTX 950 has 1 hdmi and 3DP ports. I am just trying to use that card in the R9 and the question is why it doesnt work, whereas that card works in every other PC i have. I cannot find anything anywhere that specfically states if this is realated to UEFI, Secure boot or the GTX950 not support UEFI(which supposedly it does, as do Nvidia cards as of series 5-6).
So my issue remains unfortunately.
Thats really weird about the card having no DP. Are you sure? What did Dell say?
Also, do you have a 120hz monitor? is that why you are trying to use the DP, for gaming? If not, just put the original card back in, and use HDMI. Also, I think you have a one step forward,two steps back situation. If you get the card with DP working, and have a 120hz monitor, that cards performance is going to struggle with some of the more modern games like Metro and others at high settings.
Dells website says the r9 has the DP port. Every GTX 1650 card out there comes with HDMI and DP. However the one in my R9 DOES NOT have a DP port but instead a DVI! So yes, Dell is partially to blame, even though im not blaming them for my issue really.
Just went over to configure an R9 to see the port options and there's a "*" disclaimer saying IO availability depends on selection of graphics card.
Can you use a hdmi-to-dp adapter?
I'm no expert on the adapter, but I would assume this allows connectivity, but wont be able to convert HDMI to 120hz?
We are missing some info here, and it would be nice to know if the OP has a 120hz monitor. If not, then this is a case of spinning his wheels, and he can put back the original card and go HDMI.
i already tried that doesnt work.
ok so to add more to the confusion. when i first installed the 950 in the pc like 3 days ago, had same problem. After after some fiddling, not sure what i did, but it started working. The secure boot was on at that point.
1. Honestly, I still stand by my original opinion... I really think this is an issue on the GPU firmware even if you were able to get it to post using secureboot on a couple occasions. This is a pretty common issue believe it or not. Many people on this forum, myself included, have installed non-Dell GPUs in the Aurora's z370 board. But those maxwell GPUs predated both DP 1.4 and 1.3 so I would expect this issue even. You can plug the GPU into your old system and update the GPU vbios here, then you can try plugging it in again in the Aurora R9 (should take you like 5 minutes): https://www.nvidia.com/content/DriverDownload-March2009/confirmation.php?url=/Windows/uefi/firmware/... Alternatively, if you no longer have your old system, you can try booting using an hdmi cable instead of a DP cable.
2. If the above doesn't work, I just looked at your photo and noticed the retail tag on one RAM stick. Did you recently upgrade your RAM using retail Kingston HyperX fury??? Because the Dell Hyperx fury is custom spec'ed for Dell and has different timings and requires a higher voltage to maintain stability over the comparable retail RAM. You usually can't mix them without encountering issues. So the other thing to do would be to remove any retail RAM, clear CMOS, and reboot using only the OEM RAM to rule out a RAM issue.
3. If it were me, I would just return and rebuy a system with a higher GPU that includes DP outputs. I wouldn't want to go that far backwards in tech. I'm am surprised Dell's didn't include a GPU with at least 1 DP in a gaming PC.
Reading @r72019's reply just made me remember that one time he had this Titan card that works as a secondary card but not for boot. Now you can do the same for your system. Plug the 1650 in PCIe slot 1 and the 950 into the other slot. Boot up the computer and see if the system recognizes the 950. If it's a case of works-as-slave-not-as-master, then we have another path to debug this and look for solution.