What is the make and model of the PSU in your build? Looking up the motherboard on Google image search, it looks like an HP prebuilt's motherboard, what is the model/SKU to your HP prebuilt? Apart from the PSU, you might run into clearance issues with a small form factor chassis.
I wouldn't go above a GTX750Ti but you should keep in mind that if your motherboard does not have UEFI BIOS, then any discrete GPU with a UEFI VBIOS will most likely give you a black screen in spite of booting into the OS GUI.
I see!
My PC specifications:
HP Pavilion P7-1080LA, I think is the one you found
SKU: QN686AA
PSU 300W, but I'm sure I will upgrade it, depending on the graphic card I can upgrade to
And of course I want to change the chassis for a bigger one, depending on the graphics too, I have the hp prebuilt one
I don't know how to check if I have UEFI BIOS, how could I see that? Anyways, probably I don't have it, I can't find any BIOS update for this motherboard, I have AMI 7.13, and hp doesn't give me the last one (7.15)
Correction: my system information says I have UEFI, at least that's what I see; AMI 7.13, 05/04/2011, SMBIOS version 2.6, driver 255.255, BIOS mode UEFI
This is my pc:
https://icecat.us/es-mx/p/hp/qn686aa/pcs-estaciones-de-trabajo-Pavilion+p7-1080la-9515452.html
This is my BIOS version:
https://linux-hardware.org/?id=bios:ami-7-13-05-04-2011
And this is a site of upgrades for my pc, but I don't understand much about it:
https://linux-hardware.org/?probe=f886c11963&upgrade
I've seen people talking about using a GTX 660, but I know this one is a DDR5 graphic card, and my motherboard is DDR3, would it works? I think I would need the BIOS you mentioned, so I was considering the ZOTAC GT 730 4GB, I need help about deciding and not finally getting a black screen =(
Thank you, by the way!