Paul wrote:

This card is a "two fan compact" card, when other versions
of the card are "three fan full sized" card.

The OP's video card has no fans. Although it's an AMD 750 Ti design, it
has no fan(s).

Product image:
https://tpucdn.com/review/palit-gtx-.../pressshot.jpg

According to the review article the OP linked to, back when the card was
introduced in 2014, it was the only passively cooled 750 Ti design.

DVI is available with single link (1920x1200) or dual link
(2560x1600). As long as "all the pins" (dual link) on the DVI
connector are in usage, then the DVI/HDMI/DP are all the same in
terms of what they offer to the owner of a 2560x1600 monitor. If your
DVI happened to be single link (causing that monitor to run in a
non-native resolution), then you might want to upgrade just to get
native resolution operation.

The specs for the OP's video card says it supports 2560x1440 over its
DVI connection, so it must be dual-link DVI.

https://www.displaygeeks.com/wp-cont.../DVI-Types.jpg

For the dual-link DVI connector, there are no pins missing in the
missing of the pin matrix. From an image for the Palit GTX750ti video
card at:

https://www.ixbt.com/video3/images/g...50ti-front.jpg

those at DVI dual-link connectors. Well, they are dual-link DVI
connectors but it's possible there are no wires to the middle pins;
however, since the video card is spec'ed to 25620x1440 then those middle
pins should be connected and supported in the logic.

I couldn't find an image at Google for the backside of the OP's monitor
or for its connectors. The manual for the OP's monitor shows the
location of the DVI connector and lists it as "DVI-D 24pin". 24 pins
means fully populated in the connector, and DVD-D means dual-link.

So, the OP's video card and monitor both have DVI dual-link connectors
to support 2560x1440. The specs for the monitor state 2560x1440 is
still the max resolution when using its Display Port. That a connector
has higher specs doesn't mean they must support the max specs.

The OP will achieve no better support of his current monitor using a DP
port on a new video card than what his current video card can support
using the DVI-D connections between old video card and old monitor.