I have a 7 years old 13 inch Macbook Pro with NVIDIA GeForce 9400M graphics processor. I just tested and confirmed it can support LG 34UM95-P with 3440x1440@50Hz using miniDP to DP cable.
To Achieve this, two step need to be taken.
1) Turn Off Your Internal Screen on MacBooks (Clamshell mode, with the lid open). With the internal screen off, there is enough GPU to support 34UM95-P. Here is a link about how you can do it: https://www.geekdime.com/turn-off-your-internal-screen-on-macbooks/
PS: If you are running windows 7 on a Macbook, you can just select the external display only.
2)Customize the resolution. SwitchResX is the application you can customize the resolution. The native resolution it can achieved is 2560x1080@60Hz. When I started using SwitchResX, it gave me a 3440x1440@30Hz. That's not acceptable. But after changing a few settings, I can finally get the 3440x1440@50Hz.
Conclusion:
With a upgrade to 8G ram and SSD, I think my 7 years old machine can keep running for another few years. Anyone has a newer Macbook should be able to drive the LG34UM95 or similar monitors.
^_^
To Achieve this, two step need to be taken.
1) Turn Off Your Internal Screen on MacBooks (Clamshell mode, with the lid open). With the internal screen off, there is enough GPU to support 34UM95-P. Here is a link about how you can do it: https://www.geekdime.com/turn-off-your-internal-screen-on-macbooks/
PS: If you are running windows 7 on a Macbook, you can just select the external display only.
2)Customize the resolution. SwitchResX is the application you can customize the resolution. The native resolution it can achieved is 2560x1080@60Hz. When I started using SwitchResX, it gave me a 3440x1440@30Hz. That's not acceptable. But after changing a few settings, I can finally get the 3440x1440@50Hz.
Conclusion:
With a upgrade to 8G ram and SSD, I think my 7 years old machine can keep running for another few years. Anyone has a newer Macbook should be able to drive the LG34UM95 or similar monitors.
^_^