Does this support surface pro 6 laptop display + 3 external monitors (total 4 displays)?

Hello, No, unfortunately, the Surface Pro 6 is hardware limited to 2 external displays.

Would I be able to maintain 144hz refresh on 3 1440p monitors?

Hello, The mDP-3DP Multi Monitor Splitter supports the resolution of 1920x1080 @ 60Hz for 3 monitors. So unfortunately it would not support 1440p@144hz. Accell Support.

Does this support 1080p 240hz?

I use it with 120Hz triple monitors and worked fine don’t know about 250Hz

I need to connect two dell monitors with a microsoft surface book. will i need to connect both usb and minidisplay to laptop or can use just one?

Hello, Yes, you will have to connect both USB and mDP to your Surface Book. The Mini Displayport connection is for transferring video data and the USB connection for powering the MST device.

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🖥️ Elevate your workspace—because one screen is never enough!

DOUBLE YOUR WORKSPACE - Effortlessly extend your laptop screen to two HD monitors for ultimate productivity.
FLEXIBLE DISPLAY MODES - Supports both mirrored and extended displays via MST protocol for versatile setups.
PLUG AND PLAY SIMPLICITY - No drivers or extra power adapters—just connect and go.
POWER WITHOUT THE CLUTTER - Self-powered via USB-A cable, eliminating the need for bulky external power supplies.
CERTIFIED SURFACE PRO COMPATIBILITY - Specifically designed for Surface Pro 3 & 4, ensuring perfect fit and performance.

The Accell mDP-2DP Multi Monitor Splitter is a compact MST hub that expands a single Mini DisplayPort 1.2 output into two DisplayPort outputs, enabling dual HD monitor setups. Designed for Microsoft Surface Pro 3 and 4, it is self-powered via USB-A with plug-and-play ease, supporting both mirrored and extended display modes for enhanced multitasking.

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