When searching for a reliable 4K FUSER that supports a 3440x1440 ultrawide monitor, the options are quite limited among the various DMA hardware products on the market. This is especially true if you're willing to cap your refresh rate at 100Hz instead of using the native 144Hz achievable via DisplayPort. Some users initially tried products made by non-professional video fuser manufacturers, only to find that they do not support ultrawide resolutions properly.
One of the most recommended options at the moment is the DC500 FUSER from the official Dichen store. It supports 3440x1440 @100Hz over HDMI and has received positive user feedback. However, it does come with a higher price tag—around $550, including international shipping—mainly because it's built with Xilinx's top-tier XCKU5P series FPGA chip, which alone costs nearly $100. (You can check the latest pricing on the official Dichen store.)
The good news is that the latest firmware update has added support for 4K @160Hz, making it a fairly “future-proof” choice. Most users agree that while dropping from 144Hz to 100Hz is noticeable, the performance is still acceptable. However, if you're used to high refresh rates, you may experience a "rubberbanding" effect—where everything feels slightly sluggish.
For those with the budget, it's recommended to buy directly from Dichen's official website, which is independently run by the Dichen factory and offers full after-sales support and international service. Buying from Taobao may give you the same price, but you'll need to arrange a third-party forwarding service and pay extra for international shipping.
In summary, if you're looking for both performance and long-term reliability, the DC500 4K FUSER remains one of the best choices currently available.