ServeTheHome has published an early hardware look at Noctua’s NH-U14S DX4677 on Intel’s Xeon 600 workstation platform, and the useful bit is compatibility: the cooler can be used with an Intel Xeon 658X, a 250W Xeon W chip, despite that processor using LGA4710 mounting, provided the correct carrier frame is in place.
That is the kind of workstation detail that tends to get buried under socket names and cooler suffixes, then resurfaces when someone is staring at a board with an expensive processor and no sensible way to remove heat from it. ServeTheHome said it bought the unit from Amazon for use with a forthcoming Xeon 658X review.
What the DX4677 variant changes
According to ServeTheHome, the NH-U14S DX4677 is based on Noctua’s NH-U14S heatsink and fan design, adapted with a larger contact plate for Intel server and workstation processors. The outlet identified the target platform as Intel Xeon Sapphire Rapids, Emerald Rapids, and Xeon 6 processors in the smaller socket families.
ServeTheHome also drew a boundary around that compatibility, saying this cooler is for the smaller Xeon 6 sockets and not for Intel’s Xeon 6900E+ or 6900P series. That caveat is doing real work. “Xeon 6” covers more than one physical platform, which is a fun way for procurement spreadsheets to become thermal engineering problems.
The review unit arrived with the heatsink and fans already assembled, according to ServeTheHome. Installation still required taking the cooler apart and putting it back together on the motherboard, so preassembled does not mean drop-in.
Fans, paste, and the box contents
The cooler uses two Noctua NF-A15 140mm PWM fans. ServeTheHome described the setup as quiet, while noting the cooler has a tall profile. The report did not include measured thermals or sound levels, so that should be read as an early hands-on observation rather than a benchmark result.
The heatsink includes fan clips and heatpipes, with the familiar tower layout associated with the NH-U14S line. ServeTheHome’s photos also showed the unit installed in an Asus Pro WS W890E Sage SE workstation motherboard.
Noctua ships the NH-U14S DX4677 with thermal interface material already applied to the base, according to ServeTheHome. The outlet called that a positive choice for workstation and server-class coolers, where repeatable installation matters and nobody gets extra points for manually smearing paste across a large heat spreader.
The box also includes a Y cable and an installation tool. ServeTheHome said those accessories are useful, especially outside lab environments where spare tools and cables are not sitting in bins next to a weekly CPU swap pile.
For now, the takeaway is limited but practical: ServeTheHome found the NH-U14S DX4677 mechanically usable for a Xeon 658X build with the right carrier frame, and the cooler arrives with the core accessories needed for installation. Performance numbers will have to wait for the outlet’s Xeon 658X review.
This story draws on original reporting from ServeTheHome.
