{"product_id":"diliving-pcie-4-0-slimssas-x4-to-u-3-nvme-adapter-sff-8654-38pin-to-sff-8639-68pin-cable-with-sata-power-75cm","title":"DiLinKer SlimSAS x4 (SFF-8654 38-Pin) to U.3 NVMe Cable, SFF-8639, with SATA Power, 75cm","description":"\u003cp\u003eA four-lane PCIe cable from \u003cstrong\u003eSlimSAS 4i (SFF-8654, 38-pin)\u003c\/strong\u003e to a \u003cstrong\u003eU.3\u003c\/strong\u003e drive on the 68-pin SFF-8639 shell, 75 cm, with a SATA power tail. Read the next paragraph before you buy: the connector looks like U.2 and is not wired like it.\u003c\/p\u003e\n\u003ch2\u003eU.3, not U.2 — and why that matters\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSame shell, different pin assignment.\u003c\/strong\u003e U.3 kept the 68-pin SFF-8639 connector so a single bay could take NVMe, SAS or SATA drives, but it reassigned pins to do it. This cable is wired for the U.3 arrangement. Put a U.2 drive on it and it will usually not enumerate at all — no error, just no device.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRated PCIe 4.0 x4.\u003c\/strong\u003e Four lanes at 16 GT\/s each, roughly 7.9 GB\/s of usable bandwidth, provided the host port and the drive are both Gen4. The 68-pin connector is not a speed limit — the drive and the host link decide the rate, not the shell.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe SATA tail feeds the drive.\u003c\/strong\u003e A 2.5″ U.3 SSD has no other power input; it needs 12 V and 5 V from the PSU. The 15-pin tail is part of the cable, not an optional extra.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e38-pin end where space is tight.\u003c\/strong\u003e SlimSAS shrank the 4i connector so more ports fit along a board edge. If your controller or riser exposes SFF-8654 rather than SFF-8643, this is the cable that reaches a U.3 bay.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable style=\"width:100%;border-collapse:collapse;font-size:14px\"\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #e3e6ea;padding:7px 10px;background:#f7f8fa;width:34%\"\u003e\u003cstrong\u003eConnector A\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #e3e6ea;padding:7px 10px\"\u003eSlimSAS 4i, SFF-8654, 38-pin\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #e3e6ea;padding:7px 10px;background:#f7f8fa;width:34%\"\u003e\u003cstrong\u003eConnector B\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #e3e6ea;padding:7px 10px\"\u003eU.3, SFF-8639, 68-pin\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #e3e6ea;padding:7px 10px;background:#f7f8fa;width:34%\"\u003e\u003cstrong\u003ePower\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #e3e6ea;padding:7px 10px\"\u003eSATA 15-pin tail\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #e3e6ea;padding:7px 10px;background:#f7f8fa;width:34%\"\u003e\u003cstrong\u003eLanes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #e3e6ea;padding:7px 10px\"\u003e4 (PCIe x4)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #e3e6ea;padding:7px 10px;background:#f7f8fa;width:34%\"\u003e\u003cstrong\u003eLength\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #e3e6ea;padding:7px 10px\"\u003e75 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #e3e6ea;padding:7px 10px;background:#f7f8fa;width:34%\"\u003e\u003cstrong\u003eSignal\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #e3e6ea;padding:7px 10px\"\u003ePCIe 4.0 x4 rated (~7.9 GB\/s)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #e3e6ea;padding:7px 10px;background:#f7f8fa;width:34%\"\u003e\u003cstrong\u003eProtocol\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #e3e6ea;padding:7px 10px\"\u003eNVMe on U.3 drives — not U.2, not SAS\/SATA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #e3e6ea;padding:7px 10px;background:#f7f8fa;width:34%\"\u003e\u003cstrong\u003ePart number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #e3e6ea;padding:7px 10px\"\u003eRSL38-3600-AX1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #e3e6ea;padding:7px 10px;background:#f7f8fa;width:34%\"\u003e\u003cstrong\u003eSKU\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #e3e6ea;padding:7px 10px\"\u003eB0CBP5BKJS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWorks with\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSlimSAS 4i host ports that carry PCIe lanes\u003c\/li\u003e\n\u003cli\u003eU.3 NVMe SSDs (the tri-mode pin arrangement)\u003c\/li\u003e\n\u003cli\u003eGen4 hosts and drives, which is where this cable earns its price\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eDoes not work with\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eU.2 drives\u003c\/strong\u003e — this is the single most common mistake with this cable\u003c\/li\u003e\n\u003cli\u003eSAS or SATA drives on the 68-pin end\u003c\/li\u003e\n\u003cli\u003e8-lane SlimSAS (74-pin) ports — those need an x8 fan-out cable\u003c\/li\u003e\n\u003cli\u003eU.3 backplane sockets — those need a cable with two plug ends\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eTypical deployments\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eGen4 U.3 drive on a SlimSAS controller.\u003c\/strong\u003e The controller exposes 38-pin ports; the drive is U.3; this is the one cable in the catalogue that joins them.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSingle-drive scratch or cache disk.\u003c\/strong\u003e One U.3 drive off one SlimSAS port, powered from the PSU, no backplane involved.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRack builds with mixed drive generations.\u003c\/strong\u003e Keep U.3 drives on their own cabling so a U.2 drive never gets plugged into the wrong one by mistake.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003ch3\u003eWill a U.2 drive work on this cable?\u003c\/h3\u003e\n\u003cp\u003eNo. That is the whole distinction. U.3 and U.2 share the physical 68-pin connector but not the pin assignment, so a U.2 drive normally does not enumerate. If your drive is U.2, take the U.2 version of this cable instead.\u003c\/p\u003e\n\u003ch3\u003eHow do I tell whether my drive is U.2 or U.3?\u003c\/h3\u003e\n\u003cp\u003eCheck the drive label or the vendor datasheet — U.3 parts are usually described as tri-mode. If you are unsure, send us the model number and we will tell you which cable to take. Getting this wrong is the number one return reason on this SKU.\u003c\/p\u003e\n\u003ch3\u003eIs it really PCIe 4.0?\u003c\/h3\u003e\n\u003cp\u003eThe assembly is rated for Gen4 signalling. Actual speed is set by the host port and the drive: any Gen3 link in the chain pulls it back to Gen3.\u003c\/p\u003e\n\u003ch3\u003eDo I need the SATA power tail?\u003c\/h3\u003e\n\u003cp\u003eYes. A 2.5″ U.3 SSD has no other power input.\u003c\/p\u003e\n\u003ch3\u003eCan I run SAS or SATA drives on it?\u003c\/h3\u003e\n\u003cp\u003eNot with this cable. The 68-pin end here is wired for NVMe on U.3.\u003c\/p\u003e\n\u003ch3\u003eMy drive powers up but is not detected — what now?\u003c\/h3\u003e\n\u003cp\u003eFirst check the drive is U.3 rather than U.2. Second, confirm the SlimSAS port carries PCIe lanes and not SAS. Third, try another port. If it still does not appear, send us the drive model and the controller model and we will work it out with you.\u003c\/p\u003e\n\u003ch2\u003eIn the box\u003c\/h2\u003e\n\u003cul\u003e\u003cli\u003e1 × SlimSAS 4i (SFF-8654) to U.3 (SFF-8639) cable, 75 cm, with SATA power\u003c\/li\u003e\u003c\/ul\u003e\n\u003cp\u003eEvery cable is continuity- and pinout-tested before it ships and carries a 24-month warranty. If a link does not train, send us the controller model and the backplane part number before returning anything — in most cases the cable is the wrong variant for the port, not faulty, and we would rather tell you that up front.\u003c\/p\u003e\n\u003ch2\u003eRelated\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/diliving-slimsas-4x-to-u-2-nvme-adapter-sff-8654-38p-to-sff-8639-68p-cable-with-power-75cm\"\u003eSlimSAS x4 to U.2 cable — the U.2 version\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/slimsas-8x-to-2x-u-2-nvme-adapter-with-power-sff-8654-sff-8639-75cm\"\u003eSlimSAS 8x to 2x U.2 cable, 75cm\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/collections\/slimsassff-8654\"\u003eAll SlimSAS (SFF-8654) cables\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"DiLinKer","offers":[{"title":"Default Title","offer_id":47981337641256,"sku":"B0CBP5BKJS","price":33.66,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0866\/1460\/6120\/files\/1-22.jpg?v=1712909770","url":"https:\/\/diliving.com\/products\/diliving-pcie-4-0-slimssas-x4-to-u-3-nvme-adapter-sff-8654-38pin-to-sff-8639-68pin-cable-with-sata-power-75cm","provider":"DiLiVing","version":"1.0","type":"link"}