PCIe 4.0 ×16 Riser Cable 40 cm — 90° Angled, Right-Out / Left-In
PCIe 4.0 ×16 · 40 cm · Passive · Shielded PCIe 4.0 ×16 Riser Cable — 40 cm, 90° Angled A full-bandwidth Gen4 ×16 riser with aluminium-foil-shielded differential pairs and a braided sleeve. Passive, so it needs no power and stays invisible to the system. This is the riser we use in our own multi-GPU builds. 4.0 Gen PCIe generation ×16 Full lane width 40 cm Cable length 90° Angled connectors Orientation Right-out / left-in — check this before you order This is the right-out / left-in version. The angled connectors are handed, so orientation is fixed and it is the one detail people get wrong. Work out which way the cable needs to leave the slot and enter the card in your chassis before ordering — if you need the mirrored version, ask us and we will supply that instead. Why the shielding matters Signal integrity at Gen4 speeds PCIe 4.0 runs at 16 GT/s per lane — roughly 32 GB/s per direction across sixteen lanes. At that rate a riser stops being a cable and becomes a transmission line: crosstalk and loss decide whether the link trains at Gen4 or quietly falls back. This one uses aluminium-foil-shielded differential pairs to keep the pairs isolated, which is what makes a run of this length viable at full Gen4 rather than Gen3. Practical note: 40 cm is a long run for a passive Gen4 riser. On most boards it trains at Gen4 without complaint. If yours is marginal — a heavily loaded platform, or a slot fed through a switch — you can pin the slot to Gen3 in BIOS and keep full stability with no other change. Tell us your board and GPU count and we will tell you what to expect. Specifications Technical data Interface PCIe 4.0 ×16 (backward compatible with 3.0 / 2.0) Bandwidth Full ×16 — up to ~32 GB/s per direction at Gen4 Length 40 cm Cable type Linear, braided mesh sleeve Shielding Aluminium foil over differential pairs Connectors 90° angled — right-out / left-in Type Passive — no redriver, no external power Compliance RoHS · UL Best for Where it fits Multi-GPU AI servers where cards sit off-board on a riser plate. Tight 4U and rack enclosures — the 90° exit removes the cable loop that blocks airflow. Vertical GPU mounts in tower and workstation builds. Relocating a card away from a hot neighbour or a blocked slot. Any Gen4 GPU where you do not want to give up half your bandwidth to a mining-grade extender. This is not a mining riser. The ×1 powered USB extenders sold for GPU rigs throttle a modern GPU to a fraction of its bandwidth. This carries all sixteen lanes at Gen4 — which is the whole point if the card is doing AI work. Questions FAQ Does it need power? No. It is a passive riser — it carries the slot's own signals and power straight through, with no connector to plug in and nothing for the system to configure. Will I lose performance versus a direct slot? When the link trains at Gen4 ×16, no — you have the same lane count and the same rate as the slot itself. The only failure mode worth knowing about is a marginal link dropping to Gen3, which halves per-lane rate. The shielding is there specifically to avoid that. Can I use it with a PCIe 5.0 board or card? Physically yes, and it will work — but the link negotiates down to Gen4, which is the cable's rating. If you need full Gen5 on a riser, that is different hardware; ask us. Which orientation do I need? This one is right-out / left-in. Look at where the cable has to run in your case: if it needs to leave the slot the other way, you want the mirrored part. We stock both — just ask before ordering if you are unsure. Do you have other lengths? Yes, 30 cm and 50 cm as well. Shorter is always better for signal integrity, so take the shortest run that physically reaches. Building a multi-GPU machine? Kentino assembles, benchmarks and commissions complete AI servers and workstations — risers, plates, power and airflow all specified together. Browse the AI Servers collection.