PCIe 4.0 ×16 Riser Cable 40 cm — 90° Angled, Right-Out / Left-In
Enterprise-grade platform, assembled and tested in the EU.
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.
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.
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.
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 |
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.
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.
The questions buyers ask us most often before ordering a server.
How long does it take?
Machines built from components we hold ship quickly; anything requiring a specific GPU generation depends on supply. We give you a date before you pay, and if it moves we tell you rather than letting you find out.
Can the configuration be changed before you build it?
Almost always. GPUs, memory, storage and cooling are chosen per order, and the listed configuration is a starting point rather than a fixed package. If you need more VRAM, faster storage or a different cooling approach, say so before you order and we will quote the change.
Can I collect the server in person?
You can. Our warehouse is in Prague, and collection in person is welcome — most people who come use the visit to go through the machine with our engineer and ask the questions that are awkward over email. For orders within the Czech Republic we also try to deliver personally and walk you through the setup on site.
Can I talk to someone who actually understands the workload?
Yes. We have an engineer who works on AI systems specifically, not a general sales desk. If your question is about batch sizes, quantisation, interconnect or where your bottleneck will be, ask it — that conversation usually changes the configuration for the better.
Which model can I run on this configuration?
Yes. Every machine is assembled, burn-in tested and benchmarked on real AI workloads before it ships, and it leaves us with an LLM already installed and running. You plug it in, connect it to your network and start work — the only decision left is which project it runs first.
How do you test a server before shipping?
We run it against actual AI workloads rather than synthetic scores: inference throughput, sustained load behaviour and thermals under continuous operation. You get the benchmark results with the machine, so the performance you were promised is the performance you can verify on day one.
Is the server ready to run when it arrives?
Yes. Every machine is assembled, burn-in tested and benchmarked on real AI workloads before it ships, and it leaves us with an LLM already installed and running. You plug it in, connect it to your network and start work — the only decision left is which project it runs first.
Ships from our EU warehouse. Heavy items may require freight arrangement — contact us for a shipping quote and lead time. 2-year limited warranty with advanced RMA support; extended warranty available.
Not exactly what you need?
Tell us your workload and we'll spec this platform around it — GPUs, memory, storage and cooling matched to what you actually run.