SlimSAS x8 (SFF-8654) to 2x MCIO x4 (SFF-TA-1016) Cable, 80 cm
SlimSAS x8 (SFF-8654) to 2x MCIO x4 (SFF-TA-1016) Cable, 80 cm
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The bridge in the other direction: a SlimSAS 8x host connector (SFF-8654, 74-pin) splits its eight lanes into two MCIO 4x ports (SFF-TA-1016, 38-pin). Use this assembly to attach Gen5 MCIO devices — NVMe adapter cards, front bays, backplanes — to a controller or switch card that still speaks SlimSAS. It is the mirror image of the MCIO-to-SlimSAS fanout and covers the transition window where both standards live in the same chassis.
Why this cable
- PCIe 5.0 rated, 32 GT/s per lane. Two full x4 links, each up to about 15.75 GB/s; backward compatible with Gen4 and Gen3.
- 8 lanes in, 2 × x4 out. A physical lane split — no switch chip, no retimer, nothing to configure.
- Built to the SFF pinouts. SFF-8654 74-pin on the host side, SFF-TA-1016 38-pin on the device side.
- Double straight construction. Both legs leave the host connector as separate straight runs.
- Passive assembly. No power draw, no firmware, no driver.
Specifications
| Host connector | SlimSAS 8x, SFF-8654, 74-pin |
| Device connector | 2 × MCIO 4x, SFF-TA-1016, 38-pin |
| Lanes | 8 host lanes → 2 × 4 device lanes |
| Interface speed | PCIe 5.0, up to 32 GT/s per lane |
| Protocol | PCIe, as determined by the host port |
| Cable length | 80 cm / 31.5 in |
| SKU | B0CGD5G29N |
| Warranty | 12 months |
Compatibility
Works with
- Controllers, switch cards and boards with SlimSAS 8x (SFF-8654) 74-pin ports.
- MCIO 4x devices: U.2/M.2 adapter cards, Gen5 front bays, MCIO backplanes.
- PCIe 4.0 and 3.0 equipment — links negotiate down automatically.
Does not work with
- MCIO 8x (74-pin) device ports — use an 8x-to-8x cable for those.
- SAS-only hosts driving NVMe devices — the protocol follows the host port.
- Drives connected directly — each MCIO end must meet a port on a card, cage or backplane.
Typical deployments
- Controller to Gen5 bays. A SlimSAS-generation card feeding two MCIO U.2 adapters or front bays.
- Mixed-generation chassis. Keep existing SlimSAS cabling on the host side while moving devices to MCIO.
- Balanced lane use. Split one x8 port into two independent x4 devices instead of adding a switch.
Frequently asked questions
How is this different from the MCIO x8 to 2×SlimSAS x4 cable?
Direction and host standard. That cable starts from an MCIO host; this one starts from a SlimSAS 8x host and ends in two MCIO 4x ports. Pick the one whose host connector matches your board.
Do both MCIO ports run at Gen5?
Yes. Each leg is a full x4 PCIe 5.0 link, subject to what the host port and the device negotiate.
Can the two legs go to different devices?
Yes. They are independent x4 links — a U.2 adapter on one and an M.2 card or bay on the other works fine, as long as the host port supports the devices.
Will it work in a PCIe 4.0 system?
Yes. On a Gen4 host both legs negotiate to 16 GT/s, and on Gen3 hardware to 8 GT/s. The cable is passive and passes whatever the host and the devices agree on.
In the box
- 1 × SlimSAS 8x to 2 × MCIO x4 cable, 80 cm (SKU B0CGD5G29N)
Backed by a 12-month warranty. If a link trains at reduced width or does not appear, contact us with your controller and device models and we will help you isolate the cause.
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