FIELD GUIDESource-led reference

Internal PC discovery

PCIe slot size vs lane count and generation

Use x1, x4, x8 and x16 card-edge form as a physical clue while keeping active lanes, generation, bifurcation and platform support separate.

Question this page answers

Does the physical PCIe slot or card-edge size prove how many lanes are active or which PCIe generation the system supports?

What the current evidence can establish

The atlas can distinguish the represented x1, x4, x8 and x16 mechanical forms and expose bounded engineering context where it exists.

Mechanical form remains a different evidence layer from active electrical lanes, PCIe generation, bifurcation behavior and exact motherboard or device support.

Engineering sidecars already available

Permanent side-by-side distinctions

What to verify on the exact system

Stop line.

A larger PCIe slot does not by itself establish generation, active lane count, bandwidth or support for a particular card.

Existing evidence, stronger route.

These V52 guides reorganize facts and explicit unknowns already present in the atlas. They add no new hardware claim, universal pinout, measured performance result, compatibility verdict, installation approval or fabrication approval.

Evidence behind this page

Scope first. Source second. Approval separate.

11 linked sources · 17 scoped claims · 0 sources with inspection/access flags.

Page scope: A larger PCIe slot does not by itself establish generation, active lane count, bandwidth or support for a particular card.

Assessment 2026-10-22 · earliest scheduled source review 2027-01-04. This is a recorded-date assessment, not a live source check. Page-level independent review is not established by this panel.

Inspect 11 source scopes, access limits and dates

S281 · PCI Express x16 164-position card-edge connector

Amphenol Communications Solutions · Manufacturer / product-owner domain · inspected 2026-10-06 · due 2027-01-04

Within inspection window

Scoped support: Identifies a PCI Express x16 vertical card-edge connector with 164 positions; V43 uses form and position count only.

Not established / limitations: Identification/reference scope only. V43 does not convert this source into a universal pinout, fabrication drawing, electrical approval, protocol guarantee or end-to-end compatibility verdict.

Locator: Part specification detail

S324 · PCI Express x16 164-position card-edge connector 10146067-113A0LF

Amphenol Communications Solutions · Manufacturer / product-owner domain · inspected 2026-10-06 · due 2027-01-04

Within inspection window

Scoped support: Engineering-scoped inspection of Amphenol 10146067-113A0LF: PCIe x16 vertical card-edge connector, 164 positions and 1.00 mm pitch.

Not established / limitations: Product geometry and position count do not establish a universal PCIe lane map, motherboard implementation, protocol generation or fabrication tolerance.

Locator: Description and part specification detail

S336 · Amphenol PCI Express card-edge series — x1 36-position form

Amphenol Communications Solutions · Manufacturer / product-owner domain · inspected 2026-10-06 · due 2027-01-04

Within inspection window

Scoped support: Manufacturer series reference for the PCI Express x1 mechanical/contact-count form only.

Not established / limitations: Source-backed identification does not establish universal wiring, protocol generation, device compatibility, safe installation or fabrication approval.

Locator: Product-series description and standard pin-count/lane-width summary

S337 · Amphenol PCI Express card-edge series — x4 64-position form

Amphenol Communications Solutions · Manufacturer / product-owner domain · inspected 2026-10-06 · due 2027-01-04

Within inspection window

Scoped support: Manufacturer series reference for the PCI Express x4 mechanical/contact-count form only.

Not established / limitations: Source-backed identification does not establish universal wiring, protocol generation, device compatibility, safe installation or fabrication approval.

Locator: Product-series description and standard pin-count/lane-width summary

S338 · Amphenol PCI Express card-edge series — x8 98-position form

Amphenol Communications Solutions · Manufacturer / product-owner domain · inspected 2026-10-06 · due 2027-01-04

Within inspection window

Scoped support: Manufacturer series reference for the PCI Express x8 mechanical/contact-count form only.

Not established / limitations: Source-backed identification does not establish universal wiring, protocol generation, device compatibility, safe installation or fabrication approval.

Locator: Product-series description and standard pin-count/lane-width summary

S357 · Amphenol PCI Express Gen 3 Card Edge Connectors engineering reference

Amphenol Communications Solutions · Manufacturer / product-owner domain · inspected 2026-10-06 · due 2027-01-04

Within inspection window

Scoped support: Manufacturer-series context for PCIe x1/x4/x8 card-edge contact counts and 1.00 mm pitch only.

Not established / limitations: Pitch and position count do not establish PCIe generation, lane enablement, bifurcation, board layout, electrical compliance or fabrication approval.

Locator: Series overview: 1.00 mm pitch and standard 36/64/98/164/280 position counts

S429 · PRIME B550-PLUS AC-HES User’s Manual

ASUS · Manufacturer / product-owner domain · inspected 2026-10-08 · due 2027-01-06

Within inspection window

Scoped support: Selected storage and PCIe slot roles for PRIME B550-PLUS AC-HES only, with CPU, slot population and SATA-sharing conditions.

Not established / limitations: Not the ordinary PRIME B550-PLUS or every B550 motherboard. Selected internal groups only; no current BIOS verification, boot qualification, entire port inventory or hardware test. Manual conditions must not be generalized.

Locator: E18712, First Edition, July 2021; specification summary printed vi–vii and layout 1-2. PDF pages 2, 6, 7 and 12 visually inspected.

S825 · 3M Twin Axial PCI Express Extender Assemblies Gen 5.0 / PCIe Extender Cable Assy Gen 5

3M · Manufacturer / product-owner domain · inspected 2026-10-21 · due 2027-01-19

Within inspection window

Scoped support: Exact named pinout variant only; not capability or compatibility approval.

Not established / limitations: Source scope and unresolved evidence are preserved in the engineering variant.

Locator: sheet 5 of 6, X16 PINOUT TABLE, Side B and Side A columns; sheet 5 of 6, X8 PINOUT TABLE, Side B and Side A columns

S826 · COM Express Carrier Board Design Guide

PICMG (manufacturer-hosted copy: Kontron) · Unclassified publisher domain · inspected 2026-10-21 · due 2027-01-19

Within inspection window

Scoped support: Exact named pinout variant only; not capability or compatibility approval.

Not established / limitations: Source scope and unresolved evidence are preserved in the engineering variant.

Locator: p. 37 Figure 7 PCI Express x1 Slot Example, J1 B3; p. 38, section 2.3.5.4, Figure 8 PCI Express x4 Slot Example, J2 contacts; p. 47 section 2.3.6.1 Polarity Inversion; p. 47 section 2.3.6.1 Polarity Inversion; p. 38 Figure 8 J2 A29/A30; p. 52, section 2.4.3.1, Figure 18 x1, x4, x8, x16 Slot, J5 connector-symbol pin labels

S827 · ConnectX-3 Pro Ethernet Single and Dual SFP+ Port Adapter Card User Manual

Mellanox Technologies (NVIDIA official host) · Unclassified publisher domain · inspected 2026-10-21 · due 2027-01-19

Within inspection window

Scoped support: Exact named pinout variant only; not capability or compatibility approval.

Not established / limitations: Source scope and unresolved evidence are preserved in the engineering variant.

Locator: p. 55, Appendix A.2, Figure 15 PCIe Connector Pinout, J6 A13/A14 reference-clock labels; p. 55, Appendix A.2, Figure 15 PCIe Connector Pinout, all J6 contacts B1-B49/A1-A49

S830 · CB1061 Manual

Beckhoff Automation GmbH & Co. KG · Unclassified publisher domain · inspected 2026-10-21 · due 2027-01-19

Within inspection window

Scoped support: Exact named pinout variant only; not capability or compatibility approval.

Not established / limitations: Source scope and unresolved evidence are preserved in the engineering variant.

Locator: p.43 §3.4.6 Pinout PCI-express-x1 connector; pp.44-45 §3.4.7 PCI-express interface (x4), complete A1-A32/B1-B32 table

Trace 17 claims to their source records

C261A · P261

Amphenol identifies part 10146067-113A0LF as a PCI Express x16 card-edge connector with 164 positions.

Claim scope: V43 catalogue-expansion identification fact only; not independent technical approval, fabrication data, wiring instruction, protocol guarantee or end-to-end compatibility proof.

Source links: S281 · Evidence trail → (private workspace)

C261B · P261

Amphenol specifies 10146067-113A0LF as a vertical PCI Express x16 card-edge connector with 164 positions on a 1.00 mm pitch.

Claim scope: V48 product-level mechanical identifier only; no universal PCIe lane assignment, generation support or motherboard implementation is inferred.

Source links: S324 · Evidence trail → (private workspace)

C261C · P261

The AC-HES manual distinguishes physical x16 slots from wired modes: the chipset PCIe 3.0 x16_4 slot supports x4 mode, falling to x1 when any of the specified x16_2, x16_3 or x16_5 slots is occupied.

Claim scope: E18712 printed vi and layout 1-2; exact board and population condition, not a universal PCIe x16 lane rule.

Source links: S429 · Evidence trail → (private workspace)

C295A · P295

Amphenol identifies the standard PCI Express x1 card-edge connector form with 36 positions/contacts in its PCIe connector range.

Claim scope: V50 identification fact only; no wiring, protocol compatibility, installation or fabrication approval is inferred.

Source links: S336 · Evidence trail → (private workspace)

C295B · P295

Amphenol’s PCI Express card-edge series identifies a 36-position x1 connector at 1.00 mm pitch.

Claim scope: Mechanical/contact-count context only; no PCIe generation, lane enablement, logical pin assignment or board-layout approval is inferred.

Source links: S357 · Evidence trail → (private workspace)

C296A · P296

Amphenol identifies the standard PCI Express x4 card-edge connector form with 64 positions/contacts in its PCIe connector range.

Claim scope: V50 identification fact only; no wiring, protocol compatibility, installation or fabrication approval is inferred.

Source links: S337 · Evidence trail → (private workspace)

C296B · P296

Amphenol’s PCI Express card-edge series identifies a 64-position x4 connector at 1.00 mm pitch.

Claim scope: Mechanical/contact-count context only; no PCIe generation, lane enablement, logical pin assignment or board-layout approval is inferred.

Source links: S357 · Evidence trail → (private workspace)

C297A · P297

Amphenol identifies the standard PCI Express x8 card-edge connector form with 98 positions/contacts in its PCIe connector range.

Claim scope: V50 identification fact only; no wiring, protocol compatibility, installation or fabrication approval is inferred.

Source links: S338 · Evidence trail → (private workspace)

C297B · P297

Amphenol’s PCI Express card-edge series identifies a 98-position x8 connector at 1.00 mm pitch.

Claim scope: Mechanical/contact-count context only; no PCIe generation, lane enablement, logical pin assignment or board-layout approval is inferred.

Source links: S357 · Evidence trail → (private workspace)

C809J · P261

3M Gen 5 PCIe x16 extender pinout: original contact normalization. Statuses distinguish comparison agreement, source limits and named-device wiring.

Claim scope: Pinout variant only; see comparison and per-contact status. Not fabrication approval.

Source links: S825 · Evidence trail → (private workspace)

C809K · P261

PICMG design-guide x16 reference slot: original contact normalization. Statuses distinguish comparison agreement, source limits and named-device wiring.

Claim scope: Pinout variant only; see comparison and per-contact status. Not fabrication approval.

Source links: S826 · S827 · Evidence trail → (private workspace)

C809T · P295

Beckhoff CB1061 PCIe x1 slot: original contact normalization. Statuses distinguish comparison agreement, source limits and named-device wiring.

Claim scope: Pinout variant only; see comparison and per-contact status. Not fabrication approval.

Source links: S830 · Evidence trail → (private workspace)

C809U · P295

PICMG design-guide x1 reference slot: original contact normalization. Statuses distinguish comparison agreement, source limits and named-device wiring.

Claim scope: Pinout variant only; see comparison and per-contact status. Not fabrication approval.

Source links: S826 · S827 · Evidence trail → (private workspace)

C809V · P296

Beckhoff CB1061 PCIe x4 slot: original contact normalization. Statuses distinguish comparison agreement, source limits and named-device wiring.

Claim scope: Pinout variant only; see comparison and per-contact status. Not fabrication approval.

Source links: S830 · Evidence trail → (private workspace)

C809W · P296

PICMG design-guide x4 reference slot: original contact normalization. Statuses distinguish comparison agreement, source limits and named-device wiring.

Claim scope: Pinout variant only; see comparison and per-contact status. Not fabrication approval.

Source links: S826 · S827 · Evidence trail → (private workspace)

C809X · P297

3M Gen 5 PCIe x8 extender pinout: original contact normalization. Statuses distinguish comparison agreement, source limits and named-device wiring.

Claim scope: Pinout variant only; see comparison and per-contact status. Not fabrication approval.

Source links: S825 · Evidence trail → (private workspace)

C809Y · P297

Mellanox ConnectX-3 Pro x8 card — source-scoped pin labels: original contact normalization. Statuses distinguish comparison agreement, source limits and named-device wiring.

Claim scope: Pinout variant only; see comparison and per-contact status. Not fabrication approval.

Source links: S826 · S827 · Evidence trail → (private workspace)

Prepare this page for review → (private workspace)Read the evidence method →

Recorded evidence only. An inspection date, publisher label, source link or generated packet is not independent technical review, hardware testing, fabrication approval or a compatibility verdict.