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NAS and Ethernet Planner: Bottlenecks and Switch Ports

Map the PC, Ethernet adapter, switch and NAS. Calculate the lowest link-rate ceiling, count ports and identify which upgrade would leave the same bottleneck in place.

Prepared by the Signalwise Picks editorial desk · evidence checked October 19, 2026 · official specifications and transparent calculations; no hands-on testing

The practical answer

A single PC-to-NAS flow is limited by the lowest negotiated link on its path and can be slower still because of disks, CPU, overhead and other traffic. A 2.5GbE or 10GbE switch does not upgrade a 1GbE endpoint. Count the NAS and each physical upstream cable in the switch-port budget.

Your equipment, your constraints

Map your PC-to-NAS path

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The reference behind the result

Official-spec evidence checked October 19, 2026. These tables stay readable without running the interactive checker. Supported counts and dimensions do not establish every assembled configuration.

A simple local path: what each number establishes
CheckExampleLimit
Lowest linkPC 5 → adapter 1 → switch 2.5 → NAS 2.5Gbps1Gbps link ceiling; a faster switch leaves the adapter limit
Line-rate arithmetic2.5 × 1000 ÷ 8 = 312.5MB/sBefore overhead; no measured file-copy prediction
Physical port budget4 wired devices + 1 upstream = 5 portsA five-port switch is full; NAS is one of the wired devices
Original Tiny NICM720q: I219-V; M920q/M920x: I219-LM1GbE; confirm a supported adapter, driver and host path for multi-gig

Sources and limits

We have not physically tested these combinations. An official limit, a suggested acceptance test and an independently measured result are different evidence types. Unknown configurations remain unknown. Merchant identity, price and stock must be checked separately.

Decisions the specifications alone do not settle

Draw the local path separately from the internet

Write PC → NIC or adapter → switch → NAS and label the actual negotiated rate at each hop. Internet-plan speed is not on this local data path unless the traffic goes to a remote destination. For an integrated NIC, use its negotiated rate for the PC and NIC inputs; for a USB adapter, the host input represents the upstream USB ceiling. A dock may share that bandwidth with disks and graphics. The calculator uses a simplified serial path, not a promise that all devices can transmit at full speed simultaneously.

Use the minimum rate as a ceiling, then verify throughput

The calculation takes the minimum of the four selected rates. Converting Gbps to MB/s uses Gbps × 1000 ÷ 8, giving 125MB/s at 1Gbps and 312.5MB/s at 2.5Gbps before overhead. These are arithmetic line-rate ceilings, not file-copy measurements. Ethernet and transport overhead, storage latency, encryption, CPU, drivers and concurrent activity can all lower throughput. Link aggregation does not automatically give a single ordinary transfer the sum of all member links, and it is outside this planner's model.

Budget ports before choosing five versus eight

Count every device attached to this switch, including NAS, desktop, access point and wired mesh node. Add the upstream physical connection to the router or next switch separately. Do not double-count the same cable or count a phone using Wi-Fi as a switch port. Leave intentional headroom if another fixed device is planned. A five-port switch with one upstream and four endpoints is full even when only one of those endpoints needs multi-gig. PoE power budgets and managed VLAN behavior are separate decisions that this rate calculator does not validate.

Upgrade the part that changes the complete path

If the PC uses a dock's 1GbE port, replacing a 2.5GbE switch with a 10GbE model will leave that endpoint ceiling unchanged. Check a documented USB Ethernet adapter, driver and upstream port, or a suitable NIC. For Tiny PCs, an internal PCIe network card can conflict with the 2.5-inch drive bay; confirm the computer's model and installation parts first. Cable condition and negotiation also matter: investigate a link unexpectedly falling back to 100Mbps before buying a new router. Verify the real path under normal traffic and a controlled local test.

Common questions

Will a 10GbE switch make my original Tiny PC port faster?

No. The original documented M720q/M920q/M920x Ethernet port is 1GbE. A faster supported adapter or NIC and a complete faster path are needed; the switch alone does not change the NIC.

Is 312.5MB/s a predicted NAS file-copy speed?

No. It is the arithmetic conversion of 2.5Gbps before overhead. The planner does not measure disk, CPU, protocols or shared traffic and does not predict sustained application throughput.

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