Desk-Side AI: The Box, Its Price Curve, and What Else Is Under Your Desk

NVIDIA's DGX Spark is a desk-sized AI workstation: a mini-PC about 1.1 L in volume and 1.2 kg (IntuitionLabs) built on the GB10 Grace Blackwell superchip (20 Arm cores, 128 GB LPDDR5x unified memory, ~273 GB/s memory bandwidth, 140 W SoC TDP per Geizhals spec sheet), running NVIDIA's DGX OS from a 240 W external USB-PD power supply (ServeTheHome). It launched in October 2025. One year later, the street price has risen by roughly three-quarters. This piece assembles the actual price-over-time from archived listings and reporting, then prices the alternatives against it with acquisition costs, wall watts, annual energy at a German tariff, noise, and footprint.

The price curve

That is +73.8% over the launch price in twelve months, after a +17.5% step in February.

German street prices tell the same story with a lag, because the box sold near import pricing first. Geizhals "ab" prices (cheapest listed offer, live and archived via Wayback). Honest caveat on resolution: these are the only archived snapshots that actually carry a price — the page had no offers archived before February 2026, so the step to €5,799 is bracketed between 12 April and 3 October, not dated to the day.

That is +54.0% on the cheapest German offer between February and October 2026. Spot data on 17 October shows the spread that scarcity produces: one Amazon listing tracked low/avg/high of $3,999.99 / $4,909 / $6,500.99, while a second listing sat at $8,499.99 with a recorded high of $9,443.25 (pricehistory.app, second listing). Tom's Hardware's October street range quoted in the same reporting is $7,000-9,000 if you can find one in stock (WindowsForum summary).

What it costs at the wall

Tariff used: 34.4 ct/kWh, the Verivox average household electricity price for October 2026 in Germany (Verivox; same series: 31.64 ct/kWh at the start of 2026). Usage model for all rows: 4 h/day at load + 20 h/day idle, 365 days. Measured watts as cited; platform adders for the GPU rigs (idle +40 W, load +150 W) are stated assumptions, not measurements.

The Spark's idle draw (35-45 W, several measurements agree within that band) costs €105-136/year running headless at 34.4 ct/kWh — not much, but nowhere near the 9 W idle of a Mac Studio (€27.12/year). A 3×3090 rig at this tariff costs €823.67/year under the stated duty cycle — about five times the Spark's bill, which is the trade the 124.0 vs 38.6 tokens/sec difference buys (IntuitionLabs benchmark roundup).

The alternatives, priced

Used-card rigs (2×/3× RTX 3090). Verified eBay sold listings put a used 3090 at $1,127 (median through 17 October 2026; 30-day average $1,099, 90-day $950 — so roughly +18% over the quarter on memory-market pressure; GetPCParts). German asking prices: ab €1,390 (GPUDojo DE, October 2026). Cards only: 2× = $2,254 / €2,780; 3× = $3,381 / €4,170 — before the platform (board, CPU, PSU, case), which adds whatever your existing or budget tower costs. Against the $6,950 Spark, a 3×3090 card budget of $3,381 still buys 72 GB of GDDR6X at a fifth of the box's $/GB, ~3× its token rate (124.0 t/s), and no unified-memory ceiling at 24 GB per card — the 273 GB/s LPDDR5x is what the Spark sells you and what the 3090 rig does not have; memory bandwidth is the Spark's load-vs-speed split (IntuitionLabs). AMD's Strix Halo mini PCs land at ~$2,348 (comparable FP8/FP16 inference to the $4,699 Spark, same source) and remain the value line if you don't need CUDA.

Mac Studio (M5 Ultra class). Apple launched new Mac Studios on 25 August 2026: M5 Max from $2,499, M5 Ultra (96 GB/1 TB) from $5,499 — $1,500 above what the M3 Ultra cost at launch, after Apple's June 2026 lineup-wide increases attributed to RAM costs (The Verge, Macworld). German street: €9,425 ab for the 96 GB/4 TB configuration (Geizhals, fetched 18 Oct 2026). The relevant spec against the Spark is bandwidth: 1.2 TB/s on M5 Ultra vs 273 GB/s on GB10 (AppleInsider comparison) — about 4.4×, at a purchase price between the Spark's February and current tiers, with a fraction of the idle draw. The cost is the ecosystem: Apple Silicon inference runs on MLX/CoreML, not CUDA.

Cloud hours, break-even. RunPod lists RTX 3090 at $0.22/h (ComputePrices), A100 from $1.64/h and H100 from $2.39/h (GPUVec), October 2026. The $6,950 Spark purchase equals: 31,591 rental hours of a cloud 3090 (3.6 years of continuous rental; 21.6 years at 4 h/day), 4,238 hours of an A100 (0.48 years continuous; 2.9 years at 4 h/day), or 2,908 hours of an H100 (0.33 years continuous; 2.0 years at 4 h/day). The honest reading: renting a 3090-class GPU for evenings and weekends never catches the box — but if your workload genuinely needs A100/H100-class hardware, the owned-hardware argument over a 3-5 year horizon runs the other way. ServeTheHome's own arithmetic — $6,950 is nearly three years of a $200/month subscription — lands in the same place for chat-subscription users (ServeTheHome).

What to watch

• Whether the 64 GB OEM model at $4,999 (on sale 23 October) pulls the entry price down in practice, or whether OEMs list it higher — the $4,999 figure is NVIDIA's stated start price; partner pricing varies (ServeTheHome).
• Memory-market direction: every increase since February is blamed on DRAM/NAND supply; if memory prices break, used 3090 ($1,127 and climbing) and Spark street prices both move, and the break-even rows above shift with them.
• German street prices are still converging upward: €6,599 was €5,799 two weeks ago on Geizhals. A 2×3090 used rig (cards only, €2,780) remains well under half a Spark's German street price today.

*All prices and power figures fetched 18 October 2026; the chart is generated from the table above. Tariff is a public average, not a household quote — your per-kWh rate is what scales the € figures.*