The chip that ships with the module

Rambus, a San Jose designer of memory-interface chips and a licensor of memory-architecture patents, sells a registering clock driver into the server dual in-line memory modules (DIMMs) that plug into data-center processors. Its unit volumes are set by how many modules ship — not by how much buyers spend on the memory inside them. With DRAM contract prices up sharply, that distinction has become the case against the stock.

TrendForce forecasts that registered-DIMM bit supply will grow only 15-20% year over year, well short of projected server CPU shipments, and already anticipates a server DRAM shortage in 2027. Baird downgraded Rambus to Neutral on precisely that mechanism, holding its $120 target while arguing memory scarcity could cap growth through 2027.

The results themselves point the other way. June-quarter revenue was a record $207.4m, up 20.4%, with gross margin of 79.8% against 74.9% a year earlier. Product revenue reached a record $99.2m, overtaking royalties as the largest line. The September guide makes the mix shift explicit: product of $110-116m against royalties falling to $69-75m from $84.2m. The silicon cycle is carrying the licensing annuity, not the reverse. Management framed the volume driver as channel count — Advanced Micro Devices at 12 memory channels, Intel moving from eight to 12 — with each channel adding companion-chip content. It also conceded there is no pricing opportunity in standards-based parts, where Renesas and Shanghai-listed Montage Technology compete for the same socket, and described the pooling standard the group is named for, Compute Express Link (CXL), as "a fragmented ASIC market" it addresses through licensed intellectual property rather than products.

Microchip already finished its correction

Microchip Technology, the Arizona maker of 8-, 16- and 32-bit microcontrollers and analog parts sold to carmakers and factory-equipment builders, is the one member with real memory-disaggregation revenue — and the one whose downturn is over. June-quarter revenue was $1.485bn, up 38.0%. Gross margin reached 63.2% against 53.6% a year earlier, a fifth consecutive quarterly expansion, while operating margin recovered to 22.7% from a 3.0% trough.

Distributor inventory has been drawn to 25 days, the low end of its historical range, on the strongest booking quarter in roughly four years. September is guided to about $1.603bn, up 40.6% year over year. Management warned the guided 66-67% gross margin is not repeatable, flattered by a lumpy licensing quarter billed at full margin. Internal fabs are still underloaded, with underutilization charges guided to $30.5m from $38.5m. Data-center sales are the growth engine: roughly $591m in 2025 heading to about $1bn in 2026, with 14 PCIe Generation 6 design wins entering production at end-June. Net debt of about $5.2bn sits at 2.85x EBITDA, expected below 2.5x this quarter.

The two smaller names

Everspin Technologies, an 85-person maker of magnetoresistive RAM (MRAM) — memory that retains data without power — posted record revenue of $18.7m, up 41.9% and above its own guidance. The bulk of the surprise is a $40m, two-and-a-half-year subcontract with a United States prime contractor to qualify MRAM for the defense industrial base. Its pooling work is real but pre-revenue: a CXL-attached proof of concept scheduled for the Storage Networking Industry Association developer conference on 28-30 September, and an evaluation agreement with MaxLinear on storage acceleration for artificial-intelligence servers. Roughly $4m a quarter of litigation cost keeps the September quarter at a reported loss.

Allegro MicroSystems, which makes magnetic sensor and power chips for automotive motion control and has no memory content whatever, is the group's laggard on operations: revenue grew 27.5% to $259.2m but operating margin was 9.8% on a 48.5% gross margin, the thinnest of the four, and it carries the highest forward earnings multiple at 38.2x.

All multiple, no earnings

Trailing price-to-earnings is unusable across this group — Everspin's is negative, Allegro's runs to 486x, Microchip's 107x on trough profits — so price against gross profit is the lens that compares them. Against 21 May, Rambus compressed from about 28.0x to 16.6x while trailing gross profit grew 6.6%; Microchip from 18.2x to 13.6x on gross profit up 13.3%; Everspin from 25.9x to 12.5x on gross profit up 11.4%. Forward multiples sit below trailing at all three, meaning consensus still expects gross profit to rise.

Rambus broke trend first, leaving its uptrend on 6 July and turning negative on 22 July, four weeks before the others. The recent leg was not gentle: Rambus fell 10.6% across 18-19 August, Everspin 12.9% from its 17 August close, Allegro 11.0% in the 19 August session alone. The context was rates — the Philadelphia Semiconductor Index fell 4.96% as 30-year Treasury yields hit 19-year highs, and chip stocks kept falling on 19 August even after yields eased, inside a sector drawdown that has erased more than $1 trillion of chip-stock value since late July. Tellingly, Astera Labs — the pure-play CXL and PCIe fabric vendor these names are valued against — is roughly flat over the same three months. The pooling premium did not leave the company that actually carries it.

The setup

Where it stands — Three memory-adjacent chipmakers reported accelerating revenue and wider margins into June, then de-rated 15-46% on multiple alone. Would confirm — Rambus September product revenue landing in or above the guided $110-116m range while royalties fall as guided. Would invalidate — Microchip December-quarter bookings turning below 1.0 book-to-bill, or distributor inventory rebuilding past 30 days. Watch next — Everspin's CXL-attached MRAM demonstration at the SNIA developer conference, 28-30 September 2026. Valuation — Rambus 16.6x trailing gross profit and 15.2x forward, against roughly 28.0x in May; Microchip 13.6x and 11.2x.