DRAM Spot Cools at the Margin as HBM3E Contracts Jump 20% and DDR5 Defies Substitution

The memory spot market is cooling at the edges without loosening the cycle. TrendForce's weekly update for the week of 15 September said quote inquiries for DDR5 chips from major suppliers slowed and prices for certain chips began to soften, while branded DDR4 2Gx8 parts saw more pronounced corrections and no clear buying interest emerged to absorb available supply. The average spot price of mainstream DDR4 1Gx8 3200MT/s still rose 0.47% to $45.54 from $45.32 a week earlier, and reballed chips extended gains on consumer-electronics demand against limited inventory. On TrendForce's price board, DDR5 16Gb (2Gx8) 4800/5600 averaged $56.00 on 18 September against a session high of $67.00, up 1.39%, while DDR4 16Gb 3200 averaged $85.75, down 0.29%.

NAND is the weaker leg. Consumer end demand remains sluggish and spot prices are range-bound, with suppliers loosening quotations and widening negotiation room to move volume while buyers stay on the sidelines. 512Gb TLC wafers fell 0.31% to $20.083 in the week to 14 September and overall transactions continued to wither. That contrasts with the contract side, where TrendForce had guided conventional DRAM up 13% to 18% quarter on quarter in the third quarter of 2026, server DRAM up the same 13% to 18%, and NAND Flash up 10% to 15%, with PC DRAM contract increases expected to moderate to 3% to 8% in the fourth quarter as buyers hit price ceilings.

HBM remains the structural driver. Samsung and SK hynix raised HBM3E 2026 contract prices by roughly 20% versus prior-year agreements, an unusual move for a category normally governed by stable long-term agreements, while server DRAM contract prices had already surged 90% to 95% quarter on quarter in the first quarter of 2026 and 58% to 63% in the second before moderating to the 13% to 18% third-quarter pace. HBM4 mass production began ramping across all three major suppliers in the first half of 2026, but HBM4 pricing is tracking upward alongside HBM3E, offering no near-term relief for accelerator bill-of-materials costs. TrendForce projects HBM reaching about 30% of DRAM wafer input by the end of 2027.

For buyers the practical read is that relief is slowing increases rather than reversing them. TrendForce has said contract prices are already at record highs and PC and smartphone customers are approaching the limit of what they will pay, which is expected to moderate PC DRAM contract rises to 3% to 8% in the fourth quarter rather than turn them negative. At the same time, the reallocation of wafer capacity toward HBM and server DRAM keeps conventional DRAM supply tight by construction, and server DRAM is expected to stay undersupplied into 2027. Every wafer committed to an AI accelerator is a wafer not making the ordinary memory that goes into a laptop, a phone or a desktop module.