AMD reported revenue of $508m for the quarter ended 29 September, a decline of 34% year on year, and posted a net loss of $254m.
Transmeta generated $6.4m in revenue for its third quarter ending 27 September, compared with $5m in revenue for the same quarter last year. It posted a net loss of $21.8m.
Both companies cited weak demand for consumer PCs as the primary reason for the fall.
The figures for AMD and Transmeta are both based on generally accepted accounting principles (GAAP).
The results followed on the heels of market leader Intel's third quarter report, which was issued on Tuesday. Intel came in below analyst expectations, which sent the company's stock reeling in Wednesday's trading on the Nasdaq exchange.