Conference Call:

The Company will host a conference call at 2:00 p.m. PT today to discuss its financial results. The call, audio and slides will be available online at investor.rambus.com. A replay will be available following the call on the Rambus Investor Relations website or for one week at the following numbers: (855) 859-2056 (domestic) or (404) 537-3406 (international) with ID#22388776.

(1) Non-GAAP Financial Information:

In the commentary set forth above and in the financial statements included in this earnings release, the Company presents the following non-GAAP financial measures: operating costs and expenses, operating income (loss) and net income (loss). In computing each of these non-GAAP financial measures, the following items were considered: stock-based compensation expenses, acquisition-related transaction costs and retention bonus expense, amortization expenses, costs of restatement and related legal activities, restructuring charges, impairment charges, severance costs, non-cash interest expense and certain other one-time adjustments. The non-GAAP financial measures disclosed by the Company should not be considered a substitute for, or superior to, financial measures calculated in accordance with GAAP, and the financial results calculated in accordance with GAAP and reconciliations from these results should be carefully evaluated. Management believes the non-GAAP financial measures are appropriate for both its own assessment of, and to show investors, how the Company’s performance compares to other periods. The non-GAAP financial measures used by the Company may be calculated differently from, and therefore may not be comparable to, similarly titled measures used by other companies. Reconciliation from GAAP to non-GAAP results is included in the financial statements contained in this release.

The Company’s non-GAAP financial measures reflect adjustments based on the following items:

Stock-based compensation expense. These expenses primarily relate to employee stock options, employee stock purchase plans, and employee non-vested equity stock and non-vested stock units. The Company excludes stock-based compensation expense from its non-GAAP measures primarily because they are non-cash expenses that the Company does not believe are reflective of ongoing operating results. Additionally, given the fact that other companies may grant different amounts and types of equity awards and may use different option valuation assumptions, excluding stock-based compensation expense permits more accurate comparisons of the Company’s results with peer companies.

Acquisition-related transaction costs and retention bonus expense. These expenses include all direct costs of certain acquisitions and the current periods’ portion of any retention bonus expense associated with the acquisitions. The Company excludes these expenses in order to provide better comparability between periods.

Restructuring charges. These charges may consist of severance, contractual retention payments, exit costs and other charges and are excluded because such charges are not directly related to ongoing business results and do not reflect expected future operating expenses.

Impairment of goodwill and long-lived assets. These charges consist of non-cash charges to goodwill and long-lived assets and are excluded because such charges are non-recurring and do not reduce the Company’s liquidity.

Amortization expense. The Company incurs expenses for the amortization of intangible assets acquired in acquisitions. The Company excludes these items because these expenses are not reflective of ongoing operating results in the period incurred. These amounts arise from the Company’s prior acquisitions and have no direct correlation to the core operation of the Company’s business.

Costs of restatement and related legal activities. These expenses consist primarily of investigation, audit, legal and other professional fees related to the 2006-2007 stock option investigation and related litigation, as well as recoveries received from third parties. The Company excludes these costs and recoveries from its non-GAAP measures primarily because the Company believes that these non-recurring costs and recoveries have no direct correlation to the core operation of the Company’s business.

Non-cash interest expense. The Company incurs non-cash interest expense related to its convertible notes. The Company excludes non-cash interest expense related to its convertible notes to provide more accurate comparisons of the Company’s results with other peer companies and to more accurately reflect the Company’s ongoing operations.

Reversal of one-time litigation costs. These adjustments are a one-time litigation cost reversal of prior litigation costs accrued related to previously awarded costs that the Company was required to pay in connection with the SK hynix and Micron Technology litigation. The Company excludes these reversals from its non-GAAP measures because the Company believes that these reversals have no direct correlation to the core operations of the Company’s business and they are a one-time event.

Severance costs. These expenses relate to the separation payment to the Company’s former chief executive officer. The Company excludes these costs from its non-GAAP measures because the Company believes that these non-recurring costs have no direct correlation to the core operations of the Company’s business.

Income tax adjustments. For purposes of internal forecasting, planning and analyzing future periods that assumes net income from operations, the Company estimates a fixed, long-term projected tax rate of approximately 36 percent. Accordingly, the Company has applied the 36 percent tax rate to its non-GAAP financial results to assist the Company’s planning for future periods.