ASTER RACKIT — ITEM RFQ DRAFT Not an offer, order, stock allocation or OEM-approved BOM. Identifier: 4X77B09643 Manufacturer: Lenovo Product family: ThinkSystem Memory RECORDED ENGLISH DESCRIPTION Lenovo 4X77B09643 is a documented OEM memory option in the ThinkSystem Memory portfolio. Its ordering row records 64GB DRAM module RDIMM-A. Prepare an ASTER RACKIT enquiry using the complete PN, required quantity and destination system. Confirm module labels, supported population and effective operating speed before selection. Record type: oem-option-part-number URL: https://www.aster-rackit.com/explore/product/lenovo-4x77b09643-f8e5c99a38 Quantity: [enter] Condition: [confirm] Destination: [enter] RECORDED TECHNICAL FIELDS — CHECK EVIDENCE STATUS Full OEM ordering PN: 4X77B09643 [oem_catalog_observed] — Literal official ordering-table observation. Actual supplied assembly, firmware and current lifecycle are not verified. | Location: /html/body/div[1]/div[4]/div/div/div/div[1]/div/div/div[2]/div[5]/div[5]/div[2]/table/tbody/tr[11]/td[1] Printed feature code: CBFR [oem_catalog_observed] — Literal official ordering-table observation. Actual supplied assembly, firmware and current lifecycle are not verified. | Location: /html/body/div[1]/div[4]/div/div/div/div[1]/div/div/div[2]/div[5]/div[5]/div[2]/table/tbody/tr[11]/td[2] Documented byte capacity: 64GB [oem_catalog_observed] — Literal ordering-row statement; actual supplied unit and effective operating speed unverified. | Location: /html/body/div[1]/div[4]/div/div/div/div[1]/div/div/div[2]/div[5]/div[5]/div[2]/table/tbody/tr[11]/td[3] Memory generation: TruDDR5 [oem_catalog_observed] — Literal ordering-row statement; actual supplied unit and effective operating speed unverified. | Location: /html/body/div[1]/div[4]/div/div/div/div[1]/div/div/div[2]/div[5]/div[5]/div[2]/table/tbody/tr[11]/td[3] Printed memory speed: 6400MT/s [oem_catalog_observed] — Literal ordering-row statement; actual supplied unit and effective operating speed unverified. | Location: /html/body/div[1]/div[4]/div/div/div/div[1]/div/div/div[2]/div[5]/div[5]/div[2]/table/tbody/tr[11]/td[3] Rank and organization: 2Rx4 [oem_catalog_observed] — Literal ordering-row statement; actual supplied unit and effective operating speed unverified. | Location: /html/body/div[1]/div[4]/div/div/div/div[1]/div/div/div[2]/div[5]/div[5]/div[2]/table/tbody/tr[11]/td[3] DRAM technology: 16Gb [oem_catalog_observed] — Documented OEM ordering column only. A supplier part reference is not an additional product, alias or certified equivalent. | Location: /html/body/div[1]/div[4]/div/div/div/div[1]/div/div/div[2]/div[5]/div[5]/div[2]/table/tbody/tr[11]/td[4] Official OEM product portfolio: ThinkSystem Memory [oem_catalog_observed] — Literal official ordering-row or own portfolio statement; actual supplied assembly and server configuration remain unverified. | Location: /html/body/div[1]/div[3]/div/div/div/div[2]/div/h1 Official ordering description: ThinkSystem SR635 V3/SR655 V3 64GB TruDDR5 6400MT/s (2Rx4) RDIMM-A v2 [oem_catalog_observed] — Literal official ordering-row or own portfolio statement; actual supplied assembly and server configuration remain unverified. | Location: /html/body/div[1]/div[4]/div/div/div/div[1]/div/div/div[2]/div[5]/div[5]/div[2]/table/tbody/tr[11]/td[3] Official ordering-table group: x4 RDIMMs - supported up to 6400 MHz [oem_catalog_observed] — Literal official ordering-row or own portfolio statement; actual supplied assembly and server configuration remain unverified. | Location: /html/body/div[1]/div[4]/div/div/div/div[1]/div/div/div[2]/div[5]/div[5]/div[2]/table/tbody/tr[6]/td Printed memory module type: RDIMM-A [oem_catalog_observed] — Literal official ordering-row or own portfolio statement; actual supplied assembly and server configuration remain unverified. | Location: /html/body/div[1]/div[4]/div/div/div/div[1]/div/div/div[2]/div[5]/div[5]/div[2]/table/tbody/tr[11]/td[3] Capacity: 64GB [unverified_inherited] Memory generation: TruDDR5 [unverified_inherited] Module type: RDIMM [unverified_inherited] Memory speed designation: 6400MHz [unverified_inherited] Rank and device organization: 2Rx4 [unverified_inherited] Title-derived · capacity / module size: 64GB [unverified_inherited] Title-derived · memory generation/type: RDIMM [unverified_inherited] Title-derived · memory speed: 6400MHz [unverified_inherited] Lenovo ordering part number: 4X77B09643 [oem_catalog_verified] — Check the complete option number, target system, tray, firmware and configuration before ordering. | Lenovo OEM ordering option; source specifications are not a tested inventory unit or an interchangeable manufacturer PN. | Document: LP1021; updated 29 Jul 2025 | Location: Table 4. 6400 MHz DDR5 memory for AMD servers; rendered line 205; exact Lenovo ordering option 4X77B09643 Identity type: OEM ordering option [oem_catalog_verified] — Check the complete option number, target system, tray, firmware and configuration before ordering. | Lenovo OEM ordering option; source specifications are not a tested inventory unit or an interchangeable manufacturer PN. | Document: LP1021; updated 29 Jul 2025 | Location: Table 4. 6400 MHz DDR5 memory for AMD servers; rendered line 205; exact Lenovo ordering option 4X77B09643 Documented product series: TruDDR5 [oem_catalog_verified] — Check the complete option number, target system, tray, firmware and configuration before ordering. | Lenovo OEM ordering option; source specifications are not a tested inventory unit or an interchangeable manufacturer PN. | Document: LP1021; updated 29 Jul 2025 | Location: Table 4. 6400 MHz DDR5 memory for AMD servers; rendered line 205; exact Lenovo option 4X77B09643 Listed nominal capacity: 64 GB [oem_catalog_verified] — Nominal capacity of this OEM option; usable formatted capacity can differ. | Lenovo OEM ordering option; source specifications are not a tested inventory unit or an interchangeable manufacturer PN. | Document: LP1021; updated 29 Jul 2025 | Location: Table 4. 6400 MHz DDR5 memory for AMD servers; rendered line 205; exact Lenovo ordering option 4X77B09643 Memory module type: RDIMM [oem_catalog_verified] — Check the complete option number, target system, tray, firmware and configuration before ordering. | Lenovo OEM ordering option; source specifications are not a tested inventory unit or an interchangeable manufacturer PN. | Document: LP1021; updated 29 Jul 2025 | Location: Table 4. 6400 MHz DDR5 memory for AMD servers; rendered line 205; exact Lenovo ordering option 4X77B09643 Memory interface generation: DDR5 [oem_catalog_verified] — Generation named in the exact OEM option row. | Lenovo OEM ordering option; source specifications are not a tested inventory unit or an interchangeable manufacturer PN. | Document: LP1021; updated 29 Jul 2025 | Location: Table 4. 6400 MHz DDR5 memory for AMD servers; rendered line 205; exact Lenovo ordering option 4X77B09643 Labelled memory rate: 6400 MT/s [oem_catalog_verified] — Source unit preserved. Labelled rate is not a guarantee of operating speed in every platform. x4 RDIMMs - supported up to 6400 MHz | Lenovo OEM ordering option; source specifications are not a tested inventory unit or an interchangeable manufacturer PN. | Document: LP1021; updated 29 Jul 2025 | Location: Table 4. 6400 MHz DDR5 memory for AMD servers; rendered line 205; exact Lenovo ordering option 4X77B09643 Supported rate in this table context: 6400 MHz [oem_catalog_verified] — Only applies to the processor/platform grouping in the cited table; it does not replace the labelled rate. | Lenovo OEM ordering option; source specifications are not a tested inventory unit or an interchangeable manufacturer PN. | Document: LP1021; updated 29 Jul 2025 | Location: Table 4. 6400 MHz DDR5 memory for AMD servers; group heading at rendered line 200 Rank and organization: 2Rx4 [oem_catalog_verified] — Check the complete option number, target system, tray, firmware and configuration before ordering. | Lenovo OEM ordering option; source specifications are not a tested inventory unit or an interchangeable manufacturer PN. | Document: LP1021; updated 29 Jul 2025 | Location: Table 4. 6400 MHz DDR5 memory for AMD servers; rendered line 205; exact Lenovo ordering option 4X77B09643 SOURCE REFERENCES Lenovo ThinkSystem Memory Summary: https://lenovopress.lenovo.com/lp1021-lenovo-thinksystem-memory-summary | Source type: OEM product guide [oem-product-guide] | retrievedAt: 2026-10-16T13:54:19.531Z | observedAt: 2026-10-16T13:54:19.531Z | Confidence: high | Status: OEM option number and individually documented fields; see scope and qualifiers Lenovo ThinkSystem Memory Summary: https://lenovopress.lenovo.com/lp1021-lenovo-thinksystem-memory-summary | Source type: OEM product guide [oem-product-guide] | accessedAt: 2026-10-20T23:18:46.081823+00:00 | retrievedAt: 2026-10-20T23:18:46.081823+00:00 | Confidence: official_literal_ordering_table_observed | Status: observed Lenovo ThinkSystem Memory Summary: https://lenovopress.lenovo.com/lp1021-lenovo-thinksystem-memory-summary | Source type: OEM product guide [oem-product-guide] | accessedAt: 2026-10-16T13:54:19.531Z | retrievedAt: 2026-10-16T13:54:19.531Z | observedAt: 2026-10-16T13:54:19.531Z | Confidence: high | Status: Documented OEM ordering option; not installed inventory or bare-component qualification Lenovo ThinkSystem Memory Summary: https://lenovopress.lenovo.com/lp1021-lenovo-thinksystem-memory-summary | Source type: OEM product guide [oem-product-guide] | retrievedAt: 2026-10-16T13:54:19.531Z | observedAt: 2026-10-16T13:54:19.531Z | Confidence: high PURCHASE CHECKS 1. Confirm the complete module number, capacity, DDR generation, buffer type and organization instead of matching capacity alone. 2. Use the platform population rules. The speed printed on a DIMM is not a promise of operating speed in every processor and slot combination. 3. List the modules already installed and the modules being added. Existing parts are part of the compatibility question, not an afterthought. 4. Confirm processor count, accessible slots and a growth target. A logical slot-count picture is not the OEM physical installation sequence. 5. Ask for module labels and a memory-test record that identifies the tested system and population. PHOTO / EVIDENCE REQUIREMENTS Module labels Connector and PCB condition Protective packaging Installed population list Test scope Confirm current exact identity, compatibility, stock, price, warranty and delivery terms with sales@aster-rackit.com.