256MB KIT (2 x 128MB) For IBM-Lenovo Thinkpad Notebook Series 390 390E (2645-21X) (2645-31X) (2645-35X) (2645-41X) (2645-xxx) 600E (2645-xxx) 770 (9548-xxx) 770 (9549-xxx) 770E/ED (4548-xxx) 770E/ED (4549-xxx) 770X (9549-7xU) 770Z (9549-8xU) 1400 (2611-xxx) 1400 (2621-427) 1400 (2621-441) 1400 (2621-447) 1400 (2621-448) 1400 (2621-467) 1400 (2621-487) 1400 (2621-xxx) 1400 (All Models) 1410 1411 1412 1420. SO-DIMM SD NON-ECC PC66 66MHz RAM Memory. Genuine A-Tech Brand. 256MB KIT (2 x 128MB) SO-DIMM SD NON-ECC PC66 66MHz RAM Memory Genuine A-Tech Memory Lifetime Warranty Toll Free Technical Support 1-866-557-4527 Designed For IBM-Lenovo Thinkpad Notebook Series. (See Compatibility List Below)