![CMS 4GB (1X4GB) DDR2 6400 800MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with HP/Compaq® Business Desktop Dc7900 Ultra Slim Desktop - A42 at Amazon.com CMS 4GB (1X4GB) DDR2 6400 800MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with HP/Compaq® Business Desktop Dc7900 Ultra Slim Desktop - A42 at Amazon.com](https://m.media-amazon.com/images/I/61EHK0f0d5L._AC_UF894,1000_QL80_.jpg)
CMS 4GB (1X4GB) DDR2 6400 800MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with HP/Compaq® Business Desktop Dc7900 Ultra Slim Desktop - A42 at Amazon.com
![Specs HP Compaq dc7900 Ultra-slim Desktop PC (ENERGY STAR) E8400 Intel® Core™2 Duo 2 GB DDR2-SDRAM 160 GB Windows Vista Business PCs/Workstations (FS489AW#ABH) Specs HP Compaq dc7900 Ultra-slim Desktop PC (ENERGY STAR) E8400 Intel® Core™2 Duo 2 GB DDR2-SDRAM 160 GB Windows Vista Business PCs/Workstations (FS489AW#ABH)](https://images.icecat.biz/img/norm/high/1690791-HP.jpg)
Specs HP Compaq dc7900 Ultra-slim Desktop PC (ENERGY STAR) E8400 Intel® Core™2 Duo 2 GB DDR2-SDRAM 160 GB Windows Vista Business PCs/Workstations (FS489AW#ABH)
![Amazon.com: PK Power AC/DC Adapter Compatible with HP Compaq DC7900 USDT Ultra-Slim Desktop PC Power Supply Cord Cable Charger Mains PSU : Electronics Amazon.com: PK Power AC/DC Adapter Compatible with HP Compaq DC7900 USDT Ultra-Slim Desktop PC Power Supply Cord Cable Charger Mains PSU : Electronics](https://m.media-amazon.com/images/I/51v1UnE9XNL._AC_UF894,1000_QL80_.jpg)
Amazon.com: PK Power AC/DC Adapter Compatible with HP Compaq DC7900 USDT Ultra-Slim Desktop PC Power Supply Cord Cable Charger Mains PSU : Electronics
![The 3rd and final upgrade to my trusty 15 yr old HP DC7900 ultra slim desktop. With a core 2 duo E8400, 4GB DDR2 and an 80GB 7200rpm hdd (original died, it The 3rd and final upgrade to my trusty 15 yr old HP DC7900 ultra slim desktop. With a core 2 duo E8400, 4GB DDR2 and an 80GB 7200rpm hdd (original died, it](https://external-preview.redd.it/2RRABEYDp-V3wVrPr6WYGKE52CvZyELHcaNU-Qcplno.jpg?width=640&crop=smart&auto=webp&s=2bdf1087507ca6496ce74b4e3458c21f32a86129)
The 3rd and final upgrade to my trusty 15 yr old HP DC7900 ultra slim desktop. With a core 2 duo E8400, 4GB DDR2 and an 80GB 7200rpm hdd (original died, it
![UPBRIGHT HP 19V / 19.5V 6.9A / 7.1A 135W Adapter For HP Compaq dc7900 Ultra-slim Desktop KP722AV FS489AW#ABA KR671UT#ABA Charger - Walmart.com UPBRIGHT HP 19V / 19.5V 6.9A / 7.1A 135W Adapter For HP Compaq dc7900 Ultra-slim Desktop KP722AV FS489AW#ABA KR671UT#ABA Charger - Walmart.com](https://i5.walmartimages.com/asr/509c9dda-c46e-4b87-9265-0c81322aeb23.7af464bc8748777789f55d5e20315500.jpeg?odnHeight=612&odnWidth=612&odnBg=FFFFFF)