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Router From my experiences, the following router model share the similar memory chip specification. Therefore, most of the time memory chip from one model is interchangeable with another. 1. DRAM * 800 series prior to 850/870 series; SOHO 90 series; 1700 series; 2600XM series; 2650 & 2651 - 100 Pin DIMM, SDRAM, 125MHz/133MHz, Unbuffered, Non-parity, 8ns, 3.3V, 16Meg x 32 * 800 series: 870 series - (provided by bigsy ) 168 pin DIMM low-profile CL3 non-ECC PC 133, i.e. Kingston KVR133X64C3L/128 works (full specification is clickable here), modules that are not low profile will not fit in the case correctly * 800 ISR series: 880 series - (provided by jmbronk , RuggeR ) 512MB PC2 4200 SODIMM, i.e. Samsung PC2-4200S-444-12-A and Samsung 512MB PC2-4200S-444-12-A3 work * 2600 series (excluding XM models and the 2650, 2651, and 2691) - 100 Pin DIMM, EDO, 60ns * All 1800 routers EXCEPT 1841 - 200 Pin SODIMM, SDRAM, 266MHz DDR, Non-ECC CL2.5 e.g. Kingston KVR266X64SC25/256 * 1841 - 144 Pin SODIMM, SDRAM, 133MHz, Non-ECC CL3 e.g. Kingston KVR133X64SC3/256 * 2811/21/51 - (provided by kamikatze from this post) ECC DDR266/333/400 DDR. Kingston do a 512MB upgrade - KCS-D2800/512 * 3825/45 - (provided by kamikatze ) DDR333 or higher with ECC and at least CL2.5 (@333MHz). Kingston do 256MB & 512MB upgrades - KCS-D3825/256 & KCS-D3825/512 Note from cramer Cisco 3845: ECC, DDR333 (PC2700) ONLY System only supports 166Mhz DDRs /PC3200 DIMMs DRAM: Non ECC memory not supported !! DRAM: DIMM0, invalid Module Data Width of 64 (non-ECC DIMMs) DRAM: DIMM 0 width not supported - 4 DRAM: DIMM1 width not supported - 4 (1G DIMMs) * 2900 - (provided by Brainbug and kamikatze from this post) HP 2GB PC2-5300 CL5 DDR2-667 ECC UDIMM RAM Module - Part Number PC2-5300E-555-12-G0 Kingston ValueRAM KVR667D2E5/2G 2GB 256M x 72-Bit DDR2-667 CL5 ECC 240-Pin DIMM 2. Flash * 800, 820 * 2500; 2600 (2610, 2611, 2612, 2613, 2620, 2621, 2650, 2651); 3600; 4000 (4000/4000M, 4500/4500M, 4700/4700M) * All 2600XM models 3. Compact Flash and USB Flash Newer routers, (modular) switches, and firewalls that use Compact Flash instead of legacy Flash memory chips are able to share at least 16 MB size. With newer ROMMON version (upgradable), 32 MB size or larger are also interchangeable. This category includes 1800, 2800, 3700, 3800, 2900, 3900, and ASR series (routers); Catalyst 4500, 6500 series (switches); ASA 1st Generations and X models (2nd Generations) Further Info For more info, check out the following Cisco link. Cisco 1700 series Cisco 2600 and 2600XM series ASA 5500 ASA5505 DRAM: (provided by bigsy ) 184 pin PC3200 DIMM CL3 UB Non-ECC i.e. Kingston KVR400X64C3A/512 works (full specification is clickable here), MAX 512MB ASA5505 Flash: CompactFlash (512MB SanDisk works) Some discussions »I'm back! ASA 5510 / 2GB RAM / 2.8Ghz Proc »If you've ever wondered.. probably not.. »[H/W] Anyone out there with an 891? »[Info] Recommended 1811 3rd party ram »ASA 5500 Series 8.3(x) Memory Requirements »[H/W] 881W ISR RAM Upgrades »Cisco 5520 ASA Memory »[H/W] RAM for a 2650XM Feedback received on this FAQ entry:
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