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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.


* 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 See Profile) 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 See Profile, RuggeR See Profile) 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 See Profile from this post) ECC DDR266/333/400 DDR. Kingston do a 512MB upgrade - KCS-D2800/512

* 3825/45 - (provided by kamikatze See Profile) 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 See Profile
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 See Profile and kamikatze See Profile from this post)
HP 2GB PC2-5300 CL5 DDR2-667 ECC UDIMM RAM Module - Part Number PC2-5300E-555-12-G0
Kingston ValueRAM
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 See Profile) 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

»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:
  • And 2801 also uses sodimm pc133 ram, like the 1841 does, I tested various makes in 128 and 256Mb and they all worked in the 2801 In the 2811 I tested both ECC and nonECC that worked Samsung 256mb DDR PC2100 CL2.5 ECC (pc2100u-25331-a1)(cn0510) Samsung 512Mb DDR PC2700 CL2.5 (pc2700u-25331-z)(cn0452) Ofcourse u can't run non ECC and ECC in the same device

    2013-05-04 15:51:28

  • Just to let u know that non ecc ram DOES work in the 2811, I put in mine

    2013-05-04 15:40:18

  • Just wanted to confirm that Samsung 512MB PC2-4200S-444-12-A3 is indeed compatible with the Cisco 881. Figured I'd take the gamble and bought a stick off ebay and it worked! I'll take a $10 upgrade over a $150 upgrade anyday.

    2012-12-31 19:57:35 (RuggeR See Profile)

Expand got feedback?

by aryoba See Profile
last modified: 2014-08-14 20:14:53