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 Cisco C2921-CME-SRST/K9 2921 Integrated Services Router US $3,249.93 
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 Cisco CISCO2901-SEC/K9 2901 Integrated Services Router US $1,785.54
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 Cisco CISCO2901/K9 2901 Integrated Services Router US $1,215.44
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 Netgear FVS318G-100NAS ProSafe FVS318G Firewall US $143.79
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 Cisco 512MB DDR SDRAM Memory Module US $2,399.91
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 Cisco ASA5520-MEM-2GB= RAM Module - 2 GB ( -SDRAM US $422.70
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 HP MSR30-40 A-MSR30-40 Multi-Service Router JF229A - NEW IN BOX HP WARRANTY US $1,399.99
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 Cisco 2821 Gigabit Wired Router (CISCO2821) US $799.00
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 Cisco CCENT CCNA Home Lab Kit for Certification Exams US $409.00
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 Cisco 2851 Wired Router w/ AC PWR, 2GE, 4HWICs, 3PVDM US $2,000.00
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 Cisco 2851 Wired Router w/ VWIC2-2MFT-T1/E1 card US $2,100.00
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 NEW H3C 0231A21X Router 6000 Router Processing Unit 2 US $1,425.00
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Memory question?
My computer uses 184-pin DDR SDRAM memory. The mother board documentation talks about single-sided & double-sided memory modules. Two single-sided modules will operate at DDR400 but two double-side modules only get DDR333. What's the difference between single & double sided? I'm looking to upgrade memory and I haven't seen any of the vendors specify single or double sided.
When referring to RAM modules, the terms take on a less literal meaning. "Single sided" refers to a RAM expansion with a single "bank" of chips, which the computer can access all at once. The physical expansion card may have chips on both of its sides, or only on one side, but is considered to be single sided because the computer can "see" all of its memory at once.
"Double sided" RAM has its chips divided into two sides (called "banks"), only one of which can be seen at a time by the computer. Initially, these were created by essentially attaching two single-sided SIMM cards to the same PCB, but more modern chips use different wiring. Pins 33 and 45 on the board are used by double-sided memory, and can sometimes be an indicator as to whether a given module is single or double-sided. To use the second half of the storage available, the computer must switch to the second bank, and can no longer read or write to the first half until it switches back again.
Higher-end computer systems may wish to avoid using double-sided memory because of the reduced performance that results from the time needed to switch banks, however it is not a noticeable decrease for the majority of personal uses.
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PNY 4GB DDR3 SDRAM Memory Module
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