For your all server memory

Server Memory

Server memory is different from regular computer memory in that it has various additional features that are required by a server. Memory for computers is usually much cheaper than Server memory; However you can buy used server memory that is priced much cheaper than brand new RAM.
Server memory can be broken down into fully buffered dimm  also known as fb dimm for short and ECC registered memory or ECC memory.  Generally fully buffered dimm memory is also error correcting (ECC)

Fully Buffered Dimm Server Memory

Fb dimm server memory is a little slower than the comparable speed non-fully buffered Dimm since it has an advanced memory buffer also called AMB that in on the dimm memory module. The AMB acts on behalf of the memory controller and writes to the memory module, this takes away the system overhead on the CPU or memory controller the happened with traditional non-fb dimm ECC memory and increases performance.  

ECC Registered Server Memory

While FB Dimm memory is more common in the latest server memory system architecture found on new server motherboards, many data servers and workstations still use ECC registered memory.  Error-correcting memory (ECC memory for short) provides some additional redundancy for mission critical servers but it does add more overhead to the processor and the memory controller.
Find some great pricing on FB Dimm server memory below.

IBM Memory and Drives

IBM Server Memory. For Thinkpad and ThinkCentre memory, please visit the Lenovo-IBM memory section.

MemoryTen specializes in providing 100% reliable IBM memory upgrades for all IBM applications. MemoryTen inventories IBM original memory for all IBM servers and workstations such as iSeries, pSeries, xSeries, PowerPC, BladeCenter, RS/6000 and Lenovo-IBM. Lenovo-IBM memory, Thinkpad and Thinkcentre memory can be found in the Lenovo-IBM memory section. MemoryTen also has third party memory alternatives for every IBM system. We grant universities, schools and government agencies 30 days terms with a purchase order faxed to 408-588-1236. Government agencies may also purchase memory through our GSA contract. IBM - Lenovo Memory for Desktop and Notebook Memory

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Lenovo-IBM Memory and Drives IBM Memory and Drives - Lenovo 3000 Desktop Series - Lenovo 3000 Notebook Series - Lenovo AMBRA Series - Lenovo Aptiva Series Memory and Drives AS/400 Memory AS/400 Server 170 #2289 - AS/400 Server 170 #2290 - AS/400 Server 170 #2291 - AS/400 Server 170 #2292 - AS/400 Server 170 #2385 BladeCenter Series Memory and Drives BladeCenter HC10 7996 - BladeCenter HS12 (1916, 8014, 8028-xxx) - BladeCenter HS20 (7981-xFU) - BladeCenter HS20 (Type 8678) - BladeCenter HS21 (1885) Computer Telephony Server Computer Telephony Server 7563 Passive Backplane System - Computer Telephony Server 7587 - Computer Telephony Server 7588 -  eServer iSeries Memory and Drives eServer i5 520 - eServer i5 520 Express - eServer i5 550 (9113-550) - eServer i5 550 (9406-xxx) - eServer i5 570 eServer pSeries Memory and Drives eServer pSeries 600 Series - eServer pSeries p5 Series -  eServer xSeries Memory and Drives eServer xSeries 100 Series - eServer xSeries 200 Series - eServer xSeries 300 Series - eServer xSeries 400 Series - eServer xSeries BladeCenter Series eServer OpenPower Memory and Drives eServer OpenPower 710 - eServer OpenPower 710 Express - eServer OpenPower 720 - eServer OpenPower 720 Express -  IntelliStation Memory and Drives IntelliStation A Pro Series - IntelliStation E Pro Series - IntelliStation M Pro Series - IntelliStation POWER Series - IntelliStation R Pro Series Kiosk Kiosk 15W - Kiosk 153 - Kiosk 4835-120 - Kiosk 4835-150 - Kiosk 4835-152 Netfinity Netfinity 3000 Series - Netfinity 3500 Series - Netfinity 5000 Series - Netfinity 5100 Series - Netfinity 5500 Series Network Station Network Station 100 (8361-100)  - Network Station 200  - Network Station 300 Desktop - Network Station 300 91H0-550 - Network Station 300 8361 Series Nways Multiprotocol Router 2210 Nways Multiprotocol Router 12x - 2210 Nways Multiprotocol Router x4x -  PC i486DX 6472-Hxx - i486DX2 6472-Lxx - PC 100 Series Model (6271-xxx) - PC 100 Series Model (6281-xxx) - PC 140 Series Model (6220-xxx) PC 300 Series Memory and Drives PC 300 (6344-1xx) - PC 300 (6344-2xx) - PC 300 (6344-3xx) - PC 300 (6344-4xx) - PC 300 (6344-5xx) PC 365 Series Memory and Drives PC 365 S180 6589-10U - PC 365 S180 6589-11U - PC 365 S180 6589-17U - PC 365 S200 6589-12U - PC 365 S200 6589-13U PC 700 Series Memory and Drives PC 700 Series Model 166/66 - PC 700 Series Model 720 (6863-JA7) - PC 700 Series Model 730 - PC 700 Series Model 750 - PC 700 Series 6875 PC 800 Series Memory and Drives PC 830 6050 - PC 830 6070 - PC 850 6070 -  PC Server PC Server 300 Series  - PC Server 700 Series - PC Server 500 Series  - PC Server 8600 Series -  Power Series Power 520 Express Model M15 (9408-M15) - Power 520 Express Model M25 (9408-M25) - Power 550 Express Model M50 (9409-M50) - Power Series 800 Model 830 - Power Series 800 Model 850 Premier Series Memory and Drives PS/1 Series - PS/2 Series  - Premier PS/2 9556 Model 56 0B6 - Premier PS/2 9556 Model 56 0BA - Premier PS/2 9556 Model 56 DB6 Printer Series InfoPrint Series - LaserPrinter Series - Network Printer - PS 4079 Color JetPrinter -  PS/Note Series PS/Note 182  - PS/Note 2133-13T - PS/Note 2133-16E - PS/NOTE 2133-18A - PS/NOTE 2133-451 PS/ValuePoint Series PS/ValuePoint 6381 Series - PS/ValuePoint 6382 Series  - PS/ValuePoint 6384 Series  - PS/ValuePoint 6387 Series - PS/ValuePoint 433DX Model RS/6000 POWERstation/POWERserver Series Memory and Drives RS/6000 POWERserver 730  - RS/6000 POWERserver 930  - RS/6000 POWERserver 950  - RS/6000 POWERstation/POWERserver 3AT  - RS/6000 POWERstation/POWERserver 3BT RS/6000 Server RISC System 6000/Model 595 - RISC System 6000/Model F20 - RISC System 6000/Model F85 - RISC System 6000/Model S7A - RISC System 6000/Model S70 SuperOne Series Memory and Drives SuperOne 4614-101 - SuperOne 4614-102 -  SureOne Series Memory and Drives SureOne 33H - SureOne 330 - SureOne 4614-101 - SureOne 4614-102 - SureOne 4614-111 SurePOS Series Memory and Drives SurePOS 30 Series - SurePOS 300 Series - SurePOS 500 Series - SurePOS 600 Series - SurePOS 700 Series System P5 Series Memory and Drives System p5 185 Express - System p5 185 Server (7037-xxx) - System p5 505 Express (9115-505) - System p5 505Q Express 9115 505 - System p5 510 Express (9110-51A) System x Series Memory and Drives System x3100 (4348-xxx) - System x3105 (4347, 4437-xxx) - System x3200 (4262-xxx) - System x3200 (4263-xxx) - System x3200 (4264-xxx) Total Storage Series Total Storage Master Console Rack - Total Storage NAS 200 5194-25T - Total Storage NAS 300 (5196) - Total Storage NAS 500 (5198) -  Valuepoint Valuepoint P60/D 6384 1A3 - Valuepoint P60/D 6384 1A9 - Valuepoint P60/D 6384 189 - Valuepoint P60/D 6384 193 - Valuepoint P60/D 6384 199 WorkPad Series WorkPad C500 - WorkPad C505 - WorkPad Companion 30X - WorkPad Companion 40U - WorkPad z50 Series Xstation Xstation 120 - Xstation 130 - Xstation 140 - Xstation 150 - Xstation 160 System p6 520 (8203-E4A) (1-core processor card) 1GB (2x512MB) IBM Power 520/550 Express DDR2-667 Chipkill Memory Kit (p/n 4520-MT) - 2GB (2x1GB) IBM Power 520/550 Express DDR2-667 Chipkill Memory Kit(p/n 4521-MT) - IBM 4522, 4GB (2x2GB) IBM Power 520/550 Express DDR2-667 Chipkill Memory Kit (p/n 4522-MT) -  System p6 550 (8204-E8A) 1GB (2x512MB) Original IBM System X DDR2-667 Chipkill Memory Kit (p/n 41Y2759) - IBM 41Y2759, 1GB (2x512MB) IBM 3rd. party System X DDR2-667 Chipkill Memory Kit (p/n 41Y2759-MT) - IBM 41Y2762, 2GB (2x1GB) System X DDR2-667 Chipkill Memory Kit (p/n 41Y2762-MT) - 4GB (2x2GB) IBM System X DDR2-667 Chipkill Memory Kit (p/n 41Y2765-MT) - IBM 41Y2768, 8GB (2x4GB) IBM Original System X PC2-5300 DDR2-667 ECC Registered Memory Kit (p/n 41Y2768) System z9 109 IBM 15R8508, 8GB IBM 276-pin PC2-3200 Registered ECC DDR2-400 DIMM (p/n 15R8508) $749.98