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240-pin FB-DIMM (Fully Buffered DIMM)
A DIMM, or dual in-line memory module, comprises a series of dynamic random access memory integrated circuits (DRAM chips). These modules are mounted on a printed circuit board and designed for use in personal computers, workstations and servers.
240-pin fully buffered DIMMs (FBDIMMs) are used to provide DDR2 SDRAM memory for servers and motherboards that use FBDIMM technology, as opposed to conventional registered DIMM (RDIMM) technology.
Fully Buffered DIMM architecture introduces an Advanced Memory Buffer (AMB) between the memory controller and the memory module. Unlike the parallel bus architecture of traditional DRAMs, an FB-DIMM has a serial interface between the memory controller and the AMB. This enables an increase to the width of the memory without increasing the pin count of the memory controller beyond a feasible level. With this architecture, the memory controller does not write to the memory module directly; rather it is done via the AMB. The AMB can thus compensate for signal deterioration by buffering and resending the signal.
To use fully buffered DIMMs, your server or motherboard must use FBDIMM architecture. An FB-DIMM will not fit into a standard DDR2 socket, and a DDR2 module will not fit into an FB-DIMM socket.
The number of black components (DRAM chips) on a 240-pin DIMM can vary,and generally the chips will be obscured by the heat-spreader applied to both sides of the module. It always has 120 pins on the front and 120 pins on the back, for a total of 240. 240-pin FB-DIMMs are typically 5.25 inches long and 1.25 inches high, but differ from other DDR DIMMs by having indents on both ends within the slot.
RamCity acknowledges the contributors to the Wikipedia article Fully Buffered DIMM. Some of the text from that article has been reproduced here.
Specifications
| Form Factor | 240-pin FB-DIMM |
|---|---|
| CAS Latency | CL5 |
| Configuration | 36-chip 256Mx4 |
| Voltage | 1.8V |
| ECC | ECC |
| Registered / Buffered | Fully Buffered |
| Speed | DDR2-800 / PC2-6400 |
| Ranks | Dual Rank |
| Brand | RamCity |
| Size | 8GB |
| Pieces in Kit | 2 |
| OEM Part No | MB092G/A (Apple) |
Free Shipping, Payment, Returns and Replacements
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Free Shipping and Delivery
- FREE Shipping
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- Delivery times for Kingston products are usually overnight. For RamCity brand products delivery can take 1-3 business days.1 All deliveries are made Monday to Friday 8am-5pm, excluding public holidays.
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- Orders for Kingston products ship direct from our supplier in Auckland.
- IMPORTANT: Orders of non-Kingston brand products (such as RamCity, Micron, Samsung, Hynix, etc), or orders with both Kingston and non-Kingston products combined, will ship from our Sydney distribution centre. Regardless of the order value, RamCity pay all applicable import duties and taxes on your behalf, so there is nothing more for you to pay!
1. In rural or remote areas, please allow an extra 2 business days.
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Frequently Asked Questions
Upgrading Memory
- Do I have to install the memory in pairs (dual channel)?
- What do the different Memory speeds mean?
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- How much memory do I need for Windows Vista or Windows 7?
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Quality and Compatibility
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