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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 | 18-chip 128M x8 |
| Voltage | 1.8V |
| ECC | ECC |
| Registered / Buffered | Fully Buffered |
| Speed | DDR2-667 / PC2-5300 |
| Brand | RamCity |
| Heatsink | Apple Specified Heatsink |
| Size | 8GB |
| Pieces in Kit | 4 |
| OEM Part No | 2: MA987 (Apple) |
Free Shipping, Payment, Returns and Replacements
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Free Shipping and Delivery
- FREE Shipping
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- All Kingston brand products are shipped directly from our supplier in Auckland via NZ Couriers or CourierPost.
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- Delivery times for Kingston products are usually overnight. For RamCity brand products delivery typically takes 2-3 business days.1 All deliveries are made Monday to Friday 8am-5pm, excluding public holidays.
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- Full details of our comprehensive and convenient return policy are here. Back to the top ↑
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- Stock levels shown on our website are updated early each morning.
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- Products requiring back order are marked 'Ships in xx Days'.
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- If your product is not in stock, then we will back order it with our usual weekly stock order (if it's a RamCity brand product), or order it immediately from our suppliers. Generally it takes around 7 days to fill back orders, although some hard-to-get items may take longer. We will notify you of any unexpected delays.
- Although your credit card is charged up-front, you are able to cancel the order at anytime and have the transaction reversed. We do not charge any cancellation or restocking fees.
- GST and Import Duties
- All prices quoted on RamCity.co.nz are exclusive of GST.
- As we are an Australian company trading in New Zealand we are currently not required to collect GST.
- Orders for Kingston products ship direct from our supplier in Auckland, so import duties can never apply, regardless of order size.
- 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. GST and import duties may be leviable if the value of the order exceeds NZD$400. Read more about this on the NZ IRD website
- If any duty or taxes are applicable, then NZ Customs or the shipping carrier will contact you.
1. In rural or remote areas, please allow an extra 2 business days.
Payment Options and Pricing
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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?
- Your site shows many different memory upgrade options for my computer - which is the best?
- What if I don't know my computer/motherboard brand and model, and how do I find out the configuration of the currently installed memory modules?
- Will my system recognise the maximum RAM upgrade?
- Will adding more memory make my computer go faster?
- How much memory do I need for Windows Vista or Windows 7?
- Can I still upgrade the memory in my computer if it is old or not well known?
- My computer accepts two or more different speeds of memory (ex: PC2100, PC2700, and PC3200), which one should I buy?
Quality and Compatibility
- Are RamCity upgrades guaranteed compatible with my existing memory?
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- Why is RamCity brand memory sometimes much lower in price than Kingston?
- Who is Kingston Technology?
- Will installing a Memory upgrade from RamCity affect my original manufacturer warranty?
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