NO, Only FB-DIMM can be used \
Yes, but take care to use non-ecc modules.
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It is more reliable.
If you need to use a server with memory error protection for such critique services like financing, computer simulations and so on. You have to use ECC (error correcting code) memory which supports memory error protection. More information you can find here http://en.wikipedia.org/wiki/ECC_memory#Error-correcting_memory
This is fully buffered RAM for servers as it is ECC Registered! It is also an FB DIM so will not fit in standard 240pin slots. An example of servers that use this are: HP Proliant DL360 G5 HP Proliant DL380 G5 Dell Poweredge 1950 Dell Poweredge 2900 Dell Poweredge 2950
It is more reliable and is generally used on servers.
You should use ECC memory because is uses an extra bit pre byte which is used for error checking and correctionn even though it is more cosly. Also, it is more reliable
Depending on the specs of the motherboard, a motherboard that supports ECC SDRAM may support a non-ECC SDRAM module. If a motherboard can support both types, you would have the option to enable or disable the ECC feature in BIOS. Other than the fact that an ECC module has an odd number of chips, there is no other physical difference on the module. They are keyed the same.
Memory Type: DDR2 PC2-6400, DDR2 PC2-8500, DDR2 (non-ECC)Maximum Memory: 8GBSlots: 4Each memory slot can hold DDR2 PC2-6400, DDR2 PC2-8500 with a maximum of 2GB per slot.
Because it is more reliable and is generally used on servers.
The Acer Aspire 3620 Notebook computer can use DDR2 PC2-4200 (DDR2-533) or DDR2 PC2-5300 (DDR2-667) which are 200-pin SODIMM modules. The Acer Aspire 3620 has two memory slots and each slot supports up to 1 Gigabyte of RAM for a total of 2 Gigabytes. This system uses unbuffered, Non-ECC, 1.8 Volt RAM.
This would depend on what you are looking to use the server for. If you are looking to use it for a VPS virtualizor, then it's a bit more complicated than just getting 24 GB ECC (DDR2, etc) RAM and sticking with it. You'd need more like 96 GB ECC (DDR2, etc) RAM and at least four hard drives with io disks. You would also need RAID and so much more. There is no definite explanation for this. Try contacting your datacenter that you want to go with. If you're home hosting it, then try contacting the company you are buying from.