Buffered RAM vs Unbuffered RAM???

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General Hardware Forum Discuss, Buffered RAM vs Unbuffered RAM??? at Computer Hardware forum; Well, look at my rig to see my RAM. I ran new sandra MAX3! and it gives as a tip that for large memory modules it is better to use Buffered RAM. However, when speaking with the ASUS tech, before deciding on my mainbord, I was told that the best

xtacydima (Moderator): Posts: 3,964; Posted: 20-08-2003

Well, look at my rig to see my RAM. I ran new sandra MAX3! and it gives as a tip that for large memory modules it is better to use Buffered RAM. However, when speaking with the ASUS tech, before deciding on my mainbord, I was told that the best mods to use on my board which I bought were Unbuffered Corsair. So who was right, and which is better?

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Antec P160 Case
Corsair CMPSU-850TX 850W ATX SLI Ready CrossFire Ready Active PFC
P4 3.0E GHz running WinXP w/SP2
Scythe SCMN-1000 Heatsink w/Arctic Silver 5
ASUS P4C800 Deluxe Motherboard
2GB RAM - Corsair XMS TWINX2048 (2x1GB) 3200C2Pro CL2.0
NVIDIA GeForce 6800 GT AGP
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WD Caviar Black WD7501AALS 750GB 7200 RPM 32MB Cache SATA 3.0Gb/s
WD Caviar Black WD7501AALS 750GB 7200 RPM 32MB Cache SATA 3.0Gb/s
Lite-On LTR-52246S 6S0F (IDE1 Master)
Lite-On JLMS XJ-HD166S DS1C (IDE1 Slave)
NEC 3500AG 2.TC Quiet (IDE2 Master)
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BadReligionPR (Retired Moderator): Posts: 1,222; Posted: 20-08-2003

Unless it's a server, go with unbuffered. On SDRAM (and it's offshoots) registering takes one clock cycle. Just so this makes sense, registered=buffered.

You said that the registers perform a "buffering" function. What does this do to help?

Think of it as "power steering" for the memory module.

If you have a sports car, you don't need power steering. The steering wheel directly controls the direction of the wheels. In fact, this direct control even maximizes the car's performance (except when parallel parking, of course...)

But, if you have a big, heavy truck, only Ahhh-nold has the strength to move those tires without a little help. So, when you turn the wheel, the relatively weak energy you put into the steering wheel is assisted by a much more powerful motor, which actually sets the direction of the wheels.

So, you want registers if you are moving a heavy load?

Yes, exactly. That's why most servers use registered memory, and in fact most server motherboards REQUIRE registered memory.

Do all registered modules come with ECC?

All Corsair registered modules have ECC. But, strictly speaking, this does not have to be the case. But, since most registered memory configurations have large amounts of mission-critical memory, it only makes sense to use error correction.

Source

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