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DDR2 e vs p vs r designations?

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cyclone3d

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I have an ACARD ANS-9010BA SATA 2 DDR2 RAM drive I want to use for older systems.

The manual says that it will not work with registered RAM.

There are 3 different designations that I would like clarification on, but only if you know 100% for sure what the designations stand for.

For example:
5300e (ECC)
5300r (Registered) - is this also ECC ?
5300p is this the same as e or is it ECC Registered or something else? Not been able to find a definite answer on this.

All the p designated sticks I am seeing have the same type of chip that registered chips have but some places list as regular ECC.

Also, would it hurt anything if I tried p designated memory in something that only supports regular ECC or would it just not work if it isn't compatible?
 
Tried p designated RAM in the ACARD device and it isn't detected so it looks to be registered as I suspected.

From pictures I am finding, it looks like r was the older designation for registered and p is the newer designation for registered.
 
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