Hello Craig,
The R in the part number really means nothing, however if you have a part
that has the A and another that does not have the A then this would make a
difference. The part with the A has timings of (2.5-3-3-7) while the part
without the A has the timings of (2-3-3-7). So the difference is a half
cycle on the Cas Latency, making the module without the A a little faster.
Unfortunately the part without the A has been discontinued and it no longer
being distributed. So if you need to purchase a match pair you will need to
get the part with the A. I do hope that this clears things up for you.
PLEASE REPLY WITH E-MAIL HISTORY !
Best Regards,
Tawan Robinson
888-435-5451x3570
Kingston Level II Technical Support
Kingston Technology Company
I guess this makes this BH-6 or CH-6.
"I am become death, the destroyer of worlds. Now, let's eat!