Translate data sheet to basic RAM timings?

From the KVR800D2N5 RAM data sheet.

Single Power Supply of +1.8V (+/- .1V)

Clock Cycle Time (tCK) CL=5... 2.5ns (min.) / 8ns (max.)
Row Cycle Time (tRC)... 57.5ns (min.)
Refresh to Active/Refresh Command Time (tRFC)... 127.5ns
Row Active Time (tRAS)... 45ns (min.) / 70,000ns (max.)

From the GA-EP45-UD3L motherboard manual.

CAS Latency
tRCD
tRP
tRAS

tRC = tRCD?
tRFC = tRP?

Can you translate the data sheet into those four settings?

Looking around the Internet, I guess they might be something like
this.
4.5
4.54
4.46
15.5
(rounded to whole numbers)

I suppose the memory tells the motherboard what the settings are,
but I would like to optimize/tweak the timings just a little.

Which of those four motherboard manual memory settings can usually
be adjusted, and which should be kept the same?

If my questions are boring, please feel free to refer me to some
other source of basic information.

Thanks.