Can i use266 and 400 DDR RAM together

I had got two RAMs one is 256 MB DDR 400 and one that I got from by bro is 128 MB DDR 266. Can I use them together. I am providing all the details below. I am able to use them together but I will like to know it will be healthy for my RAMs or not. When running together they run at 133 MHz.

The details are->
--------------------------------------256(DDR 400)------------128(DDR 266)
Current Memclock (Mhz)----------------200-----------------------133
CAS# latency--------------------------CL=3.0-------------------CL=2.5
Row cycke time (tRC)---------------------11-------------------------9 Bus Clocks
Row refresh cyc time (tRFC)--------------15-----------------------10 Bus Clocks
RAS# to CAS# delay (tRCD)--------------4-------------------------3 Bus Clocks
Row to Row delay (tRRD)------------------2-------------------------2 Bus Clocks
Min RAS# active time (tRAS)--------------8-------------------------6 Bus Clocks
Row precharge Time (tRP)-----------------4-------------------------3 Bus Clocks
Write recovery time (tWR)-----------------3-------------------------2 Bus Clocks
Write to Read delay (tWTR)----------------2-------------------------1 Bus Clocks
Read to Write delay (tRWT)----------------4-------------------------4 Bus Clocks
Refresh period (tREF)------------------2x3120-------------------2x2064 Cycles

If they can work together do i need to manually configure the above settings or not. If I have to then what should be the settings.