SDRAM and DDR do not... repeat do not work 2gether even if the board has slots for both... you can use either...typical CAS latencies at max speed for common RAM types is 3 for SDRAM and 2.5 for DDR, 4 for DDR2. those supporting lower latencies are usually boldly advertised as "high speed" RAM. hynix chips...most common...DDR are 2.5 at max speed and 2 for the next lowest. U can use most coomon bm progs lyk sandra to find out supported speeds/latencies. You have to use identical ram types only if you are using dual channel config
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technologically challenged.
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