I have a question concerning CAS-latencies. I checked the sites of Crucial, Infineon, Kingston, Corsair and Mushkin for their memory specs, only Infineon and Mushkin give more information than simply the CAS-latency. Seems that their top-line DDR-2100 RAM has 2-3-3 specs, their ordinary DDR rams has 2.5-3-3 specs.
As I understand it, the difference in CAS-latencies comes only in to play when doing an out-page read and in this case
the RAS-TO-CAS-delay (3ticks) and the precharge-delay (3ticks) also come in to play. So doing an out-page read will cost in CAS2 8 ticks, in CAS2.5 8.5 ticks.
So the question is: is this small decrease worth the extra money and time finding CAS2-memory?
More about :ddr cas matter
February 17, 2002 7:13:02 PM
youll also notice on mushkins website that they rate their hi perf DDR (up to 256mb) is rated 2/2/2. theyre 512 dimms are rated 2/3/3. i have mushkin hi perf DDR (256mb)...thought id point that out to you =)
well there is aperformance increase, not much. one thing you should keep in mind is if you use two sticks of cas2 it will act like 2.5. ozc makes pc3000. rated at 2.5-3-3. the bandwith it offers is the biggest thing about it. bandwith is better.