This graph shows that DDR-2 has more headroom to achieve better incremental clock speed gains as access latency times are reduced. So you' ll get a half the efficiency accessing the Burst-Length 4 memory device. You might be able to hook up a chip that' s built for DDR1memory to DDR2 memory, and even run it at a high frequency, but you get horrible utilization out of the memory, because that DDR1 memory subsystem is all built around Burst-Length 2 accesses. So the entire memory subsystem has to be designed to handle that. There are fundamental differences between DDR1 and DDR2, and if you want to make good use of DDR2, you have to design around longer burst lengths on the memory, because that' s how they' re going faster. So hold out on this new technology for a while Also, currect DDR2 even runs at slower CAS speeds than, DDR, which all adds up.
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Thoeretically, the maximum speed of DDR is DDR400 or PC 3200, while some vendors claim to be tweaking their momery to get much higer speeds.but anyway.DDR2 is really just an upgrade to get higher speeds of memory, and while the technology has good motives, at this point in time, stick to DDR guys. Essentially the only advantage of DDR2 is to allow memory to operate at highers speeds. DDR2 really has no optimiations over DDR, and right now is actually slower than DDR. Total garbage, and is a wste of time to spend your money on it at this point.
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