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Hi, I have a question regarding about the DDR2 533Mhz RAM, both PC24300 & PC24200 runs at 533Mhz, what's the major difference between the two? Beside that PC2 4300 almost double the price ofr PC24200. THanks

A little googling and the only price differences I found were the other way.
Example look here:
http://pc-memory-upgrade.co.uk/memory/ddr2-533.asp If you are seeing an almost double price difference then you may be looking at different size sticks/kits. Most listings I found for PC2 4200 and 4300 show identical specifications as far as FSB, voltages and CAS figures but one technical report indicated a particular brand of 4300 supports both CAS 4.0 and 3.0
A lower CAS figure is a faster performance, but I don't know enough to tell if that alone would account for any price difference. It certainly does in other cases I've read. The lower the CAS rating the higher the price.Give a man a fish and you feed him for a day.
Teach him to fish and his wife will never forgive you.

No I wasn't look at the different MB stick and PC2 4200 do have CAS 3 memeory also. And I know that the lower the CAS the faster it runs. The only difference I know before asking was that the price was different and also PC2 4200 has Bandwidth of 4.2GB/s and PC2 4300 has Bandwidth of 4.3GB/s. They do have the same FSB, so I don't know what's up with this thing having 4200 and 4300.

Where exactly are you looking that has 4300 at double the price of 4200. Every site I look the prices are comparable and usually the 4300 is slightly less expensive..
The difference between 4200 and 4300 may only be a labeling issue. Eg I run pc3200 in Dual Chanel mode based on FSB of 400. Motherboard base FSB200 x 2=400 x8=3200.
What you are looking at is Motherboard base FSB266x2=533 x8 = 4264 Some for marketing purposes call it 4200 others call it 4300.
Look here:
http://www.techbuy.com.au/searchcat/MEMORY_DDR-2_RAM.asp
The fourth and fifth items down show corsair 1024 mb 4300 at AUD$478.80and 1024mb 4200 at AUD$289.55 but the kicker is in the fineprint. The 4300 is a twin pack containing 2x1024 sticks. Double the amount of ram at way less than double the price.Give a man a fish and you feed him for a day.
Teach him to fish and his wife will never forgive you.

Ok that make sense Richard
http://www.newegg.com/app/ViewProductDesc.asp?description=20-145-528&depa=1
http://www.newegg.com/app/viewProductDesc.asp?description=20-144-170&depa=1
The reason is that Kingston's Hyper seris RAM with Cas Latency 3-3-3-10 kicks ass that's why it's double

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