DDR3 vs. DDR2

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For ease of reading This is divided into 3 Sections
RAM Basics, DDR3 RAM & DDR3 vs DDR2
I hope you find this useful!

RAM Basics
Random Access Memory are computer chips which store data, in PC Terms, they store a computer program so that program will operate it's instructions (i.e. the program is 'loaded') . Because their are electronic, their are much faster & the mechanical disk drives hence a ideal platform for programs
DDR are a part of SDRAM in which chips are installed in small PCS known as 'sticks' & are intelligent enough to organise data within it
CAS Latency refers to how efficient the Chips can manage data in term of read & write access
CAS 5-5-5-8 will be referred to CAS5 & is slower than CAS3 e.g. 3-3-3-8. The first 3 digits determine the CAS overall number
As Such, a CAS3 RAM will be more expensive than the slower CAS5

There are 2 crucial differences with DDR3 over DDR2
(1) DDR3 is technically superior to DDR2 in terms that is can store twice as much of pre-fetch buffer (i.e. chasing the data before storing) as DDR2
(2) DDR3 Chips have a effective clock rate (Bandwidth) of 800-1600MHz, exceeding the usual 400-800MHZ (although there are rare & very expensive DDR2-1066Mhz) of DDR2. This is very important when communicating with Faster CPU Processors
DDR3 also consumes  30% less Power
You must have a Motherboard than has at least 2 DDR3 Sockets. The Intel P35, X38 & X48 Chipsets support DDR3, and DDR3+DDR2 configurations while AMD Will support DDR3 with their RS780 though this may be released in 2009
Because the technological differences, DDR3 PIN-INCOMPATIBLE, as such WILL NOT FIT INTO A DDR2 Socket, as such you will need to purchase a  New Motherboard if you only Have DDR2 sockets
Currently DDR3 Prices are 50-90% higher than DDR2. being relatively new to the market in late 2007, there are not as much around as DDR2, which, in a overstocked market -to-buyers is relatively cheap
DDR3-1066MHZ & Higher tend to have a higher CAS latency over DDR2, Typical CAS7 & CAS9 due to cost production.
DDR3-800MHz Is unlikely to survive to be produced in volume over its poor comparison to DDR2
Performance : DDR3 VS DDR2
When tested on a P35 Motherboard DDR yields a 2% to 3% increase in speed on average. Games has seen the reverse however this is because of their higher Latency rates in DDR3 in it's infancy. also the P35 was a marketing stop-gap solution until the X38 chipset was released which had a ídeal' FSB support for DDR3 Test have shown the X38 to yield a 10% increase
CAS7 DDR3 should be the minimum you should aim for no matter what the speed, though CAS5 DDR# should be very comparable in terms of price to DDR2  in the Autumn of 2008
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