Depends of which you want, I want consider one being better than the other.
corsair, crucial and ocz
The best RAM depends on your computer model. Good brands include Corsair and Kingston.
Corsair is one of the best you can buy.
DDR2 RAM is SDRAM. It provides double the bandwidth of DDR RAM, but at a higher latency. DDR3 is much better than DDR2 performance-wise, and it uses less voltage.
Most of the manufacturers of DDR2 RAM now make 1Gb sticks for it. They include Samsung and Sony as well as Hynix and Kingston. These are all widely available.
I would recommend Kingston memory or Corsair, both brands are highly reliable, and are ment to last.
No, the slots for DDR2 RAM is different from the DDR RAM. You cannot use DDR RAM with DDR2 slot.
The difference between the memory of the DDR2 RAM and the DDR3 RAM are the capacity that they can hold the DDR3 RAM is more powerful than the DDR2 RAM.
Its because it has better quality than other normal RAM. But there are also other good brands in RAM than Corsair. I would say Seagate is the best.
DDR2 RAM is slightly smaller and has square chips. DDR1 RAM has rectangular chips.
The DDR2 533 RAM is in fact compatible with an iMac. It is very advisable to upgrade an iMac with a DDR2 533 RAM as iMacs are really not known for their RAM.
The difference between DDR1 ram and DDR2 ram, is the advancement in technology. When you upgrade to DDR2, you are doubling the amount of flow information that can take place.