In a web server, DDR2 and DDR3 are indistinguishable.
DDR2 3200-8533 MB/s
DDR3 6400-17066 MB/s
Hard drive ~ 50 MB/s
gigabit network 100 MB/s
Although some DDR3 is "faster' than DDR2, both are about 60-100 times faster than a hard
drive, so unless you have quite a few hard drives the RAM speed doesn't matter at all.
A web server basically takes bytes from hard drives and sends it to the network card, so what
matters is the speed of the drive array and the network card. The CPU and RAM speed don't
matter a bit for a web server. If you have a lot of ram the most frequently accessed files can
be cached in memory and not read from the drive, but that's about how many MBs of RAM you
have, not it's speed.
Most servers today also have a small database. A MySQL database is also generally limited
by disk access time. Normally, only a badly broken PHP script would thrash the database
so that memory speed could possibly start to matter.
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I can see only has a difference with the Memory of DDR2 to DDR3
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Does either company know that the hell they are doing? I hate to say it, but most hosting
companies don't employ qualified people, because webmasters don't know to look for that.
Knowledgeable sysadmins will make a MUCH bigger difference than memory speed.
What about their reputation for integrity or lack of it? That could make a huge difference,
not just in whether or not they screw you over directly, but indirectly too, such as whether
or not your mail is blocked because they allow other customers to send spam. That again
is something that will likely make a real difference in time, whereas RAM speed won't matter.