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Whats the deal with DDR2 speeds?

post #1 of 17
Thread Starter 
DDR2 800
DDR2 900
DDR2 1000
DDR2 1066
DDR2 1100
DDR2 1111
DDR2 1142
DDR2 1142
DDR2 1150
DDR2 1200
DDR2 1250

Whats with all these different types? I know DDR2 is the "Prime" and I noticed on some eVGA 680i motherboard they supported DDR2 800 - DDR2 1200

I'm assuming speed? Maybe something different?

Anyone have anything to add to it or maybe some good Overclocking articles to look at?
    
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post #2 of 17
DDR2 800 means it is certified to run at 800MHz stock. The number after DDR2 is the effective clock speed. You also sometimes see it as PC6400 or something. That is maximum theortical bandwidth in MB/s. DDR2 800 can do 6400MB/s (or 800 * 2 * 8)
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post #3 of 17
Mainly for overclocking head-room purposes.

And for those that don't like to run a 1:1 ratio and use a 1:2 or 2:3, which will make full use of those high speeds.
post #4 of 17
Thread Starter 
But obviously you can get DDR2 800 past the 800Mhz clock.

But am I also safe in assuming that I can't overclock a DDR2 1200 set past 1200Mhz? My logic behind this is that the motherboard cant support that kind of speed? Maybe I'm wrong?

So if the motherboard description on Newegg's site for example says "Supports: DDR2-800" that doesn't mean it cant go past 800Mhz?
    
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post #5 of 17
DDR2 officially only supports 800Mhz. Technically, anything beyond DDR2-800 is overclocked, even if it is provided that way by the manufacturer.

You can read about memory in my article in my sig.
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post #6 of 17
Quote:
Originally Posted by Nechen View Post
But am I also safe in assuming that I can't overclock a DDR2 1200 set past 1200Mhz? My logic behind this is that the motherboard cant support that kind of speed? Maybe I'm wrong?
With my mobo I think I could get at 1:1 about DDR2 1300 if my ram could handle it.

With the use of FSB:RAM ratios, one can get their RAM to run insanely fast. i.e. DDR2 1500+.

Quote:
So if the motherboard description on Newegg's site for example says "Supports: DDR2-800" that doesn't mean it cant go past 800Mhz?
Correct, I'm not sure if any mobo officially supports speeds higher than DDR2 800.
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post #7 of 17
Thread Starter 
Does that mean that if I buy a DDR2 1200 set from OCZ that just means the manufacturer itself just OC'd it?

Could I do the same thing my way? Just take my 800 set and OC it to 1200? lol
    
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post #8 of 17
Quote:
Originally Posted by Nechen View Post
Does that mean that if I buy a DDR2 1200 set from OCZ that just means the manufacturer itself just OC'd it?

Could I do the same thing my way? Just take my 800 set and OC it to 1200? lol
You can try but no guarentee (and very likely chance) of success.
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post #9 of 17
Higher speed RAM has been tested to run at those speeds. If 1:1 is enough for you, DDR2 800 is good in most cases, since that will run at 1:1 with the CPU when the FSB is 400MHz. Also, you often can push DDR2 800 beyond 800MHz (G.Skill HZ easily clocks past DDR2 1000 speeds in most cases).

Only if for some reason you like running RAM faster than the CPU or if you run a CPU with a really low multiplier so that you *have* to run an extreme fsb will it be worth to buy DDR2 1200 or similar fast RAM.
    
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post #10 of 17
Quote:
Originally Posted by Nechen View Post
Does that mean that if I buy a DDR2 1200 set from OCZ that just means the manufacturer itself just OC'd it?

Could I do the same thing my way? Just take my 800 set and OC it to 1200? lol
You can try.

Let me put it for you in terms of Anandtech:

Quote:
http://www.anandtech.com/memory/showdoc.aspx?i=2989&p=2
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