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Any real difference between DDR2 4200/5400/6400

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September 12, 2006 4:53:38 PM

Here is the list of memory I am considering for a Asus P5N32-SLI SE with Intel Core 2 Duo E6400:

all memory is DDR2 Dual Channel 2x512

PQI PC4200 3-3-3-8 $95 (never heard of this brand before)
OCZ XTC DC Gold PC4200 3-3-3-12 $96

OCZ DC Special OPS XTC PC PC5400 4-4-4-12 $97

Cosair DC PC6400 5-5-5-15 $131
OCZ EL PC6400 4-5-4-15 $137
Ultra XL DC PC6400 4-4-4-12 $143

is PC6400 really worth the money? or is lower latency better?
September 12, 2006 5:22:07 PM

As far as latency vs. high clocks is concerned one or the other will do, you wont notice a difference betwenn having low latencies vs higher clock speeds.
personally i would go for the ocz pc6400.
September 12, 2006 5:30:29 PM

Quote:
Here is the list of memory I am considering for a Asus P5N32-SLI SE with Intel Core 2 Duo E6400:
blah-blah-blah-blah....
is PC6400 really worth the money? or is lower latency better?


I just replaced my Buffalo 512x2 DDR2 5300 RAM (total 1GB) with OCZ DDR2-800 6400 RAM (5-5-5-12) modules.
I didn't notice any difference. Then again all I did was surf the net after I installed the two 1MB modules while running SPYWARE DOCTOR & Defrag in the background on my E6600 with Asus P5B mobo while my other system was copying over the LAN a bit over 150GB of stuff. I do this normally even with the previous memory. Nope, I didn't noticec anything new. I'll be able to tell when I get home tonite & run Pinnacle Studio.
Can anyone shed any actual facts on this subject? Tanx.
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September 12, 2006 5:46:30 PM

For a Core 2 system the speed isn't that important but I would get 667 so that you can use a CPU with a higher FSB later. Latency is more important though and I would recommend CAS 3 533 over CAS 4 667 if those are the only choices. But I would recommend you look for CAS 3 667 personally.
September 12, 2006 6:33:35 PM

Quote:
For a Core 2 system the speed isn't that important but I would get 667 so that you can use a CPU with a higher FSB later. Latency is more important though and I would recommend CAS 3 533 over CAS 4 667 if those are the only choices. But I would recommend you look for CAS 3 667 personally.


I beg to differ fred... as per a Tom's review seen here:

http://www.tomshardware.com/2006/03/31/tight_timings_vs...

the higher clock is actually a bit more effective than tighter timings. Granted the differences are very small, but higher clocks do win out over tighter timings in memory intensive applications. In everything else, they're basically neck and neck... the differences are so small that you probably wouldn't even notice at all. Go with the DDR2 667 or even the faster DDR2 800. You'll be able to OC the heck out of your CPU with the higher clocked RAM. Of course get CAS 4 if you can, but don't worry if you can only get CAS 5... it will STILL be fast! :) 
September 12, 2006 7:13:32 PM

That refers to AMD chips which can use any clock speed of RAM synchronously. Intel chips are restricted to their FSB's for RAM speed thus the 800 would end up running at 533 (unless you overlock the FSB and decide to burn out your CPU). 800 is a waste for C2D, but for AMD chips 800 with the lowest latency affordable is the better choice.

My suggestion stands, 667 CAS 3 if he can afford it, 533 CAS 3 if he can't.
September 12, 2006 7:43:44 PM

Quote:
Here is the list of memory I am considering for a Asus P5N32-SLI SE with Intel Core 2 Duo E6400:

all memory is DDR2 Dual Channel 2x512

PQI PC4200 3-3-3-8 $95 (never heard of this brand before)
OCZ XTC DC Gold PC4200 3-3-3-12 $96

OCZ DC Special OPS XTC PC PC5400 4-4-4-12 $97

Cosair DC PC6400 5-5-5-15 $131
OCZ EL PC6400 4-5-4-15 $137
Ultra XL DC PC6400 4-4-4-12 $143

is PC6400 really worth the money? or is lower latency better?
I would advise the 533 run @3-3-3- 8. If you plan on overclocking, then get DDR2-800, which is good for at least 400MHz FSB 1:1. DDR2-667 seems to suffer on C2D due to being run asynchronously. Running your RAM at 800MHz seems to cancel the negative effects of running async. To sum up..... either run your RAM @ 533 and 3-3-3- 8 or 4-4-4-12, or at 800@ 4-4-4-12. Only run at 667 if your CPU is running a 333MHz FSB. GL :) 
September 12, 2006 11:36:28 PM

DDR2-800 @CL5 is good, too.
September 13, 2006 10:25:24 PM

Just a little bit of extra Info. Hope this helps with your decision.
September 14, 2006 5:46:59 PM

:D  Thank you to everyone! Your info and opinions are very helpfull. :D 
!