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1:1 vs. Higher Memory Speed?

post #1 of 11
Thread Starter 
Hey all Was looking into my new build and trying to work out methods of overclocking with the CPU and RAM.

Now, I'm getting an E6600 with 2GB of G.Skill PC6400 800Mhz HZ's. This means that if I overclock to 3.6 Ghz (for example), that requires 400FSB, which is 800Mhz on the memory. That's stock for the memory. And that's running a 1:1 divider.

Now, If I were to overclock the memory to 1000Mhz (which I know the HZ's can do pretty easily) ...or even 950Mhz ... will this produce better or worse performance than running with the 1:1 divider? Surely if the memory is faster, it means the system is faster? Right? Or wrong. You advise me

Thanks in advance,
John.
    
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post #2 of 11
1:1 has proven to be better in my experience. Although some applications like the higher bandwidth, most synthetic benchmarks prefer 1:1. Timings don't matter as much with an Intel system versus an AMD.

1:1 gets my vote, but run some benchmarks for yourself and see.
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post #3 of 11
It depends. If you can run DDR2 800 at 4-4-4-12 and 1T command rate, it'll likely beat the higher bandwidth esp. in an AMD rig.

However, if yuo cannot force 1T at DDR2 800 speeds, then it's probably worth shooting for the overclock.

See images below... both are at identical settings, other than the RAM frequency. The command rate is 2T in both cases (can't force 1T on that board). Since I managed to keep timings at 4-4-4-12 at DDR2 1000 speeds, I did get better SuperPi times, and a marginal improvement in 3DMark's CPU score.


    
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post #4 of 11
Thread Starter 
Cheers for that Legend. But surely the higher memory would make the system run faster? Or does the 1:1 aid the CPU in working synchronously with the memory.
    
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post #5 of 11
I prefer memory speeds over 1:1.

But, find the sweet spot in the middle. DDR2-970 4-4-4-5 is the sweet spot for me
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post #6 of 11
Thread Starter 
How would I find out the 'sweet spot' for my RAM? Which benchmarking programs would be best for comparison?
    
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post #7 of 11
For some reason I cant run my ram at 1T no matter what, I run my ram at 1066 5-5-5-15-2t, which scores about 260 marks higher in 06 compared to 800 4-3-3-7-2t. But C2D doesn't really care about timings I hear.

With your processor I would say better timings would be better.
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post #8 of 11
Quote:
Originally Posted by JohnRogers View Post
How would I find out the 'sweet spot' for my RAM? Which benchmarking programs would be best for comparison?
Well, lol, if you dare read the most posted thread in the Intel Memory section. It was 300 posts of people bickering between 1:1, 2:3, and 4:5. Basically, we concluded that the best set-up for a c2d is the highest memeory speed at CAS 4.

http://www.overclock.net/intel-memor...m-extreem.html
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post #9 of 11
dividers have little or not noticable effect on memory performance....in my experience it would be faster if you could run them @ 1T (for example: )
if i would put my memory on the default 550mhz 2.5-4-4-8 2T it produces around 8300mb/s read, 6400mb/s write 7000mb/s copy, but if i put them on 500mhz with 1T timing on a divider i get 7300mb/s read 7300mb/s write, 7300mb/s copy (in Everest) and although the clocks are lower, performance is in fact higher than with the 2T timing good for around 80% of the total 8000mb/s memory bandwidth, very noticable, not only in synthetic benchmarks
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post #10 of 11
Thread Starter 
Cheers for the link mate
I understand alot about memory, but the only thing I don't understand, is the timings. Could someone give me a quick crash course on these? All the ones I've searched for on Google go really in depth to stuff and I only want a basic understanding of what they do in order for me to tweak 'em to overclock.
    
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