Bus speed : RAM ratio for overclocks...

Computer_Freak

Computer_Freak

Active Member
Well ive had my PC OC for like a month now

But before i had a FSB : DRAM ratio of 1:1 with a DDR2 533 (266Mhz like my CPU)

now its 2:3 with DDR2 800,

i heard its better to have 1:1 for OCs

What is it that i must have and does it matter?
 
1:1 is "the best" since it means that it's running in sync with the FSB, and running memory out-of-sync is only going to give you better results when memory is significantly faster than FSB. So you'd probably be better off having your memory set to 1:1...

Setting your RAM to 1:1 usually means that it's running at a speed lower than it's designated speed, it gives you more overclocking headroom, which of course is good since your RAM won't be limiting you OC...
 
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would there be any instability of the OC'ing if the memory is running faster than the fsb? for example, 1:2 or 2:3? you will probably get a better performance, but a little less stability since it's not running in sync right?
 
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so then what is the point of getting DDR2 800?

i should then bring the Clock down....

I would need a 3.2Ghz CPU with a x8 multipier to make it 1:1

So DDR2 800+ is then practically useless...
 
@Dragon - Running memory out-of-sync won't cause any instability, unless the memory is some generci brand/value ram and is running outside of its specs. You won't get better performance unless the memory is running SIGNIFICANTLY faster than FSB when out of sync.

@Freak - I should imagine that DDR2 800 should allow you to set the timings a bit tighter when the memory is running below its stock speeds, which of course increases performance. Also, AFAIK (I take it you're OCing the comp in your sig) E6* series CPUs have FSB of 1333mts, which means that at 1:1 ratio your ram should be running at 667 - and if you want to raise your FSB (the only way to OC that CPU) and had 667 ram, your ram would ahve to be OCed which would/could be limiting your OC (get what I'm saying...?)
 
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Running in a 1:1 ratio is best for performance IF you can achieve the same speed by manipulating the FSB. Running in a 1:1 ratio on a stock processor to give you DDR2 533 is not going to be faster then running at DDR2 800.

What I would do is set it to 1:1, but lower the multiplier 1-2x, then you can achieve the same CPU speed, but a higher FSB, which in turn would raise the memory speed.
 
I also use that ratio, i can oc more up to 2.8ghz but the ram wont let me to and im happy with 1:1 ratio as it run syncronize all the way.
 
[-0MEGA-];960855 said:
Running in a 1:1 ratio is best for performance IF you can achieve the same speed by manipulating the FSB. Running in a 1:1 ratio on a stock processor to give you DDR2 533 is not going to be faster then running at DDR2 800.

What I would do is set it to 1:1, but lower the multiplier 1-2x, then you can achieve the same CPU speed, but a higher FSB, which in turn would raise the memory speed.
Click to expand...

Oh yea forgot about this possibility... intels are only UPlocked aren't they?
My brain's shorting out...
 
yeah, in my BIOS i saw no option to change my multiplier.....

And my FSB is 1066, not 1333.

Currently my CPU is at 313mhz and ram is at 471Mhz

So its better to have the ram speed and the bus speed at 1:1..
 
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