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FSB and Ratio Advice

post #1 of 9
Thread Starter 
I was checking out CPU-Z and my ratio was 5:4 FSBRAM, this was with the FSB at 333Mhz with a 9 Multiplier.

I changed this to 400Mhz with a 7.5 Mutliplier, still running at 3Ghz stock speed. My Ratio is now 1:1, RAM and FSB at same speed.


Is there any benefits to this, or does it just look nice?

if there are benefits to a 1:1 ratio, then ill keep it as I overclock to see how far I can go



just updating my PC specs now
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post #2 of 9
I heard running 1:1 ratio was better, but its hard to get RAM running the same speed as FSB, especially when hitting higher OC's. You will need faster RAM for that. I dont think I ever ran at 1:1 though. I never saw any noticeable when improvements when I did try it out either. Running at 400 is probably the easiest way to go to.
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post #3 of 9
Thread Starter 
I havent noticed any difference, but the RAM speed hasnt changed neither the CPU, I dont wanna buy new RAM, it was hard enough getting hold of 4 4GB DDR2 modules.

My understanding is though, they are PC2-6400, so in theory can run at 800MHz. Is this right or am I thinking wrong?
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post #4 of 9
Thread Starter 
just downloaded 3D mark, gonna bench system and then get to over 4Ghz
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post #5 of 9
Quote:
Originally Posted by SpAcE.BoI View Post
I havent noticed any difference, but the RAM speed hasnt changed neither the CPU, I dont wanna buy new RAM, it was hard enough getting hold of 4 4GB DDR2 modules.

My understanding is though, they are PC2-6400, so in theory can run at 800MHz. Is this right or am I thinking wrong?
the default speed for pc2-6400 is 800mhz (400 x 2), if its less then you have underclocked your ram. cpu-z will show your ram at 400 (default)
so if your fsb is 400 then you are at 1:1 with your ram.

your cpu default is 333 x 9 (=2997mhz or 3ghz) so if you are 1:1 then your ram will be at 333 (333 x 2 = 667mhz ram or pc2-5300) which is underclocked (this is only if cpu is at stock speed)


my fsb is 425 and my ram is 510 and its pc2-6400 so i have the 5:6 ratio (afair) so i have the ram overclocked


Edited by j.col - 5/17/11 at 1:31pm
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post #6 of 9
Thread Starter 
400x2 because the RAM is double banked?

think thats the right term, I mean both sides as the black chip bit things
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post #7 of 9
Quote:
Originally Posted by SpAcE.BoI View Post
400x2 because the RAM is double banked?

think thats the right term, I mean both sides as the black chip bit things
yeah not sure of the exact term. but as its ddr2 its 400 x 2 = 800mhz
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post #8 of 9
Quote:
Originally Posted by SpAcE.BoI View Post
I was checking out CPU-Z and my ratio was 5:4 FSBRAM, this was with the FSB at 333Mhz with a 9 Multiplier.

I changed this to 400Mhz with a 7.5 Mutliplier, still running at 3Ghz stock speed. My Ratio is now 1:1, RAM and FSB at same speed.


Is there any benefits to this, or does it just look nice?

if there are benefits to a 1:1 ratio, then ill keep it as I overclock to see how far I can go



just updating my PC specs now
On the pentium D I have running 1:1 over 4:3 took more than half off my superpi 1m time, it's probably just a quirk of my board but it certainly helped in my case
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post #9 of 9
Ignoring the question of which ratio is better, what you have is now is better for the reason of having a higher FSB. Even though your RAM stayed the same and the CPU frequency stayed the same, the FSB is higher. There's more to it than just CPU frequency.

That being said, since you notched the FSB up, and the RAM/Northbridge are also already running that high, you can always try to bump the multiplier back up (if you can, this might call for more voltage for the CPU) so you'll end up with more FSB and more frequency.
Quote:
Originally Posted by SpAcE.BoI View Post
400x2 because the RAM is double banked?
It has nothing to do with being double banked. All DDR (double data rate) SDRAM operates this way. It works at both the rising and falling edge of the clock, hence twice the operations per clock. The RAM is 400MHz in reality, but is equivalent to what would be 800MHz sans the DDR.

Intel's old FSB used a similar approach, except it was four times the real FSB (quad pumped).
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