FSB / DRAM RATIO

gbdtil1

gbdtil1

gbdtil1

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Grateful for advice on best 'ratios' for the above.

I previously had a thread running under the mobo section seeking advice on clocking my E6700 C2D above 3Ghz with a P5N32-SLI SE DELUXE (bios 0204). Some great advice from numerous people but alas I was unable to get the aforementioned hardware to go past 3Ghz with any degree of stability. I have since knocked the fsb down to around 1180 resulting in a cpu speed of circa 2.94Ghz (standard multiplier - x10). (Unable to lower the multiplier with current bios :( )

As stated in previous thread, I have now given up on pushing the cpu further and will try again when I purchase an Asus Commando board in next month. I note however that when running my current Ram (OCZ Platinum Revision 2 pc2 6400) at its rated speed and timings, I get a FSB / DRAM ratio of something like 11:15. (Not sat in front of my home pc so don't have the exact fsb / ram figures at time of writing in case the ratio doesn't make sense. CPU-Z does state 11:15 however)

Having read several threads on this subject I'm now thoroughly confused as to how important a 1:1 versus 3:4 versus 11:15 ratio is. From what I've read, it appears that a 1:1 ratio is optimum and if thats the case, was there any point in me buying the above ram as its too quick for my current cpu speed. That being the case, should I just reinstall my Corsair XMS PC 5300 and lower the speed to around 600mhz to bring this ratio near 1:1? I will of course keep my OCZ ram for when I have a mobo where I can drop the multiplier and raise the fsb to around 400 ;)

Not sure if I'm imagining it but I'm sure I'm currently getting delayed responses in my preferred FPS game (bf2) when trying to execute such things as scoping in and out with sniper rifle, etc. In other words, I've convinced myself that the 11:15 ratio is causing erratic performance in this regard and would appreciate comment on how important (real world performance) is the relationship of the speeds of these components.

Many thanks in advance ;)
 
Well, you've already worked out that the whole point of getting PC6400 RAM was so that it wouldn't be a limiting factor in an overclock i.e. you could raise the FSB to 400MHz and still not overclock the RAM (running 1:1).

Obviously, something else is limiting your current overclock so there isn't much point in having the PC6400 in there. Having said that, I very much doubt that running that memory asynchronously would be enough to cause stuttering/pauses in a game. It would make only a tiny difference in benches.

Whatever anyone says, you still can't be sure so the best thing to do is to swap it out and see - it'll take you 5-10 minutes tops.
 
Buffalo - thanks for that.

Can you confirm (real world performance) 1:1 runs better than 3:4; 11:15 etc or will I get better performance running my cpu @ 2.94Ghz and Ram @ stock (ie 800mhz) - theoretically of course.

Cheers ;)
 
gbdtil1 said:
Buffalo - thanks for that.

Can you confirm (real world performance) 1:1 runs better than 3:4; 11:15 etc or will I get better performance running my cpu @ 2.94Ghz and Ram @ stock (ie 800mhz) - theoretically of course.

Cheers ;)
Click to expand...
Theoretically, 1:1 is better. But you probably won't notice any difference in real world performance.

Why can't you lower your CPU multiplier?
As Concorde Rules says, Conroe loves bandwidth and the higher the FSB, the higher the available bandwidth. Therefore, you may be better off keeping the PC6400 in there, lowering the multiplier and raising the FSB. You could run at the same CPU FSB of 2.94 but the RAM would be running faster. Theoretically, of course.
 
''Why can't you lower your CPU multiplier?'' (quote thingy didn't work - lol)

Because my bios (0204) doesn't allow for any access to the multiplier - beit upwards or downwards - its greyed ouy and inaccessible :mad:

thanks for the input anyway. ;)
 
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