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Ok...I thought I knew about memory overclocking - experts chime in.

The Sauce

The Sauce

Diamond Member
I just got through reading the CPU magazine special Spring Modding edition. There it seems that every memory they tested or benched they ran asynchronously. As a matter of fact they didn't test anything running in sync with the FBS on AMD systems (?!?) Everything was like 5:4 etc. I thought running asynchronously was BAD and actually slowed down the system despite a higher memory clock. My memory can definitely clock up much higher than I'm running it if I'm not 1:1. What are your thoughts on this?
 
Originally posted by: PorBleemo
I never really thought about since I don't overclock my processor. Bump for more reads.

-Por
Click to expand...

Doesn't have anything to do with overclocking your processor. That's the point. They were running all their memory much faster than the rest of the system - out of sync.
 
An Athlon XP's FSB is only 2x200MHz in the best scenario. Using DC PC3200 as in the nForce2 is already overkill unless you are using an onboard GPU; I'm guessing this is the theory behind it.

Another possible reason might be that the chipset cannot work reliably above above a certain speed so they have to use memory ratios to max out the CPU overclock, assuming the system is faster than just running synchronous at a lower speed.
 
Intel chipsets like the ratio at 1:1. I think Via chipsets are less fussy. However, 5:4 is not a lot different than 1:1. As you increase the cpu fsb above 215 with an Intel chipset (like i865) you may need to switch from 1:1 to 5:4 to keep the ram stable. That's one reason to use 3500 or 3700 ram rather than 3200 ram if you plan to oc. You may be able to maintain the 1:1 ratio up to a higher fsb.
 
P4's are faster with ratios. If your overclocking the fsb really high like 250 and need the ratio to keep the cpu at 200 fsb. It'll be faster than running 1:1 at 200.
 
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