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Multipliers confuse me...

post #1 of 7
Thread Starter 
So I never exactly understood this, why is it so easy to overclock a CPU with a unlocked multiplier? Like you just bump up the multi and watch your speed soar without hardly having to tweak anything else, so certainly there must be some drawback right?

Surely if it were that easy to OC a chip with the unlocked multi then anyone planning to overclock wouldn't even bother with locked CPU's. I mean doesn't having a high FSB and lower multi yield better performance then having a massive multiplier?
post #2 of 7
Quote:
Originally Posted by Semper Fidelis View Post
So I never exactly understood this, why is it so easy to overclock a CPU with a unlocked multiplier? Like you just bump up the multi and watch your speed soar without hardly having to tweak anything else, so certainly there must be some drawback right?

Surely if it were that easy to OC a chip with the unlocked multi then anyone planning to overclock wouldn't even bother with locked CPU's. I mean doesn't having a high FSB and lower multi yield better performance then having a massive multiplier?
No, rising the Multi is best. But BE CPUs are expensive
The only "+" of OCing with Ref Clock is OCing the NB
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post #3 of 7
Quote:
Originally Posted by Semper Fidelis View Post
So I never exactly understood this, why is it so easy to overclock a CPU with a unlocked multiplier? Like you just bump up the multi and watch your speed soar without hardly having to tweak anything else, so certainly there must be some drawback right?

Surely if it were that easy to OC a chip with the unlocked multi then anyone planning to overclock wouldn't even bother with locked CPU's. I mean doesn't having a high FSB and lower multi yield better performance then having a massive multiplier?
Theoretically an higher FSB should bring you higher performance but outside of some benchmarks the difference is usually neligible, especially better memory performance, but unlocked CPUs always have been Extreme Editions which costs a $1000 or more.
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post #4 of 7
Thread Starter 
Quote:
Originally Posted by Telimektar View Post
Theoretically an higher FSB should bring you higher performance but outside of some benchmarks the difference is usually neligible, especially better memory performance, but unlocked CPUs always have been Extreme Editions which costs a $1000 or more.
Surely not ALL of them were that expensive, I mean like for example the i7 "K" CPU's out now aren't nearly that much, and I remember there being older CPU's that had unlocked multipliers but weren't "Extreme Edition" or anything like that.

But there really is no performance loss huh? Seems too good to be true.
post #5 of 7
Quote:
Originally Posted by Semper Fidelis View Post
Surely not ALL of them were that expensive, I mean like for example the i7 "K" CPU's out now aren't nearly that much, and I remember there being older CPU's that had unlocked multipliers but weren't "Extreme Edition" or anything like that.

But there really is no performance loss huh? Seems too good to be true.
Nope, no performance loss. OCing the Ref Clock raises the Ram freq, but you can compensate for that in an ExtremeEdition CPU by either manually raising the freq or lowering the timings, which is generally easier an with the same perf result
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post #6 of 7
Quote:
Originally Posted by Semper Fidelis View Post
Surely not ALL of them were that expensive, I mean like for example the i7 "K" CPU's out now aren't nearly that much, and I remember there being older CPU's that had unlocked multipliers but weren't "Extreme Edition" or anything like that.

But there really is no performance loss huh? Seems too good to be true.
You mentionned FSB and as far as I know all unlocked CPU with an FSB (Pentium IV, Core 2 duo and Quad) were Extreme Edition , i7K and Athlon or Phenom with unlocked multipliers are a differen matter altogether, I don't have any experience with Phemon IIs but they seem to benefit from HT link frequency increase, but from experience Core 2 Duon and Quad don't bring a lot more performance when you increase the FSB.
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post #7 of 7
Why would anyone OC an unlocked multi? Obviously you would, but it's not as much fun as OCing a locked multi. You don't learn any nuances of the board or the CPU as much with unlocked multis and most unlocked CPUs have high clocks at stock anyways.
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