Base Clock/ratio--which is better

[medoomi]

After reading through the overclocking guide at the top of the forum, I still haven't figured out what's better:

Is it better to have a higher base clock & lower CPU multiplier, or if a system is stable at 3.5Ghz, can you generally assume different base clock settings/CPU multiplier settings that get the same 3.5Ghz speed would work equally (eg. to get the RAM speed higher)

 

[JDFan]

Main thing is the base clock will also effect the Memory, Northbridge chipset, etc. so in order to be stable may need adjustments made to their multipliers also - so it is more a balance of getting the best ratio for overall performance - without hurting any one portion of the equation ! - But if you were able to keep all of the other things running at the same speed there would be no difference - If however the higher base allows you to also get extra speed from the memory and still be stable then the higher base would be preferable and result in a higher performance level - but then if the higher base requires you to lower a multiplier on something else which makes it run slower than the CPU multiplier is best to use - That said it will vary from system to system as to which is better and takes some experimenting to find the best solution.

 

[kokin]

+1 to JDFan

If you increase the base clock and you lower the multipliers of your CPU, RAM, chipset, etc. You won't see any difference if you keep them all at the same speed. There are some people who report being able to use lower voltages when using a higher base clock and lower multipliers.

I've tried running my FSB/HTT from 200 to 347 and the only useful thing I've found out about FSB/HTT overclocking is that you get to finely tune your settings to your liking and aren't bound by multipliers.

 

[medoomi]

Thanks so much for the replies.

So, I've seen the CPU multiplier, and the RAM multiplier. Which one is for the chipset (are there others beyond these three I'll need to check?)

 

[one-shot]

19 and 21 CPU clock multipliers are more stable than 20. I use 190*19 for 3.6GHz @ 1.25V

RAM x8

CPU x19

BLCK 190

QPI x18

Uncore x16.

 

[Keiki646]

Well What I have done is used a 19x mulitplier. The best you can get with overclocking
here is a video of my overclock how to do
http://www.youtube.com/watch?v=PhAijJyfFlQ

Also this photo as the latest 3D Mark06 score that is 23449

Intel Core i5 750
Windows 7 (6.1) Ultimate Edition (Build 7600)
CPU Arch : 1 CPU - 4 Cores - 4 Threads
CPU PSN : Intel Core i5 CPU 750 @ 2.67GHz
CPU EXT : MMX, SSE (1, 2, 3, 3S, 4.1, 4.2), EM64T, VT-x
CPUID : 6.E.5 / Extended : 6.1E
CPU Cache : L1 : 4 x 32 / 4 x 32 KB - L2 : 4 x 256 KB
CPU Cache : L3 : 8192 KB
Core : Lynnfield (45 nm) / Stepping : B1
Freq : 4009.2 MHz (211.01 * 19)
MB Brand : Gigabyte
MB Model : P55-USB3
NB : Intel DMI Host Bridge rev 11
SB : Intel P55 rev 06
GPU Type : Radeon HD 5850
GPU Clocks : Core 157 MHz / RAM 300 MHz
DirectX Version : 11.0
RAM : 4096 MB DDR3 Dual Channel
RAM Speed : 633 MHz (2:6) @ 9-9-9-23
Slot 1 : 1024MB (10700)
Slot 1 Manufacturer : Crucial Technology
Slot 2 : 1024MB (10700)
Slot 2 Manufacturer : Crucial Technology
Slot 3 : 1024MB (10700)
Slot 3 Manufacturer : Crucial Technology
Slot 4 : 1024MB (10700)
Slot 4 Manufacturer : Crucial Technology

 

[RJR]

Well What I have done is used a 19x mulitplier. The best you can get with overclocking
here is a video of my overclock how to do

Well, that video had nothing to do with OCing.

You may want to get another cooler or lower your vcore, 80's from just running 3Dmark, NOT GOOD.

I did come across your how to video from another one of your posts, you may want to check the Intel data sheet on MAX vtt voltage.

 

[andy5174]

Lower BCLK means lower Vtt. Remember that the maximum Vtt for LGA1156 CPU is 1.155V.

Set the BCLK/Multiplier combination so that you can achieve a certain OC at a lower Vcore. If you can achieve both combinations at the same Vcore, apply the one with lower BCLK and higher Multiplier as this will definitely give you lower Vtt.

 

[andy5174]

Thanks so much for the replies.

So, I've seen the CPU multiplier, and the RAM multiplier. Which one is for the chipset (are there others beyond these three I'll need to check?)

Neither. Uncore Multiplier/Ratio is the one for chipset. In addition, it is fixed at 16x and 18x for i5-750 and i7-860 respectively.

BTW, PCH is the chipset voltage.

 

[bob5568]

Remember that the maximum Vtt for LGA1156 CPU is 1.155V.

Last time I checked max vtt was 1.21v.

 

[Keiki646]

Neither. Uncore Multiplier/Ratio is the one for chipset. In addition, it is fixed at 16x and 18x for i5-750 and i7-860 respectively.

BTW, PCH is the chipset voltage.

Well I used the 18X this time around and now my SPD is 1333
Switch is perfect for my memory because it's 1333
still at a 4.0Ghz

 

[andy5174]

Last time I checked max vtt was 1.21v.

That's absolute max. The max is 1.155V.

 

[bob5568]

Isn't it funny how companies mess with language. Wouldn't we all agree that the terms "absolute max" and "max" are synonyms? Can you imagine a "max" anything that isn't the most possible?

 

[andy5174]

The even more confusing thing of Intel is that they have TWO E6300.

Intel has bloody crap naming method.

BTW:
Max voltage: The maximum voltage that will definitely NOT damage your CPU
Absolute max voltage: The maximum voltage that won't burn your CPU 100%. It might damage your CPU now or in the future.

There is an explanation in Intel's datasheet.

 

[RJR]

@andy5174, what happened to your stickied OCing guide on the other forum???

Did you take it off, I was on there a couple of days ago and didn't see it.

 

[andy5174]

It was taken off by a mod after I argued with him and attached a few benchmarks showing that his X58 is only 3~4fps better than P55 in CF/SLI. ><! LOL

 

[RJR]

It was taken off by a mod after I argued with him and attached a few benchmarks showing that his X58 is only 3~4fps better than P55 in CF/SLI. ><! LOL

Yeah, the mods over there are a bit flaky to say the least.

Sorry they took it off!!

 

[andy5174]

I lost nothing so don't be.

You only need to feel sorry for peoples who need that guide.