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Tom's Hardware > Forum > Overclocking > CPUs > Base Clock/ratio--which is better

Base Clock/ratio--which is better

Forum Overclocking : CPUs Base Clock/ratio--which is better

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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)

Reply to medoomi
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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.

Reply to JDFan

+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.

------------------------------ Derp.
Reply to kokin

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?)

Reply to medoomi

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.

------------------------------ Antec P182, i7 920 3.8Ghz @ 1.325V, Xigmatek 1283, Asus P6T X58, 3 x 2048MB OCZ Plat DDR3 1600 RAM, 2 EVGA GTX260 Core 216 in SLI, WD 160gb,320GB 1TB WD Black. Corsair 750TX. Acer 24" Monitor. Vista x64 Home Premium.
Reply to one-shot

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

http://photos-e.ak.fbcdn.net/hphotos-ak-snc3/hs470.snc3/25768_340050531296_581451296_4102260_7312169_n.jpg

http://valid.canardpc.com/cache/screenshot/1040137.png
http://valid.canardpc.com/cache/banner/1040137.png

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

Message quoted 1 times
Message edited by Keiki646 on 03-01-2010 at 09:03:24 AM
Reply to Keiki646

Keiki646 wrote :

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.


Message edited by RJR on 02-25-2010 at 07:02:00 AM
Reply to RJR

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.

------------------------------ Gigabyte GA-P55A-UD5 | Core i5 750@3.6GHz 1.2V | Prolimatech Megashadow | KHX1600C8D3K2/4GX@1440MHz 8-8-8-20 | Asus GTX460 1GB@850(c)-1700(s)-4000(m) 1V | Asus DRW-22B1ST | WD Caviar Black 1TB | Seagate ST3500418AS 500GB | Corsair HX620 | CM HAF 922
Reply to andy5174

medoomi wrote :

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.

Message quoted 1 times
Message edited by andy5174 on 02-25-2010 at 01:02:09 PM
------------------------------ Gigabyte GA-P55A-UD5 | Core i5 750@3.6GHz 1.2V | Prolimatech Megashadow | KHX1600C8D3K2/4GX@1440MHz 8-8-8-20 | Asus GTX460 1GB@850(c)-1700(s)-4000(m) 1V | Asus DRW-22B1ST | WD Caviar Black 1TB | Seagate ST3500418AS 500GB | Corsair HX620 | CM HAF 922
Reply to andy5174

andy5174 wrote :

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





Last time I checked max vtt was 1.21v.

------------------------------ i7 860@3.6ghz(171x21)/ga-p55A-ud4p/prolimatech Megahalems with 2 noctua p12 in pushpull/4x2gb g.skill ripjaw/corsair 520 modular/2 wd black 640 in raid0/evga 8800 gts (g92)/lancool PC-K60B/win 7 64
Reply to bob5568

andy5174 wrote :

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

Reply to Keiki646

bob5568 wrote :

Last time I checked max vtt was 1.21v.


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

------------------------------ Gigabyte GA-P55A-UD5 | Core i5 750@3.6GHz 1.2V | Prolimatech Megashadow | KHX1600C8D3K2/4GX@1440MHz 8-8-8-20 | Asus GTX460 1GB@850(c)-1700(s)-4000(m) 1V | Asus DRW-22B1ST | WD Caviar Black 1TB | Seagate ST3500418AS 500GB | Corsair HX620 | CM HAF 922
Reply to andy5174

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?

------------------------------ i7 860@3.6ghz(171x21)/ga-p55A-ud4p/prolimatech Megahalems with 2 noctua p12 in pushpull/4x2gb g.skill ripjaw/corsair 520 modular/2 wd black 640 in raid0/evga 8800 gts (g92)/lancool PC-K60B/win 7 64
Reply to bob5568

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.


Message edited by andy5174 on 02-26-2010 at 06:33:53 PM
------------------------------ Gigabyte GA-P55A-UD5 | Core i5 750@3.6GHz 1.2V | Prolimatech Megashadow | KHX1600C8D3K2/4GX@1440MHz 8-8-8-20 | Asus GTX460 1GB@850(c)-1700(s)-4000(m) 1V | Asus DRW-22B1ST | WD Caviar Black 1TB | Seagate ST3500418AS 500GB | Corsair HX620 | CM HAF 922
Reply to andy5174

@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.

Reply to 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 :p

Message quoted 1 times
Message edited by andy5174 on 02-26-2010 at 06:53:40 PM
------------------------------ Gigabyte GA-P55A-UD5 | Core i5 750@3.6GHz 1.2V | Prolimatech Megashadow | KHX1600C8D3K2/4GX@1440MHz 8-8-8-20 | Asus GTX460 1GB@850(c)-1700(s)-4000(m) 1V | Asus DRW-22B1ST | WD Caviar Black 1TB | Seagate ST3500418AS 500GB | Corsair HX620 | CM HAF 922
Reply to andy5174

andy5174 wrote :

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 :p



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

Sorry they took it off!!


Reply to RJR

I lost nothing so don't be.

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

------------------------------ Gigabyte GA-P55A-UD5 | Core i5 750@3.6GHz 1.2V | Prolimatech Megashadow | KHX1600C8D3K2/4GX@1440MHz 8-8-8-20 | Asus GTX460 1GB@850(c)-1700(s)-4000(m) 1V | Asus DRW-22B1ST | WD Caviar Black 1TB | Seagate ST3500418AS 500GB | Corsair HX620 | CM HAF 922
Reply to andy5174
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