What's more important, CPU Multiplier or CPU FSB?

Zapablast05 · 01-07-08, 11:42 PM

Ok, so I finally started to follow directions for overclocking instead of enter and pray. My CPU's max multiplier is 12x and I max out at 3.0GHz without slowing my RAM down. I did what this one guy did that reviewed my motherboard, start from 5x and gradually work my way up until you max out. So, I started with 5x and my RAM running at DDR2 400 (200MHz) and my CPU FSB at 240MHz and my HT Link at 5x. It went good. Then I started to go up, adding the multiplier by increments of 1 until I couldn't go anymore. I lowered my HT Link to 3x to let me go higher. I reached a maximum of 290MHz FSB at 11x, RAM at (I think, I'm not sure how to calculate RAM speed) 270MHz. I tried getting my RAM to full DDR2 800 speed and I achieved it by lowering my FSB to 260MHz, 11x CPU multi, and 4x HT, and I got my RAM running at 535MHz (WOW) but I ran into some BSOD's, so I just bumped my voltage up about +.250v and my CPU voltage to 1.45 and I got things stable. But then I started getting BAD_POOL_HEADER, partmgr.sys, and STOP: 0x000000F7 BSOD's. Could that be because I'm clocking too high?

Back to the main idea that forced me to post this. Is it better to have really fast CPU FSB with a lowered multiplier? In my case, it would be 260MHz at 11x. Or is it better to have my multiplier maxed out at 12x and my CPU FSB maxed out at 250MHz? What would be faster and what's more important?

**sytaylor** · 01-08-08, 06:17 AM

With a higher FSB your whole machine is going faster whilst the CPU is roughly the same. So you will see better results from a higher FSB most of the time, but it is a balancing act, some apps require more RAW cpu crunching.

Revs · 01-08-08, 06:47 AM

^ What Sy said.

Find your highest FSB with a low multiplier, lower it a bit, then start upping the multiplier until you find the sweet spot. Then it's just fine tuning.

Set your memory timings a bit loose while your messing. Voltages are just trial and error, but don't go too high.

EDIT: oh yeah. While you're upping the FSB make sure the RAM doesn't go over 800MHZ. You can set this after you've found the right FSB setting by altering the FSB-RAM ratio.

**sytaylor** · 01-08-08, 09:03 AM

I r thmart!

01-08-08, 03:31 PM

Quote:

Originally Posted by sytaylor

I r thmart!

Don't make me resurrect your "IDE cable" thread.

j/k

Zapablast05 · 01-08-08, 05:40 PM

Quote:

Originally Posted by Revs

^ What Sy said.

Find your highest FSB with a low multiplier, lower it a bit, then start upping the multiplier until you find the sweet spot. Then it's just fine tuning.

Set your memory timings a bit loose while your messing. Voltages are just trial and error, but don't go too high.

EDIT: oh yeah. While you're upping the FSB make sure the RAM doesn't go over 800MHZ. You can set this after you've found the right FSB setting by altering the FSB-RAM ratio.

I don't have a FSB:RAM ratio, it's all linked. Unless the FSB:RAM ratio is something else in the BIOS? I stopped with my CPU at 292MHz @ 11x, RAM @ 355MHz and no BSOD's or errors.

So basically, I can have my multiplier at 5x and my CPU FSB at like 600MHz?

**sytaylor** · 01-08-08, 06:09 PM

Quote:

Originally Posted by grey_1

Don't make me resurrect your "IDE cable" thread.

j/k

Everyone gotta learn sometime...

Madpistol · 01-08-08, 08:12 PM

I have one small question... why don't we want the ram to go over 800mhz?

ikjadoon · 01-08-08, 09:20 PM

Quote:

Originally Posted by Madpistol

I have one small question... why don't we want the ram to go over 800mhz?

No reason in particular, but that most memory is rated for 800MHz and higher might be unstable. You could just up the voltage, of course, or loosen the timings.

One thing to note, OP: linked (1:1) FSB has been known to dramatically increase memory bandwidth. My RAM, for example, actually runs below spec at 770MHz but that keeps the 1:1 and is actually faster than if I was running it at some weird divider, but over 800MHz. Any real-world increase? I have no freaking idea. Unlinked, however, will make your life much easier at a slight performance loss because it should automatically set a ratio to best suit your RAM.

Weird thing in computers, especially Intel's. Other weird quirks: 2 sticks run fine at 800MHz, but will only run at 750MHz with four sticks; quad-cores hit lower FSBs (and not for cooling issues); FSB holes/strap where the FSB just will not work at a certain speed: like 450-455MHz will never work, but 449MHz and 456MHz will work perfectly. FSB strap is where it jumps to the next standard: 266MHz to about 350MHz is the standard 1066MHz strap, i.e. will be very unstable at 350MHz. 351MHz-425MHz is the standard 1333MHz strap, i.e. 351MHz will be perfectly stable. I pulled those numbers out of my a$$, but they should be pretty close.

I hate to go off-topic, but I've had a question nagging me for MONTHS:

Which actually increases the heat of the processor? Voltage or speed??

~Ibrahim~

LORD-eX-Bu · 01-08-08, 10:42 PM

voltage.

Zapablast05 · 01-09-08, 01:19 AM

It's something like 26F for every square MM on a processor times the voltage. It's some weird calculation on how the heat is calculated.

I didn't quite get that RAM speed thing, but I OC'd my RAM to DDR2 1066, and no issues.

LORD-eX-Bu · 01-09-08, 01:21 AM

difference between 1066 and 800 mhz is negligible, you will have better results with tighter timings on a 1:1 ratio.

01-07-08, 11:42 PM	#1
Zapablast05 ZapaFAILmaster of Merwang Join Date: Jun 2007 Location: Camp Pendleton, CA Posts: 3,083	What's more important, CPU Multiplier or CPU FSB? Ok, so I finally started to follow directions for overclocking instead of enter and pray. My CPU's max multiplier is 12x and I max out at 3.0GHz without slowing my RAM down. I did what this one guy did that reviewed my motherboard, start from 5x and gradually work my way up until you max out. So, I started with 5x and my RAM running at DDR2 400 (200MHz) and my CPU FSB at 240MHz and my HT Link at 5x. It went good. Then I started to go up, adding the multiplier by increments of 1 until I couldn't go anymore. I lowered my HT Link to 3x to let me go higher. I reached a maximum of 290MHz FSB at 11x, RAM at (I think, I'm not sure how to calculate RAM speed) 270MHz. I tried getting my RAM to full DDR2 800 speed and I achieved it by lowering my FSB to 260MHz, 11x CPU multi, and 4x HT, and I got my RAM running at 535MHz (WOW) but I ran into some BSOD's, so I just bumped my voltage up about +.250v and my CPU voltage to 1.45 and I got things stable. But then I started getting BAD_POOL_HEADER, partmgr.sys, and STOP: 0x000000F7 BSOD's. Could that be because I'm clocking too high? Back to the main idea that forced me to post this. Is it better to have really fast CPU FSB with a lowered multiplier? In my case, it would be 260MHz at 11x. Or is it better to have my multiplier maxed out at 12x and my CPU FSB maxed out at 250MHz? What would be faster and what's more important? __________________ Xbox Live: Zapablast05 \|3DMark06: 17,001!\| PSN: Zapablast05 Razer Fanboy Pop your punk. Originally Posted by crainger: "Come meet my son Zapablast05" Originally Posted by crainger: A truck wont get the pussy zapa has become accustomed to. Originally Posted by CaptNKILL: In fact, I measure years in BC and AC (before Camp0rz and after Camp0rz). I don't want to get you drunk, but, ah, that's a very fine Chardonnay you're not drinking.

01-08-08, 06:17 AM	#2
sytaylor Cerebral Barbarian Join Date: Nov 2000 Location: Leeds, UK Posts: 1,656	Re: What's more important, CPU Multiplier or CPU FSB? With a higher FSB your whole machine is going faster whilst the CPU is roughly the same. So you will see better results from a higher FSB most of the time, but it is a balancing act, some apps require more RAW cpu crunching. __________________ Intel Core 2 Quad Pro Q6600 @ 3.42GHz \| Abit IP35 Pro \| GeIL 4GB DDR2 Gainward BLISS GeForce 8800 GTS 512MB 770/1920/1070 Creative Audigy 2ZS on Logitech Z-680s Yuraku 24" Widescreen monitor It saddens me that I need the following to post here: Disclaimer: Any views expressed in the above post under the psuedonym "sytaylor" are entirely subjective and do not reflect the views of any business, company or entity associated with Simon Taylor. The use, copying of or editing of any materials within this post for professional purposes without written permission is stricly prohibitted under the UK Right of Privacy as provided in the Human Rights Act 1998 and the European Convention on Human Rights: Article 10 ECHR. Any attempt to use the information herin shall be subject to the Data Protection Act and Freedom of Information act, with damages being saught for defamation. This disclaimer applies to all text, images or media on this domain. You have been warned. My Blog

01-08-08, 06:47 AM	#3
Revs Registered User Join Date: May 2007 Location: UK Posts: 6,362	Re: What's more important, CPU Multiplier or CPU FSB? ^ What Sy said. Find your highest FSB with a low multiplier, lower it a bit, then start upping the multiplier until you find the sweet spot. Then it's just fine tuning. Set your memory timings a bit loose while your messing. Voltages are just trial and error, but don't go too high. EDIT: oh yeah. While you're upping the FSB make sure the RAM doesn't go over 800MHZ. You can set this after you've found the right FSB setting by altering the FSB-RAM ratio.

01-08-08, 09:03 AM	#4
sytaylor Cerebral Barbarian Join Date: Nov 2000 Location: Leeds, UK Posts: 1,656	Re: What's more important, CPU Multiplier or CPU FSB? I r thmart! __________________ Intel Core 2 Quad Pro Q6600 @ 3.42GHz \| Abit IP35 Pro \| GeIL 4GB DDR2 Gainward BLISS GeForce 8800 GTS 512MB 770/1920/1070 Creative Audigy 2ZS on Logitech Z-680s Yuraku 24" Widescreen monitor It saddens me that I need the following to post here: Disclaimer: Any views expressed in the above post under the psuedonym "sytaylor" are entirely subjective and do not reflect the views of any business, company or entity associated with Simon Taylor. The use, copying of or editing of any materials within this post for professional purposes without written permission is stricly prohibitted under the UK Right of Privacy as provided in the Human Rights Act 1998 and the European Convention on Human Rights: Article 10 ECHR. Any attempt to use the information herin shall be subject to the Data Protection Act and Freedom of Information act, with damages being saught for defamation. This disclaimer applies to all text, images or media on this domain. You have been warned. My Blog

01-08-08, 08:12 PM	#8
Madpistol It's a wittle baby! Join Date: Jan 2007 Location: United States Posts: 4,554	Re: What's more important, CPU Multiplier or CPU FSB? I have one small question... why don't we want the ram to go over 800mhz? __________________ http://bfbc2.statsverse.com/sig/deta...d%20Pistol.png MadPistol's Rig AMD Phenom II X4 965 BE (RB-C3) @ 4Ghz, 1.425 Vcore, 1.25V NB VID Thermalright Ultra 120 Extreme (w/ Scythe Gentle Typhoon 120mm fan) Gigabyte UD3H AM3 790GX motherboard XFX Radeon HD 5870 PNY XLR8 2x2GB CL8 DDR3 1600 G.Skill Ripjaws 2x2GB CL8 DDR3 1600 Soundblaster X-Fi Fatality Titanium OCZ Vertex II 120GB SSD (OS drive) Western Digital 500GB Caviar (black) Western Digital 640GB Blue Samsung DVD burner Logitech MX performance mouse Logitech G15 keyboard Corsair HX 750-watt Modular PSU Antec Nine Hundred case Windows 7 Home Premium x64 ASUS MK241 24" LCD ACER X241W 24" LCD - RIP

01-08-08, 10:42 PM	#10
LORD-eX-Bu Horus the pointy master Join Date: Jul 2002 Location: Salt Lake City, UT Posts: 4,609	Re: What's more important, CPU Multiplier or CPU FSB? voltage. __________________ ΜΟΛΩΝ ΛΑΒΕ!

01-09-08, 01:19 AM	#11
Zapablast05 ZapaFAILmaster of Merwang Join Date: Jun 2007 Location: Camp Pendleton, CA Posts: 3,083	Re: What's more important, CPU Multiplier or CPU FSB? It's something like 26F for every square MM on a processor times the voltage. It's some weird calculation on how the heat is calculated. I didn't quite get that RAM speed thing, but I OC'd my RAM to DDR2 1066, and no issues. __________________ Xbox Live: Zapablast05 \|3DMark06: 17,001!\| PSN: Zapablast05 Razer Fanboy Pop your punk. Originally Posted by crainger: "Come meet my son Zapablast05" Originally Posted by crainger: A truck wont get the pussy zapa has become accustomed to. Originally Posted by CaptNKILL: In fact, I measure years in BC and AC (before Camp0rz and after Camp0rz). I don't want to get you drunk, but, ah, that's a very fine Chardonnay you're not drinking.

01-09-08, 01:21 AM	#12
LORD-eX-Bu Horus the pointy master Join Date: Jul 2002 Location: Salt Lake City, UT Posts: 4,609	Re: What's more important, CPU Multiplier or CPU FSB? difference between 1066 and 800 mhz is negligible, you will have better results with tighter timings on a 1:1 ratio. __________________ ΜΟΛΩΝ ΛΑΒΕ!

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