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-   -   What's more important, CPU Multiplier or CPU FSB? (http://www.nvnews.net/vbulletin/showthread.php?t=105817)

Zapablast05 01-08-08 12:42 AM

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?

sytaylor 01-08-08 07:17 AM

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.

Revs 01-08-08 07:47 AM

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.

sytaylor 01-08-08 10:03 AM

Re: What's more important, CPU Multiplier or CPU FSB?
 
I r thmart!

grey_1 01-08-08 04:31 PM

Re: What's more important, CPU Multiplier or CPU FSB?
 
Quote:

Originally Posted by sytaylor
I r thmart!

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











j/k :p

Zapablast05 01-08-08 06:40 PM

Re: What's more important, CPU Multiplier or CPU FSB?
 
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 07:09 PM

Re: What's more important, CPU Multiplier or CPU FSB?
 
Quote:

Originally Posted by grey_1
Don't make me resurrect your "IDE cable" thread. :cool:











j/k :p

Everyone gotta learn sometime... :eek:

Madpistol 01-08-08 09:12 PM

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?

ikjadoon 01-08-08 10:20 PM

Re: What's more important, CPU Multiplier or CPU FSB?
 
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 11:42 PM

Re: What's more important, CPU Multiplier or CPU FSB?
 
voltage.

Zapablast05 01-09-08 02:19 AM

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.

LORD-eX-Bu 01-09-08 02:21 AM

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.


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