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FX tweeking: FSB vs mult ???

post #1 of 16
Thread Starter 
This is my first rig I've built in 6 years so I'm a little rusty. But from what I've read from the guides and other people it looks like everyone favors upping the multiplier and changing the FSB only if they HAVE TO. Why is this?

When I run benchmarks the high FSB w/ no change to the multiplier beats pretty badly the high multiplier w/ no change to the FSB. I also had to really jack up the voltage to keep my system stable w/ using only the multiplier.

Here's the benchmark I did @ 4.5ghz (the highest I could go only changing the multiplier)

Spec: FX-6100 @ 4.5Ghz
multi:22.5
FSB:200
Ram:1600
NB:2600
HT:2600



And here's the FSB up'd benchmark

Spec: FX-6100 @ 4.5Ghz
multi: 16.5
FSB: 273
Ram: 1455
NB: 2457
HT: 2457




Because of this I'm running at 4.7 with only a x18 multi, and a 261 FSB. But If I should be something different to optimize my performance I'd love to here it. Like I said I'm a little rusty with this ocing stuff. Thanks!
Edited by ocmi_teddy - 11/7/11 at 9:30pm
 
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post #2 of 16
Overclocking with FSB will give you better results, but overclocking with Multiplier is easy ^^ .
    
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post #3 of 16
Thread Starter 
how is it easier? both require 3 key strokes. To do anything via the multi on my cpu has just been a PITA to get stable.
 
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post #4 of 16
Watching this.
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post #5 of 16
Most likely it's because the HT between the modules is too small.
it's 200mhz

if you open [AMD over drive AOD and go to diagram then click [HT Link]
you will see what i mean.

the multiplier making you use higher voltage is kind of interesting. would lead me to the PLL. [phase lock loop] control be corrupted by the multiplier which it should be the opposite. :/
it's almost reverse of phenom I then.
    
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post #6 of 16
Thread Starter 
At 4.5Ghz it wouldn't even boot into the bios unless the voltage was at 1.45, then i had to bring it up to 1.5 to get it into windows.

The HT on the diagram is showing this:
 
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post #7 of 16
How much cpu/nb voltage are you running for the high multi vs. the high fsb?
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post #8 of 16
Thread Starter 
Quote:
Originally Posted by PolRoger View Post
How much cpu/nb voltage are you running for the high multi vs. the high fsb?
1.35V for both (just to be quick when I tested the benchmarks for both)

Right now if I go to 4.8ghz with a x18 mult and 267 fsb and 1.46v vcore @load. I just get a rounding error in prime95 blend at 8 min.

if I go to 4.8Ghz w/ a x20multi at 240 fsb at 1.46v vcore @load with in 30 sec of running prime95 blend I crash and get a stop 0x124 bluescreen.

And from what I've been reading it should be the opposite
 
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post #9 of 16
Quote:
Originally Posted by ocmi_teddy View Post
1.35V for both (just to be quick when I tested the benchmarks for both)

Right now if I go to 4.8ghz with a x18 mult and 267 fsb and 1.46v vcore @load. I just get a rounding error in prime95 blend at 8 min.

if I go to 4.8Ghz w/ a x20multi at 240 fsb at 1.46v vcore @load with in 30 sec of running prime95 blend I crash and get a stop 0x124 bluescreen.

And from what I've been reading it should be the opposite
Error code 0x000124 means that you need more CPU and CPU NB voltage.
    
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post #10 of 16
Thread Starter 
Quote:
Originally Posted by yuksel911 View Post
Error code 0x000124 means that you need more CPU and CPU NB voltage.
I got that but I have my voltages pretty much as high as I'm comfy with right now. The problem is how with it has problems when I try to increase the multiplier
 
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FX-6100 4.72Ghz @ 1.428V 990FX Sabertooth 2 X 6950 Unlocked Crossfired OC'd 925/1375 Ripjaws X (4x4GB) 16GB @ 1739 MHz 
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Crutial M4 64GB 2 x 1TB HDDs Rocketfish 900watt Lian Li PC-K57W 
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Creative Titanium HD Ultrasone Pro 550 
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80GB Seagate XP cheapo 460watt Antec 200 
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CPUMotherboardGraphicsRAM
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Hard DriveHard DrivePowerCase
Crutial M4 64GB 2 x 1TB HDDs Rocketfish 900watt Lian Li PC-K57W 
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Creative Titanium HD Ultrasone Pro 550 
CPUMotherboardGraphicsRAM
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