P4B533-E PCI freq testing

Mikki

Golden Member
Jun 13, 2002
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These tests were done using a PCI Bus Analyzer Web Site



AGP/PCI Lock Test

With the freq setting set at 33.3mhz, I tested each fsb setting from 100fsb to 220fsb. The lock worked fine, without so much as a flux. I had two hiccups along the way where my system failed to boot?one at 178fsb and the other at 201fsb. Both times the PCI bus freq was 33.5mhz, and both times I re-booted and it booted fine.

At regular intervals I ran a benchmark and copied a large file from my cd-rom in an attempt to load the bus, and the freq never wavered.

I also tried setting the freq setting at different freq?s and at different fsb?s and all seemed to work fine.

AGP/PCI Auto Setting Test

This is where it get?s interesting. I set the freq setting to Auto, and then tested each fsb setting from 100fsb to 220fsb. Here are my results:

FSB(mhz)?PCI Bus freq(mhz)
100?33.6
101?33.7
102?34.0
103?34.3
104?34.6
105?35.0
106?35.3
107?35.7
108?36.0
132?36.0 108fsb to 132fsb?36.0
133?33.6
134?33.4-33.5
135?33.7
136?34.0
137?34.2
138?34.4-34.5
139?34.7
140?34.9-35.0
141?35.2
142?35.4-35.5
143?35.7
144?36.0
161?36.0 144fsb to 161fsb?36.0
162?33.5 Failed boot
163?36.0
169?36.0 163fsb to 169fsb?36.0
170?33.5 Failed Boot
171?36.0
209?36.0 171fsb to 209fsb?36.0
210?33.5 Failed boot
211?36.0
220?36.0 211fsb to 220fsb?36.0

PCI Bus Overclocking Test
33.3mhz to 38.7mhz worked as advertised, settings above fluxuated
39.0mhz = 38.9-39.0mhz
39.3mhz = 39.2-39.3mhz
39.6mhz = 39.5-39.6mhz
39.9mhz = 39.8-39.9mhz
40.2mhz = 40.1-40.2mhz
 

THUGSROOK

Elite Member
Feb 3, 2001
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this might explain why i could clock my agp/pci so high?
cause pci never actually goes above 36mhz?
 

Mikki

Golden Member
Jun 13, 2002
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Thugsrook, I haven't done any "extreme" testing yet, I'll do that first thing tomorrow. I did check to see that various settings worked--and they did, but I didn't go up that high. :)

Duvie, not really sure, but one idea I have is that as it starts to boot, something wacky happens and it fails the boot process. At that moment I believe that the freq is actually 36.0mhz. When I reboot, I think it goes into a sort of "safe mode" or 33.5mhz until I'm in the bios and restart. That's just a theory...
rolleye.gif
 

THUGSROOK

Elite Member
Feb 3, 2001
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PCI Bus Overclocking Test
33.3mhz to 38.7mhz worked as advertised, settings above fluxuated
39.0mhz = 38.9-39.0mhz
39.3mhz = 39.2-39.3mhz
39.6mhz = 39.5-39.6mhz
39.9mhz = 39.8-39.9mhz
40.2mhz = 40.1-40.2mhz

nice work Mikki :)
so it does work (agp/pci lock) exactly as advertised :D
 

Mikki

Golden Member
Jun 13, 2002
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Yep...a little fluxing on the higher freqs, but yeah, works like a champ..:)
 

Mikki

Golden Member
Jun 13, 2002
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The geiger only reads freqs in multiples of the PCI bus, meaning if you want to read the AGP freq, you set the jumper to 2x---but that just reads the PCI bus x 2, so it doesn't actually read the AGP bus freq. It'd be cool if they made an add on module that piggy-backed the monitor out port so you could actually read the AGP bus (tho I don't think you could read it there, it'd have to be on the slot itself)...or even an add-on card that you plugged into the AGP slot for trouble shooting, you wouldn't be able to keep it plugged in all the time, but it'd still be cool.... :)
 

Mikki

Golden Member
Jun 13, 2002
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On this board? Yeah, I'm pretty confident that it is...until we find another one of these toys to measure the AGP freq, tho, the only way to tell would be to look at the hardware design itself...on this particular chipset, would it be possible for the PCI bus and AGP bus to be running at different speeds? If so, what keeps them locked at 1:2 under normal operation, and what would cause that component to allow the freqs to adjust independently?

Anyway, that's a bit outta my league...
rolleye.gif

 

oldfart

Lifer
Dec 2, 1999
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I'd like to see what the "turbo" settings on the P4B266 actually came in at. Still have one of those kicking around?
 

THUGSROOK

Elite Member
Feb 3, 2001
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bah! you guys do just as well as me ~ admit it ;)

i just write it up all pretty and make it fun for everyone to follow along :D
 

Mikki

Golden Member
Jun 13, 2002
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Unfortunately, my geiger doesn't work on the BE7...there are some bios settings that may have something to do with that, I'll check into that before I plug my emmy into the board...;)