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How are the PCI/AGP buses determined?

post #1 of 12
Thread Starter 
I was wondering how the AGP and PCI buses are determined. There is no option in my BIOS to lock them, so I was wondering if there was some type of formula of maybe a program out there to find out what my PCI and AGP buses are at. I worriy about going over their safe limit and corrupting my HD or something.

Thanks.
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post #2 of 12
No locking usually isn't a good sign, but you should find the speed in the BIOS regardless. PCI you want to keep around 33 and AGP around 66. Just OC and watch those two numbers carefully.
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post #3 of 12
Thread Starter 
Hehe, thats the only thing, I am at 2.6GHz now, and I am worried about getting something messed up, especially my HD's.

I dont have any options that monitor it in my BIOS, dang TechTV Screen Savers telling me to buy this mobo because it is a good overclocker! I bet they got a check from MSI for that.

Anyway, I am guessing it is HTT / ? to get PCI, then PCI x2 to get AGP?
If stock is 33 Mhz, then 33 = 200/X ; X must equal about 6. So if my HTT is at 260 then 260 / 6 = 43! Making my AGP 86! Oops, look like I'll scale her down to around 2.3GHz. Errr.

Does the above sound plausible? Including my guesses.

For now i'll be at 2.3GHz / 38.33 MHz (PCI).
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post #4 of 12
It seems very plausible, but your mobo is based on K8T800 wich is a chipset that has a AGP/PCI lock. Dunno if on your mobo it is implemented however, but if it's not you are kinda limited while OCing.

I think there are a lot of softs that can measure the freqs of the pci/agp like cpuz, sandra, aida32... You'll find something that supports your mobo.
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post #5 of 12
Remember you can also contorl PCI and AGP speeds using multipliers if the board doesn't have a lock. Skim through your bios and look for the setting. It should have options like 6:2:1, 7:2:1. Thats HTT/AGP/PCI
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post #6 of 12
Quote:
Originally Posted by dragosmp
It seems very plausible, but your mobo is based on K8T800 wich is a chipset that has a AGP/PCI lock.
only the K8T800 Pro has locks - even then they can become squirrely for 3D ~260HTT

as has been said you should be able to use dividers.
post #7 of 12
If you are at 2.6GHz and not experiencing problems then you must have a asynchronous lock. Has to be as if you just do a simple divisor ratio since you already know (hopefully) the maximum you want your PCI bus to be raised. It is 37MHz for stability purposes.

You know the default PCI BUS = 33MHz
You know the max PCI BUS = 37MHz
You know your default GHz = 2000MHz ( I believe for your system)
Highest GHz will = X

So 33MHz --- = --- X
Divisor 37MHz --- = --- 2000

Thus 33X = 37 X 2000 brings you 33X = 74000 which brings you to X = 74000/33 which equals out to ~2.242

Thus ~2.242GHz will be your maximum limit to take the PCI bus to 37MHz. To take it to 2.6GHz means you are locked.

R
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post #8 of 12
Thread Starter 
Quote:
Originally Posted by Ropey
If you are at 2.6GHz and not experiencing problems then you must have a asynchronous lock. Has to be as if you just do a simple divisor ratio since you already know (hopefully) the maximum you want your PCI bus to be raised. It is 37MHz for stability purposes.

You know the default PCI BUS = 33MHz
You know the max PCI BUS = 37MHz
You know your default GHz = 2000MHz ( I believe for your system)
Highest GHz will = X

So 33MHz --- = --- X
Divisor 37MHz --- = --- 2000

Thus 33X = 37 X 2000 brings you 33X = 74000 which brings you to X = 74000/33 which equals out to ~2.242

Thus ~2.242GHz will be your maximum limit to take the PCI bus to 37MHz. To take it to 2.6GHz means you are locked.

R
So you're saying that it is locked as default or something? Anything higher than 2.6 and my CPU is the limitation. It barely does 2.6, crashes at 2.65. This is of course with stock voltage.
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post #9 of 12
Quote:
Originally Posted by rippon
So you're saying that it is locked as default or something? Anything higher than 2.6 and my CPU is the limitation. It barely does 2.6, crashes at 2.65. This is of course with stock voltage.
I have seen ASRocks with built in locks so yes, this could be the case. I don't think you could make a 2.0 - 2.6GHz raise of the FSB without one in place. They also make some boards with the ability to lock the pci-e/pci bus.

2.6 is good for an overclockers specific board so on your board it is not a bad overclock at all. There are two ways to overclock on your board. One is to use the built-in overclock technology that your manual will refer to as MSI DOT(Dynamic Overclocking Technology). Are you using the DOT overclock technology of that board?

R
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post #10 of 12
Thread Starter 
Quote:
Originally Posted by Ropey
I have seen ASRocks with built in locks so yes, this could be the case. I don't think you could make a 2.0 - 2.6GHz raise of the FSB without one in place. They also make some boards with the ability to lock the pci-e/pci bus.

2.6 is good for an overclockers specific board so on your board it is not a bad overclock at all. There are two ways to overclock on your board. One is to use the built-in overclock technology that your manual will refer to as MSI DOT(Dynamic Overclocking Technology). Are you using the DOT overclock technology of that board?

R
No, I disabled all those settings and stuff and raised the HTT to 260, and set a "limit" on the ram at DDR333. So my ram is running at 215 because It can't handle 260.

Sadly I cannot get it past 2.6GHz no matter what I do. Even raising the Vcore from 1.45 to 1.55 didnt do it. I am thinking this is may be the CPU's limitation?

Too bad no multiplier control.

Oh well, a 30% overclock isnt too bad considering it is a s754 Newcastle.
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