How to lock PCI and AGP at 33 and 66 MHz?

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KS
offline

OC Newbie
22 Jahre dabei !

AMD Athlon XP
1533 MHz @ 1866 MHz
43°C mit 1.6 Volt

I think that the main source of my problem in overclocking is the instability of the PCI/AGP bus i.e. the PC does POST correctly but the OS won't boot up (sometimes the OS is booting and the PC restart itself over and over again). At the freq between 101-130 and from 134+, the PCI and AGP freq deviate from 33MHz. I heard that ABIT m/b could implement the PCI/AGP freq locking. IS that possible in other m/b e.g. ASUS, ECS?

A7V8X, AMDXP1800+T-bredA

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NWD
aus Gronau (Leine)
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Real OC or Post God !
23 Jahre dabei !

AMD Ryzen 7
3800 MHz @ 4600 MHz
60°C mit 1.325 Volt

hmm..

restarting while booting can also have other causes .. ( i.e. too high RAM Frequency or instable PowerSupply )

if your mainboard has this function it should be in your BIOS or there are some jumpers on the board ( see manual )

but normally the AGP / PCI is set by the FSB

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KS offline OC Newbie 22 Jahre dabei ! AMD Athlon XP 1533 MHz @ 1866 MHz 43°C mit 1.6 Volt	I read the datasheet of the clock generator which says that the divisor (any numbers) could be set via I2C by setting certain bits to the registers. This would make it possible. But I don't know how to do that. I guess it got to be something that is hidden in the BIOS. A7V8X, AMDXP1800+T-bredA
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NWD aus Gronau (Leine) offline Real OC or Post God ! 23 Jahre dabei ! AMD Ryzen 7 3800 MHz @ 4600 MHz 60°C mit 1.325 Volt	i said.. BIOS or not .. Work like you don´t need the money Love like you´ve never been hurt Dance like nobody´s watching Sing like nobody´s listening But Live as if you will die today
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darkcrawler
aus cottbus
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Real OC or Post God !
23 Jahre dabei !

Intel Pentium Dual Core
1600 MHz @ 3206 MHz mit 1.316 Volt

Zitat von KS am 15:06 am Sep. 29, 2002
I heard that ABIT m/b could implement the PCI/AGP freq locking. IS that possible in other m/b e.g. ASUS, ECS?

that isnt possible

only a few nforce motherboards can do it

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KS
offline

OC Newbie
22 Jahre dabei !

AMD Athlon XP
1533 MHz @ 1866 MHz
43°C mit 1.6 Volt

Crazy idea, perhaps.

If I had another clock generator (the same family), I would de-solder PCI, AGP pins of the one on the mainboard and disconnect it. Then I replace those pins with the second clock generator (and other necessary pins e.g. Vdd) and program FS0:3 to fix it at 100/33/33.
Doing this will enable us to overclock the CPU and RAM at any speed without affecting PCI and AGP at all. Do you think so?

An appropriate approach is for m/b manufacturers to incorporate 2 clock generators for this purpose.

A7V8X, AMDXP1800+T-bredA

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NWD
aus Gronau (Leine)
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Real OC or Post God !
23 Jahre dabei !

AMD Ryzen 7
3800 MHz @ 4600 MHz
60°C mit 1.325 Volt

oha dont know if it would work

i have heard about a P4- Mobo mod where someone had changed the Clock generator to get higher Frequencies .. and there are P4 Boards with a locked AGP / PCI..

I think in general it can also be done for AMD MoBos

but i wouldn try to modify a board in that way ..

Work like you don´t need the money Love like you´ve never been hurt Dance like nobody´s watching Sing like nobody´s listening
But Live as if you will die today

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HellerSebastian aus Griesbach offline OC God 23 Jahre dabei ! Intel Core 2 Quad 2400 MHz @ 3450 MHz 60°C mit 1.520 Volt	Is your board a via based board? if it is not nforce board you could not fix the apg/pci clock *HD-MOVIES/HQ GAMES: q6600@ 3,456 ghz 2gb mdt ram gtx 280 @701/1512/1323* INTERNET/LANGAMES: opteron 170 @ 2,91 ghz 2gb mdt ram + 1gb samsung/Infineon ram x1900pro 594/716
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KS offline OC Newbie 22 Jahre dabei ! AMD Athlon XP 1533 MHz @ 1866 MHz 43°C mit 1.6 Volt	Why don't VIA do it? I heard that Intel m/b could do it. You mean any m/b based on NForce2 chipset can do it? A7V8X, AMDXP1800+T-bredA
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NWD aus Gronau (Leine) offline Real OC or Post God ! 23 Jahre dabei ! AMD Ryzen 7 3800 MHz @ 4600 MHz 60°C mit 1.325 Volt	yep i have heared the same .. NForce AMD and most P4 Boards have this lock but no VIA-chipset based or AMD-chipset based boards can do that Work like you don´t need the money Love like you´ve never been hurt Dance like nobody´s watching Sing like nobody´s listening But Live as if you will die today
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