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Can't alter vcore in BIOS

post #1 of 4
Thread Starter 
I didn't know whether this issue was CPU or mobo specific, so forgive me if you feel i've made this thread in the wrong section. I also have another question after I've posed this one too.

I posted this in the Intel Overclocking Guide thread and I just thought id reiterate it here. Basically, although I can manipulate the FSB frequency fine in the BIOS, I can't alter the vcore to give it that extra little bit of power. At the moment I've OC'ed from 2.66 Ghz (20x133) to 2.96 Ghz (20x148)... any higher than this and the CPU becomes unstable (it's actually fine until I play a game and it will crash 10 minutes in.) I've flashed the BIOS to every avaliable version for the board and none of them contain the option. Is there a way that I can still manipulate the volts despite this setback? Any info would be appreciated.

The other question was this. When I set the CPU frequency option to Manual, an extra option for the AGP/PCI frequency appears. Now, I've heard that this is supposed to be set to "fixed" or "locked", but these options don't appear. Instead I get options like 66.7/33.4, or 85.4/64.6 (those arent the actual figures, I was just using them as an example of how the actual ones appear). In this case... which option should I be chosing? At the moment its currently set to "Auto". Perhaps my fellow Asus mobo owners could shed some light on this.

Thanks for your time.
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post #2 of 4
Unfortunately, if you're not seeing a vcore function or something similar name, there isn't much you can do about your CPU voltage. Some chipsets just have this limitation, unfortunately. There may be a hardware mod, but you need some killer soldering skills if one is available.

For AGP/PCI, you'll want 66.7/33.3, which is the same as locking the frequencies at default. Those frequencies can be bumped a bit, but anything much higher than stock will very likely cause instabilities.
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post #3 of 4
Thread Starter 
Darn, thats a shame about the vcore. I guess I'll have to crack on without it.

Thanks for suggesting that AGP/PCI frequency option though, I'll give it a try later. What effect will this have on the CPU's overclocking abilities anyway? Is it just in order to free up some extra power for the processor or something? Also, how much will it affect my OC'ed 6800?
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Intel P4 650 775 Asus P5VD1-X EN7600GS/512 Silent PCI-E 1Gb Crucial Ballistix DDR 
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Maxtor DiamondMax10 120Gb Windows XP Pro. SP2 Samsung SyncMaster 913n Logitech Media Elite 
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Antec TruePower 2.0 430w Aspire XCRUISER-Bk Logitech Pilot Optical 
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Hard DriveOSMonitorKeyboard
Maxtor DiamondMax10 120Gb Windows XP Pro. SP2 Samsung SyncMaster 913n Logitech Media Elite 
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post #4 of 4
Both the AGP and PCI frequency are tied to the external clock of the computer (the same thing that controlls the CPU and RAM). Unlocked, those frequencies rise and become unstable rather quickly, typically with a 10% or lower OC. While a small OC on the AGP may equate to a small performance increase, anything over about 72 MHz will likely cause problems. They don't directly affect the CPU's overclocking ability; their instability just limits OCing of the system.
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CPUMotherboardGraphicsRAM
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Hard DriveOptical DriveOSMonitor
2x250 GB Seagate RAID 0 + 320 GB Seagate Samsung SATA DVD Windows XP Pro/Vista Ultimate 64 bit Viewsonic VA2012wb 
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Saitek Eclipse Corsair HX620 Lian Li V2000b Logitech G7 
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