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dimmreaper, I have a small heatsink on mine. However how much of an increase in Vcore could you achieve with a fan blowing on the VRegulator chip, before the rebooting aquired. I have to say my IWill KK266R could reach 2.34volts and had no rebooting issues. Could it be also that the motherboard has a onboard protection circuit thats does not allow the Vcore above a certain voltage level?????? Or could it be because of a varying Vcore a high voltage spike could trigger the voltage protection mechanism on the board.... I wish I could reach 2.2Volts!!!!!!!
__________________ Abit KX7-333 Athlon XP 2000+ @ 1.92GHz Completely Watercooled O' Ya Baby! 256mb Samsung PC2700 Gf4 Ti4600 Audigy Platnium |
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Without the fan, I couldn't run for very long at any voltage with my 200K resistor in place. Anything above 2.05V would wuss out with a 220K resistor in place. We just have got to remember that this part was never really intended to function this way. When you push the envalope, sometimes problems arise, and you have to deal with them. |
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Hey Dimmreaper, I'm just after doing a few experiments, now I attached a fan to the voltage regulator chip which was pushing 30cfm of air on to the chip. These are my results, 2.14 Volts boots to Win XP but soon after reboots 2.1 boots to WinXP but after 20mins-45mins reboots 2.08 same as 2.1volts 2.04 no problems. From the above results I dont think temperature is an issue here since placing a fan on the voltage regulator chip made no difference my Vcore. I can only conclude that the chip or some other factor does not like a Vcore above 2.04 volts...... Maybe Epox Tech can help!!!!
__________________ Abit KX7-333 Athlon XP 2000+ @ 1.92GHz Completely Watercooled O' Ya Baby! 256mb Samsung PC2700 Gf4 Ti4600 Audigy Platnium |
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might be the psu fading cos of the tweaking. didn't you have issues like that, jeff?
__________________ Athlon XP1700+@1540 (140*11), Gigabyte GA-7VAX, 256 Samsung PC2700 at 173Mhz, MTS Glaciator, Powercolor Radeon 8500 275/275, Delta 300W PSU. Duron 600@1102 (105*10.5), Asus A7V, 256MB generic RAM at 140mhz 2-2-2, MTS Glaciator II, Creative GF Pro, Awesome no-name 300W PSU. |
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Paul.K, wonder if it is some type of problem with your Vfb circuit spiking or surging for some reason. This would, in theory, cause the voltage regulator to "throttle back", and actual Vcore to drop off. I dunno, just trying to throw some Idea's out for yah . . . . |
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In my findings Athlon XP is both very variable in overclocking performance and also is not too keen on voltage unless cooled sub zero or at max to about 4° or 5°C above. It does tend to freak at the high voltages unless active cooled - perhaps due to the fact that the "smaller" part of the core does not like the voltage. A small portion of the Palomino core is manufactured on a hybrid process that appears to be smaller than dot one eight according to some professional articles.
__________________ If you need EPoX BIOS eeproms in the UK, goto http://www.epox.org..................... |
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TOO HOT!!! i found that after mounting a remote sensor onto the side of my core that the onboard sensor is in between 13-22C off the actual chip temperature... your chip is WAY too hot... i consider 1.95 the absolute max for air-cooling..... any more and i get reboot problems no matter what board im using....
__________________ B.A.....ICQ#33691781.....Epox 8K7A, 1800XP@1.89Ghz, JK Fab WB and chiller w 2x122W pelts, Prophet Ultra, 512mb OCZ PC-2400, 2x30=58.6gb of Promise Fastraxed IBM GXP, 28.5gb Seagate Backup, TDK Velo-CD 16x10x40x ( IA says its a Plextor ![]() ![]() http://gamershq.madonion.com/compare2k1.shtml?1989990 3DM2k1 |
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oh yeah BTW not to be too negative but you're having the EXACT same problem i had with my 8KHA+ and i finally just took it out and put my 8K7A back in....im thinking that certain batches of 8KHA+'s had voltage problems and doing a volt mod just makes things worse....in my experience ![]()
__________________ B.A.....ICQ#33691781.....Epox 8K7A, 1800XP@1.89Ghz, JK Fab WB and chiller w 2x122W pelts, Prophet Ultra, 512mb OCZ PC-2400, 2x30=58.6gb of Promise Fastraxed IBM GXP, 28.5gb Seagate Backup, TDK Velo-CD 16x10x40x ( IA says its a Plextor ![]() ![]() http://gamershq.madonion.com/compare2k1.shtml?1989990 3DM2k1 |
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I have found that different thermistors will report the same temperature differently. This could lead to a difference of several degrees when comparing motherboards of the same make and model. But still, your experience is radically different from mine, too different for me to accept as fact. |
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This is something I have done a lot of work with and the figure of 13-22°C can only be a complete fabrication. Jeff states correctly the implementation within the specification tolerance of the AMD whitepaper.
__________________ If you need EPoX BIOS eeproms in the UK, goto http://www.epox.org..................... |
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erm.. i have cpu temp measurement that i'm pretty sure is almost 100% accurate, and i get the difference between my mobo and real temp to be 3C MAX. the motherboard thermistor on my 8kha is prolly 2C too low on average. it's less of a difference at higher temps than lower ones, which i suppose is also good. more accuracy at higher temps is what you want.
__________________ Athlon XP1700+@1540 (140*11), Gigabyte GA-7VAX, 256 Samsung PC2700 at 173Mhz, MTS Glaciator, Powercolor Radeon 8500 275/275, Delta 300W PSU. Duron 600@1102 (105*10.5), Asus A7V, 256MB generic RAM at 140mhz 2-2-2, MTS Glaciator II, Creative GF Pro, Awesome no-name 300W PSU. |
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same problem here alluded to in thread I posted a few minutes ago here...Can you Epox guys help here? My 8KHA+/1800xp runs great at 1770 at 2.03v with a 250k ohm resistor for the vcore mod. if I give it the slgihtest bit more voltage(1 fsb higher), all hell breaks loose with random reboots, or won't boot at all (dies trying to get in Win2k). Prime95 will kill it immediately and reboot the system at anything higher fsb/voltage-wise. And this can be with the temp showing 35c. I can run 1770 Prime95 all day long and hit 38c for hours with no problems. Don't think it's heat related as I run 35c idle and 38c load using onboard thermistor on pretty well cooled watercooled system. Currently at 24c sys temp and 34c proc temp. I just know this chip has alot more than 1770 in it. And yes, I am plagued with the reboot/use rest button issue as well.
__________________ ![]() 1800XP @ 1.79 at 2.03v on liquid Epox 8KHA+ Running 11.5x156 Visiontek GeForce3 Ti500 @ 280/615 - 72 watt Pelt 256 Megs Corsair XMS2400 Win2K Pro 3DMark2001 - Exactly 10,000 Default http://gamershq.madonion.com/product...&dprid=1977730 Quake3 FPS - Plenty ![]() |
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__________________ If you need EPoX BIOS eeproms in the UK, goto http://www.epox.org..................... |
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__________________ ![]() 1800XP @ 1.79 at 2.03v on liquid Epox 8KHA+ Running 11.5x156 Visiontek GeForce3 Ti500 @ 280/615 - 72 watt Pelt 256 Megs Corsair XMS2400 Win2K Pro 3DMark2001 - Exactly 10,000 Default http://gamershq.madonion.com/product...&dprid=1977730 Quake3 FPS - Plenty ![]() |
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BTW - love the RoadRunner graphics indeed.
__________________ If you need EPoX BIOS eeproms in the UK, goto http://www.epox.org..................... |
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Quote:
__________________ ![]() 1800XP @ 1.79 at 2.03v on liquid Epox 8KHA+ Running 11.5x156 Visiontek GeForce3 Ti500 @ 280/615 - 72 watt Pelt 256 Megs Corsair XMS2400 Win2K Pro 3DMark2001 - Exactly 10,000 Default http://gamershq.madonion.com/product...&dprid=1977730 Quake3 FPS - Plenty ![]() |
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Thread | Thread Starter | Forum | Replies | Last Post |
Epox 8kha+ question | twilson | AMD Motherboards & CPUs | 3 | 7th November, 2004 06:49 PM |
Epox 8KHA+ Question | hotlips69 | AMD Motherboards & CPUs | 0 | 25th April, 2004 05:20 AM |
HEy Epox Guy! 8kha+ question... | JTPokie | EPoX MotherBoards | 3 | 31st January, 2002 07:14 PM |
Vcore Mod for Epox 8KHA | Jen | EPoX MotherBoards | 5 | 2nd November, 2001 06:30 PM |
Epox 8KHA+ Question? | Paul.K | EPoX MotherBoards | 2 | 23rd October, 2001 02:08 PM |