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Cannot stably boot faster than 300Mhz

New MessageCannot stably boot faster than 300Mhz (modified 0 times) cletus323
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I am trying to get my V5 to stably boot at speeds above 300Mhz but I am having problems. Here are the mods to my I-Opener:
-I-Mod2 kit with 20GB hdd
-badflash bios v 5.31
-AMD K62-450P with tennmax lasagna cooler
-Soldered .012 Ohm resistor on top of R302
-Lifted Pin 3 of Q16 and soldered .13 Ohm 10 Watt cooling resistor with 1"-2" wire leads (places on top of processor parllel to memory socket)
-Removed R130
-Soldered switch for SW1 and SW2
-Cut hole in back of RF shield and case for fan airflow, and hole in top of RF shield for heat to escape from the cooling resistor.

Now the problem is I can only get it to post with FSB speeds of up to 83Mhz UNLESS i Remove the Hard Drive attached to the I-Mod2, otherwise it will turn on, but the screen never turns on. When the hard drive is NOT mounted to the motherboard, the display works, and I can post at 100Mhz FSB. I have tried mixing and matching the FSB and mulitipliers and the Vcore, but it is only stable when i boot with 66Mhz FSb and 4.5 multiplier and either 2.2 or 2.0 vcore.

Is everyone else doing something different to get to at least a stable 400Mhz?

I am dual booting WIn 98 and Win XP. I can get it to boot 98 at 400Mhz, but XP always gives me an error during startup.

07-05-2002 09:20:27

New MessageRE:Cannot stably boot faster than 300Mhz (modified 0 times) Turbo3
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Sounds like your system is trying to pull more power than the little Iopener can supply.

I have two Iopeners that currently boot faster than 300MHz. The one I am using right now is an old V3 (1st one I modified) that does not have the dropping resistor. It is running a K6-III+ at 3.5x 100MHz for a boot speed of 350MHz. To keep the power and heat down the Vcore is set to 1.87v and I installed Rain 2.0. CPU runs at 47-50c. Cooling fan is a little Sunon. BIOS is WP 5.40a.

The other system is the first one to hit 600MHz which I just updated with Badflash's version of 5.40a from Wild Pencil. Before that it had booted at 300 and switched to 600 with K6clkwin. This one has a dropping resistor of 0.2 ohms (I like to get rid of more heat in the resistor than in Q16) and is set for a Vcore of 1.74v. CPU temp is 40c which is 10c less than the 350MHz machine so the resistor really helps. (The "CPU" Sensor is closer to Q16 and the "Motherboard" Sensor is under/near the CPU.) Badflash's BIOS has this machine booting directly at 600MHz (6x 100MHz). It also uses the thinner Sunon fan and a custom Q16 cooling system.

Both systems have their 2nd USB ports installed and in use.

A 2.0v core is just too high from all my testing. You will need to go in and add one of the adjustable Vcore changes. A few resistors and a pot should get you going. Make the initial Vcore adjustment WITHOUT the CPU installed. Good luck.

07-14-2002 16:08:26

New MessageRE:Cannot stably boot faster than 300Mhz (modified 0 times) cletus323
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Would the Jameco power brick help this situation at all?

I would appreciate it if someone could point me to a thread with some pointers on dropping the vcore below 2.0v on a V5 I-opener as well.

Thanks!

07-22-2002 06:50:53

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