Please don't flame but this hasn't ever really been definatly decribed for V4's w/ SW4 switches. Before I start soldering on my board I'd like to have some reliable info. Thats all thanks.Only after we've lost everything can we really do anything.
12-13-2000 18:15:57
RE:Can I get some resister values for V4 w/ K6III+ @ 450-500 (modified 0 times)
If you change R342 from 25K to 40K that should give you a vcore of 1.8v with SW4 all off. With switch SW4-1 closed you should get 2.0v. Verify the vcore BEFORE you install the CPU. It is also a good idea to change R302 to 0.012 ohms to be sure current limiting does not shut the power supply down.
12-14-2000 23:31:18
RE:Can I get some resister values for V4 w/ K6III+ @ 450-500 (modified 0 times)
Thanks Turbo your the man and I don'think that I'm the only one asking this question. Also if you went to a beefier powersupply anyway why don't you just run @ 500 @ 2V and save yourself the heat inside the IOP now that you don't have to worry about your brick takin a dump on you.Only after we've lost everything can we really do anything.
12-15-2000 14:41:04
RE:Can I get some resister values for V4 w/ K6III+ @ 450-500 (modified 0 times)
Because 2.0v generates more heat than 1.8v. The current goes up faster than the voltage drops across Q16 so the total power dissipated in Q16 goes up. Also the current peaks while the CPU is running at 2.0v are much higher and can still push the 3.5v bulk supply a little beyond its capability even with a smaller R302. In this case the voltage drops and the CPU can do strange things (not that Windows doesn't do enough strange things on its own). I always get lower temp readings by using a lower vcore. Keep in mind that the more current you draw from the 3.5v supply the hotter the inside of the iopener will get so you want to keep the current down. The only way to reduce the current a CPU draws (for a fixed multiplier/clock) is to lower (not raise) vcore.
12-15-2000 15:48:29
RE:Can I get some resister values for V4 w/ K6III+ @ 450-500 (modified 0 times)
OK turbo3 got a qestion for you. Would it harm any thing if i totaly removed the q16 chip and put it outside the RF shield, say to the right looking at the back of the IO. and mount it on a rather large heat synk just for these kind of chip's. and run 3 wires from the PADS where the chip was once connected, to the chip its self????
Also i'm looking for someone who could get me a k6-3 500, if i gave them a money order the the PRICE of the cpu. i cant find one peiod. No one has posted any linking info on finding these moble chip's either.
12-17-2000 19:12:26
RE:Can I get some resister values for V4 w/ K6III+ @ 450-500 (modified 0 times)
Be sure to use heavy guage wire for the two power leads on Q16. They handle 6-7 amps of current. The heat sink needs to handle around 12 watts of power and this heat must get out of the case. I use a K6-III+ 450 overclocked to 500 MHz. I have not seen anything higher than 450 MHz for sale.
For me, using two 0.1 ohm power resistors was the best solution. The resistors can be placed at the top of the case and the air from the cpu fan pushes the heat right out the top. The resistors dissipate a max of 9.8 watts (each one is rated at 5W). I could keep Q16 in place but vertical and only add a wire going to the resistors. A small sheet of copper keeps Q16 cool. The system can run 24 hours a day and the temp does not increase after the first few minutes of running.
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