Raising VIO on A7V...

[Guest]

After reading about mods on an EPoX 8KTA3 (KT133A), <A HREF="http://www.vr-zone.com/#1142" target="_new">http://www.vr-zone.com/#1142</A>...
I thought: why not try something like this on my A7V?...
-How high of a VIO is still safe? (is 4.36V safe?)
-Which components are affected by an increase in VIO? (Northbridge, of course...anything else?)
-...And to those who have done something similar: is it worth doing on a KT133 MB?
-(Any other warnings you might like to add?)

😱 😱 ...=o)

 

[Guest]

fine, don't reply 😛

 

[Guest]

Anyway...

I seem to have found a way of increasing the IO voltage on the A7V :

On my A7V Rev 1.02:
-> Connect R213, the side closer to the VIO jumper, to ground via a ~56K resistor.
(R213 is the middle resistor in a group of three. The group of three resistors is just beside the VIO jumper. Sorry, but I have no way of posting pictures... :frown: )

-> if R213 is hard to get to, connect the same 56K resistor from pin 5 of the HIP6012 chip (aka U8) to ground.
(the HIP6012 is to the right of the VIO jumper. Around where those inductors, capacitors, and FETs are)

On my motherboard, the three VIO jumper settings before and after modification:
Before: 3.15V, 3.33V, 3.45V
After : 3.52V, 3.70V, 3.83V

-Using a lower resistor would increase the voltages even more, up to a theoretical maximum of ~5V, and by using a higher resistor, the opposite.

Disclaimer: I'm not responsible for damage to your board, cpu, or anything else that is affected by modifying your motherboard...

Now that that is done with...
I haven't personally tried running with these new voltages yet. I simply used a multimeter to read off the VIO. (I don't have a CPU right now, so I'm just playing around with the motherboard )

Whether increasing the VIO can allow increased FSB speeds, I don't know. If anyone tries this, please post your experiences! =o)

good luck, be careful, and use some heat sink compound on the Northbridge heatsink!

 

[Guest]

<A HREF="http://www.stuffedcow.wox.org/" target="_new">Finally, a picture =)
...but blurry though. Scanners don't work well on motherboards </A>

 

[Guest]

Dear Henry

Thanks for the tips and picture, I haven't done it, need to hand in one assignment today and another report within this week.

Ok after understanding that higher resistance gives less V and lower resistance (i.e. if zero=shorting) gives more V

I will use perform toms tip with an extra 20K trimmer

then

your case I want more V therefore will use a 24k plus a 40k trimmer

probably do it next week when I get all the assignments out of the way, will post a picture to you later. Bye!

Best regards
cx5