Just came across this page:
http://www.elhvb.com/mboards/kaimei/km-t5-v_3 … kmt5v-rev3.html

it speaks of using a K6 with this motherboard (the first picture matches my MB exactly), but requiring a modification.

So I guess the answer is "maybe".

It does not require any mods since AMD K6-2 will be perfectly fine working at 2.5-2.8v. That said, the board VRM will require additional cooling or it won't last long.

I can tell you what I did, I put a K6-2 @ 400 MHz on a Siemens D1034, setting the switches to 2X (see 6X in the K6CXT) and FSB 66 MHz.
Unfortunately it is jumperless therefore only one VCore (not selectable), I measured in the 2.8V mosfets, missing the jumpers I can not add resistances to get lower voltages.
From what I know there are no mod. for VCore, so at the moment I use it that way. Although I would like to be able to lower the voltage to put a portable CPU (usually VCore 2.1V or less, up to 1.6-1.7V).
I changed the fan and the heat sink with one of the first 370-462 sockets, which is actually a bit bigger.
The mosfets of the VRM of the D1034, are switching so they heat up less than a linear VRM, changing the CPU heatsink should cool them better, in your case I would recommend an additional fan that blows on the mosfet of the VRM.
However, having unlocked your K6-2-300, you can set the multi you want, I suggest you proceed step by step, start by setting the lowest VCore (2.5V) and put the multi 3.5X (then 233Mhz) and see how it goes , I believe that an improvement in PC performance will be visible.
Afterwards if you want you can go up first to 266 (4X) and then even to 300 (4.5X), but I believe that already at 233 the heat produced in the VRM is noticeable, so at higher frequencies it will be even higher, which is why adding a fan.
Maybe the BIOS will recognize you as a simple K6, to me it recognizes it as K6-300 (instead of K6-2-400), but with CPU-Z I checked and it works at 400MHz, so everything is OK.
However, if your VX has linear VRM, I don't recommend putting CPUs faster, even if you can get it to go up to 300 it's enough, for that kind of VRM (linear) I think that at 266-300 you're already at the maximum limit.

The Serpent Rider wrote:

It does not require any mods since AMD K6-2 will be perfectly fine working at 2.5-2.8v. That said, the board VRM will require additional cooling or it won't last long.

VRM?

Hamby wrote:

The Serpent Rider wrote:

It does not require any mods since AMD K6-2 will be perfectly fine working at 2.5-2.8v. That said, the board VRM will require additional cooling or it won't last long.

VRM?

Voltage Regulator Module... but calling the Voltage Regulator Circuit a "Module" in case of Socket 7 motherboard is huge overstatement...

Any VRM, whether it's linear or swithcing type, can be modded to output lower/higher voltage, it all depends on feedback voltage, usually set by resistor divider and fed into "ADJ" or "FB" pin of linear voltage regulator or PWM IC. Yours "KM-T5-V" uses linear VRMs, which are not efficient. According to cpu-world, k6-2 @ 400MHz consumes 17W~ of power at peak, your core VRM would heat up like hell, even if you lowered core voltage to 2.2V.

I took a look at CPU-World to see the Watts of the K6-200 and compare them with the K6-2-300.
The K6-200 has these values:

Minimum / Typical / Maximum power dissipation: 1.6 Watt (Stop Clock mode) / 12 Watt / 20 Watt

The K6-2-300 has these values:

Minimum / Typical / Maximum power dissipation: 3.5 Watt (Stop Clock mode) / 10.35 Watt / 17.2 Watt

So I don't know, maybe I can be wrong ??, but I think the K6-2-300 should hold it cooled well.

I saw that in that MB it is very easy to lower the voltage for the CPU, just add a resistor to a jumper and put it in the 2.5V jumper.
It would be worth to try the 40Ohm one first, I think the 2.17V should be OK.

I have never tried a K6-2 300 on a MB VX with linear VRM, so I don't know if it gives off a lot of heat, but it is also true that the K6-2 with a 2.2V VCore should be cooler than the k6 with Vcore 2.9 V

If your board can't do 2.2 or 2.3v just don't bother with a K6-2.