here is a good list obtained from amdzone forum, anyone with k6-x + experiences should go their and help out the list and anyone with equestions as well. Did you know there is a utility to change the multiplier in windows/dos for these processors - it is not 100% complete obviously eg. asus p5a only works for older models of board (defies thinking but true). some boards need extra programs to enable all cpu optimisations. Their is also a possibilty on some boards that do not boot at all at 450mhz to boot at 300 or below (something to do with bios) and then use utilities to change multiplier and implement optimisations.
Best boards are epox mvp3G2 and tyran s1598 i would say
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SUPPORTED MOTHERBOARDS K6-2+
[ INFO FOR ALL BOARDS = The K6-2+/3+ require 2.0 V(Standard)2.2 V Core Max.]
[ EPOX - EXTRA INFO = need 4/12/00 bios / 2MB Eeprom]
EPOX MVP3G2
EPOX MVP3G5
EPOX MVP3C
EPOX MVP3C2
EPOX MVP3GM
EPOX EP-58MVP3C-M(4/11/00 bios needed)
[ AOPEN - EXTRA INFO = need 1/28/00 bios ]
AOPEN MX59 PRO
AOPEN MX59 PRO II
AOPEN AX59 PRO
[ SOYO - EXTRA INFO = need latest bios ]
SOYO SY-5EMA+ V1.0
SOYO 5EHM
[ SOLTEK - EXTRA INFO = N/A ,use latest bios for sure]
SOLTEK SL54U5
[ DFI - EXTRA INFO = N/A, use latest bios ]
DFI P5BV3
DFI K6BV3+/66
DFI K6XV3+/66
[ FIC - EXTRA INFO = N/A, tested with different bios ]
FIC VA-503+ V1.2A(bios je4330)
FIC VA-503-A (bios jn4116)
[ GIGABYTE - EXTRA INFO = need latest bios ]
GIGABYTE GA5AX
GIGABYTE GA5AA
[ ASUS - EXTRA INFO = need latest bios ]
ASUS P5A
[ MSI - EXTRA INFO = REV 4.0 6/27/00 bios ]
MSI 5169
[ TYAN - EXTRA INFO = need latest bios ]
Tyan Trinity S1598
[ FIC - EXTRA INFO = need jn4116 bios ]
FIC 503A
[ AMPTRON - EXTRA INFO = need 1.08 bios ]
Amptron BKMVP4
[ BCM - EXTRA INFO = N/A ]
BCM 1541
[ MICRONICS - EXTRA INFO = need 1.08 bios ]
Micronics C200
[ JETWAY - EXTRA INFO = need latest bios ]
Jetway Ali V V.542b/542BS
SUPPORTED MOTHERBOARDS K6-3+
[ Most of the boards who are able to run k6-2+ will run k6-3+ also ]
[ EPOX - EXTRA INFO = NEED LATEST BIOS FOR PROPER DETECTION ]
EPOX MVP3G2
EPOX MVP3G5
EPOX MVP3G-M (REV 0.4 ,with added on 2MB BIOS chip)
EPOX 58MVP3C-M
[ FIC - EXTRA INFO = N/A ]
FIC VA-503+ V1.2A (bios je4330)
FIC VA-503-A (bios jn4116)
[ ASUS - EXTRA INFO = Use newest bios ]
ASUS P5A
[ GIGABYTE - EXTRA INFO = need latest bios ]
GIGABYTE GA5SMM
GIGABYTE GA5AX (F3 bios)
[ SOLTEK - EXTRA INFO = N/A ,use latest bios for sure]
SOLTEK SL54U5
[ SOYO - EXTRA INFO = need 11/5/2000 bios(v1.1) ]
SOYO SY-5EMA
[ BCM - EXTRA INFO = need 1.08 bios ]
BCM VP1541
[ MICRONICS - EXTRA INFO = need 1.08 bios ]
Micronics C200 (BIOS 1.08)
Because that AMD don't official launch the k6-X + processors,
you can't request any further support of your motherboard manufacturer.
If you would like to run a k6-2+ or k6-3+ and you go buya new mobo ,
the best option is the Epox mvp3g2, because it's very stable
has a good layout and runs the k6-2+ and k6-3+ garanteed!