Kinda doubt it on the 400's although you might get lucky!
I'm writting this on a modified BP6 (EC10, VVT, cut traces, changed out regulators, etc.) with the largest coolers that fit on the board (GlobalWIN FEP32's) as well as a Peltier on the BX.
I've run matched and lapped sets of: 366's, 400's, 433's, 466's and 500's and guess what? Best to-date are my present 366's!
I'm running my 366's stable @ 104 FSB (572 Mhz), will go 594 and boot into windowz (some times

) at 605!
Configuration is as follows:
BP6 Ver .41 with modified RU BIOS
dual 366's @ 104 FSB
768 meg PC133 SDRAM
HPT with 1.22 BIOS and 1.28 drivers
WIN2K, SP4/WIN98SE dual-boot
20 gig, 7200rpm WD HDD on channel 3
60 gig, 7200rpm Maxtor on channel 4
PNY FX5000 dual head vid card (AGP)
WinTV GO! in PCI 1
Chaintek 7.1 sound card in PCI 2
Generic Firewire card in PCI 3 (shares IRQ with HPT366 controller)
Adaptec SCSII card for Microtek scanner in PCI 4
generic ISA NIC in ISA 2
dual power supplies: 300watt just for mobo and 450 for everything else
Lite-on 52X24X52 'burner
Sony DVD-r/RAM burner
Pioneer S104 DVD-ROM
Kenwood Multi beam 52X TrueX CD-ROM
external 56K V.92 USB modem
dual ViewSonic 21" Graphic Series monitors
Microtec X6EL scanner
HP LaserJet 5L printer
Canon i900D photo printer (USB)
Cambridge DTT2500 surround system connected to a wireless audio system that puts surround sound out to the gazebo with hot tub on the deck behind the house (need to add flat pannel tv in there

)
The rest is all video related (multiple set top DVD and studio vcrs and tv monitors).
Whew! forgot I had all this stuff

!
Regards,
jaybird
My wife thinks I have to much "junk" in my office but you can never have to many "toys"
