JDXNC said:
75 x 6.... 450Mhz.... all k6-2's can use 6x multi, just set the motherboard to 2x, it will think its 6x
Not all. There are two versions of the K6-2, the original "Chomper" core, which was released in speed grades only up to 350, can only do a 5.5x max multi. The second revision, known as the CXT "Chomper eXtended Technology" has the 6x multi remapped from the 2x. It also has a couple of speed enhancements that some older motherboards don't enable, write combining being one, but you can run a util like "setK6" to turn them on. The greater part of K6-2-333s around are original chomper cores and are not 6x capable, it was originally thought that AMD was only releasing CXT in 400Mhz and above K6-2s, but that may have only been true for a few months to a year, they did release some lower speed grades, 380, 350 CXTs I have seen, I also have a 333Mhz CXT, this has a production date in 1999 stamped on it. If it's a 1998 chip chances are it's an original chomper and won't support 6x.
AFAIK they never ever released CXTs lower than 333 so 266 and 300 Mhz parts will definitely not have the 6x multi.
Some sites erroneously refer to the CXT K6-2s as sharptooth, the sharptooth is the K6-3, not the K6-2 CXT.
A tip for K6-2 stability at higher bus speeds on PC Chips boards is to set the ram timings lax, crazy glue some ram sinks to the onboard cache, set the multi to a .5 multiplier, set the bus speed to 83 with the 2/5 PCI divider that puts the PCI bus at 33Mhz. For some reason this async mode works best on a .5 divider, probably because the bus timings allow a wait state when set to .5 or something.
http://users.erols.com/chare/586.htm lists the early chompers and CXT seperately, the dates stated are announcment dates, I'm pretty sure that nothing other than a 400 or better was available as a CXT for a few months after those dates, and the 300 CXT may have been a paper release with demand for that speed collapsing before the old stock of chompers was sold out, besides them needing the CXTs more in the higher grades.
heh, sorry, more than you every wanted to know about K6-2s
Road Warrior