Upgraded Presario 1690 laptop processor with AMD k6-3 450 , now problems?

Question

I wanted my Compaq Presario 1690 laptop to perform a little better so I purchased a AMD k6-3 450 to up the performance. originally I was using the AMD k6-2 400 without a problem (stock in most 1690's), I could even overclock it a bit to 450 with no problems. Well I installed the k3 leaving the factory setting's intact which is 2.2 v 100 mhz x4 on the motherboard(the k63 is 2.2-2.4 core) and it boots up fine , but when I open a application the computer freezes. I tried every single dipswitch setting in the service manual and what I could find on the net that others have used but still the same problems. Sometimes it will work for awhile than it will freeze. I have a socket 7 cpu heatsink and fan installed in my laptop so I dont see heat as the problem , plus these amd k3's are suppose to run cooler anyway.

I also underclocked it to see what was the deal and had it clocked @ 188 mhz and although it did run ok eventually it froze when opening another window.

The only big difference in the CPU's is the k6-3's have 256 mb l2 cache and th k6-2 400s dont. I have adequite memory and I guess I am just in a slump. I paid good money and bought it from a reputable seller that states it passed all the testing. i did notice however that on some of the pins I noticed some blackness towards the base of some pins and kinda a little corrosion when I recieved the unit.

Why the freezing? Is the CPU just not processing correcty?

I was told and I figure it would be a plug and play type deal but I was sadly dissappointed

If anyone has any ideas please let me know and if you need any more info to help me figure out this problem just ask

My Motherboard says it can handle up to 475 mhz and everything is set so it should of just ran normal but failed
Thanks in advance

Answer 1

As far as I recall, the K6-3 and K6-2, even though from the same family, works differently, theres a whole bunch of instructions on the 3 that may be the cause of your problem, I am steering towards the BIOS that its not designed to make use of the K6-3 features, so when the BIOS trys to access some K6-2 calls, they are steer towards teh new instruction sets and hangs.