|Posted on Monday, November 18, 2002 - 7:22 am: |
Current system is a K6-2 350, asus p5a mb, 64mb ram, gforce2 gts 32mb video. The bios has been upgraded to the most recent version. In this form, the system is entirely stable and I have no problems. (operating systems are red hat linux, 2.4 kernel, and win 2k)
Recently, I installed a k6-2+ 550 mhz processor on the mb. I switched the core voltage to 2.0 from 2.2 and used a 100 mhz bus speed with 5.5 mhz multiplier. The bios recognizes the processor as a k6-2+ 550 mhz. The chip does not overheat or otherwise seem to cause errors.
Once I installed the 550 mhz k6-2+, the system became completely unstable. I cannot go 10 mins without the system crashing. Sometimes it hangs on boot, but it seems entirely random, often I can boot windows and it crashes in windows. I have tried core voltages of 2.1 and 2.2 with no change in stability. The motherboard supposedly supports the chip according to the manufacturer and other people have posted that they have used it without incident.
Any idea what could be causing this?
|Posted on Monday, November 18, 2002 - 10:31 pm: |
To what I can find, your motherboard only supports up to a amd 350mhz cpu.
Intel Pentium® Processor P55C/P54C/P54CS 90MHz-233MHz (66Mhz).
Cryix M IITM 300MHz ~ 333MHz , 6x86MXTM PR166+ ~ PR266+
AMD-K6® -2, AMD-K6® 233MHz ~ 350MHz
ALi® M1541 Aladdin V AGPset to Support up to 100MHz System Bus
ALi® M1543 Super I/O Controller
On Board Pipelined Burst SRAM 512KB (-5ns)
* 3 x 168-pin 3.3v DIMM sockets support
* Supports 8/16/32/64/128 MB DIMM Module
* Supports EDO RAM, SDRAM (Support ECC, 72 bit)
* Supports 8MB to 768MB DRAM Size
* Supports 66/66.8/75/83.3/95/100/105/110/115/120 MHz System Clock Speed Setting
* Supports 1.5--5.0 Multiplier Setting
|Posted on Tuesday, November 19, 2002 - 4:48 am: |
No, the motherboard is listed as supporting up to a 550mhz + amd k6-2, k6-3, k6-2+, or k6-3+ up to 600 mhz.
The bios has to be updated, but after that the manufacturer claims it supports those chips. It recognizes the chip just fine on boot.
|Posted on Tuesday, November 19, 2002 - 10:23 am: |
Manufacturers don't always tell the whole truth. Some motherboards may work up to 600mhz, but that doesn't mean all motherboards do. I've ran into this problem more than once.
I would suggest trying to reduce to different fsb speeds to see if it will stableize.
|Posted on Tuesday, November 19, 2002 - 9:53 pm: |
The P5A does indeed support the 550 just fine, It may take a little fine tuning in the bios tho with that geforce card and power usage, You said you started out with a 350 MHZ and jumped into a 550 MHZ so power consumption may be an issue. What is the wattage of your PSU?
|Posted on Sunday, December 1, 2002 - 3:17 am: |
The k6-2+ doesn't work at any speed at all, even at 200 mhz it's completely unstable, leading me to think it's chip/mb related and not power supply related. The power supply is 400W and brand new, it can certainly handle the load.
I've tried the beta bios (which recognizes the chip but is unstable) and the bios release just before that (which will not boot the k6-2+).
I've played with the core voltage and gone from 2.0 to 2.4 with no effect on stability.
Here's a weird one though. In the bios, I disabled the internal cache entirely and the chip runs fine and is completely stable using the beta bios. It's also EXTREMELY slow, even at 550 mhz it's far slower than the k6-2 350 using the internal cache.
|Posted on Sunday, December 1, 2002 - 8:21 pm: |
Sounds like you got a chip with bad internal cache if it is stabile disabled. A little reflection back to the good old days, the K62 had L1 on chip and used L2 on the mainboard. The K63 and K62+ had L2 on the chip so Cache on the mainboard actually became L3 if this helps the diagnosis any.