P5A won't post at bus speeds > 83MHz

[Alex]

Configuration:
Asus P5A Motherboard rev 1.06 (http://www.asus.com/pub/asus/mb/sock7/ali/p5a/p5a-107.pdf), BIOS version 1011.005 (latest)
AMD K5-2/400 CPU
256MB dual sided PC133 DIMM. 16 chips "MT48LC16M8A2-75C" (http://download.micron.com/pdf/datasheets/dram/sdram/128msdram_f.pdf)

Everything else removed or disconnected.

Problem:
POSTs fine if I set the jumpers to a speed of no higher than 83MHz. Any higher than that - will not POST (on powerup will beep repeatedly every 2/3 of a second).

Please help me figure out what's wrong.

Thanks in advance,
Alex.

 

[Egil Solberg]

Configuration:
Asus P5A Motherboard rev 1.06

(http://www.asus.com/pub/asus/mb/sock7/ali/p5a/p5a-107.pdf), BIOS version
1011.005 (latest)

AMD K5-2/400 CPU
256MB dual sided PC133 DIMM. 16 chips "MT48LC16M8A2-75C" (http://download.micron.com/pdf/datasheets/dram/sdram/128msdram_f.pdf)

Everything else removed or disconnected.

Problem:
POSTs fine if I set the jumpers to a speed of no higher than 83MHz. Any

higher than that - will not POST (on powerup will beep repeatedly every 2/3
of a second).

Please help me figure out what's wrong.

How have you set the multiplier-jumpers?
What happens if you set the multiplier lower, let's say 3,0 or 3,5 and with
100MHz bus? Does it work now?

 

[Alex]

(http://www.asus.com/pub/asus/mb/sock7/ali/p5a/p5a-107.pdf), BIOS version 1011.005 (latest)

higher than that - will not POST (on powerup will beep repeatedly every 2/3
of a second).


How have you set the multiplier-jumpers?
What happens if you set the multiplier lower, let's say 3,0 or 3,5 and with
100MHz bus? Does it work now?

The multiplier setting does not affect the behaviour.
I tried it with 4, 3 and 2.5 - POSTs with lower bus speed, beeps on higher.

Best regards,
Alex

 

[JAD]

your PSU is verified OK?

Configuration:
Asus P5A Motherboard rev 1.06 (http://www.asus.com/pub/asus/mb/sock7/ali/p5a/p5a-107.pdf), BIOS version 1011.005 (latest)
AMD K5-2/400 CPU
256MB dual sided PC133 DIMM. 16 chips "MT48LC16M8A2-75C" (http://download.micron.com/pdf/datasheets/dram/sdram/128msdram_f.pdf)

Everything else removed or disconnected.

Problem:
POSTs fine if I set the jumpers to a speed of no higher than 83MHz. Any higher than that - will not POST (on powerup will beep
repeatedly every 2/3 of a second).

Please help me figure out what's wrong.

Thanks in advance,
Alex.

 

[Alex]

your PSU is verified OK?

Should be. why?

Configuration:
Asus P5A Motherboard rev 1.06 (http://www.asus.com/pub/asus/mb/sock7/ali/p5a/p5a-107.pdf), BIOS version 1011.005 (latest)
AMD K5-2/400 CPU
256MB dual sided PC133 DIMM. 16 chips "MT48LC16M8A2-5C" (http://download.micron.com/pdf/datasheets/dram/sdram/128msdram_f.pdf)

Everything else removed or disconnected.

Problem:
POSTs fine if I set the jumpers to a speed of no higher than 83MHz. Any higher than that - will not POST (on powerup will beep
repeatedly every 2/3 of a second).

Please help me figure out what's wrong.

Thanks in advance,
Alex.

Best regards,
Alex

 

[JAD]

well its not 100% guarantee but usually when I can't run the chip at spec or above and I have ruled out memory, its turned out to be
the PSU can't keep up.

your PSU is verified OK?

Should be. why?

Configuration:
Asus P5A Motherboard rev 1.06 (http://www.asus.com/pub/asus/mb/sock7/ali/p5a/p5a-107.pdf), BIOS version 1011.005 (latest)
AMD K5-2/400 CPU
256MB dual sided PC133 DIMM. 16 chips "MT48LC16M8A2-5C" (http://download.micron.com/pdf/datasheets/dram/sdram/128msdram_f.pdf)

Everything else removed or disconnected.

Problem:
POSTs fine if I set the jumpers to a speed of no higher than 83MHz. Any higher than that - will not POST (on powerup will beep
repeatedly every 2/3 of a second).

Please help me figure out what's wrong.

Thanks in advance,
Alex.

Best regards,
Alex

 

[BoB]

Clear cmos, make sure cas is set to 3!

Configuration:
Asus P5A Motherboard rev 1.06
(http://www.asus.com/pub/asus/mb/sock7/ali/p5a/p5a-107.pdf), BIOS version
1011.005 (latest)
AMD K5-2/400 CPU
256MB dual sided PC133 DIMM. 16 chips "MT48LC16M8A2-75C"
(http://download.micron.com/pdf/datasheets/dram/sdram/128msdram_f.pdf)

Everything else removed or disconnected.

Problem:
POSTs fine if I set the jumpers to a speed of no higher than 83MHz. Any
higher than that - will not POST (on powerup will beep repeatedly every 2/3
of a second).

Please help me figure out what's wrong.

Thanks in advance,
Alex.

 

[Rob]

Might be a long shot but I haven't read in your posts what you have set
the Vcore at. Also don't know if you have cleared the CMOS(RTC), the
procedure is in the manual but I would add to it, unplug the PC before
beginning.

 

[Ralph Wade Phillips]

Howdy!

Configuration:
Asus P5A Motherboard rev 1.06
(http://www.asus.com/pub/asus/mb/sock7/ali/p5a/p5a-107.pdf), BIOS version
1011.005 (latest)
AMD K5-2/400 CPU
256MB dual sided PC133 DIMM. 16 chips "MT48LC16M8A2-75C"
(http://download.micron.com/pdf/datasheets/dram/sdram/128msdram_f.pdf)

Everything else removed or disconnected.

Problem:
POSTs fine if I set the jumpers to a speed of no higher than 83MHz. Any
higher than that - will not POST (on powerup will beep repeatedly every 2/3
of a second).

Please help me figure out what's wrong.

The chipset is only guaranteed to 66MHz.

I'd take the money and run, myself. That is, leave it at 75Mhz or
83MHz and run it.

RwP

 

[BoB]

Howdy!

Configuration:
Asus P5A Motherboard rev 1.06
(http://www.asus.com/pub/asus/mb/sock7/ali/p5a/p5a-107.pdf), BIOS version
1011.005 (latest)
AMD K5-2/400 CPU
256MB dual sided PC133 DIMM. 16 chips "MT48LC16M8A2-75C"
(http://download.micron.com/pdf/datasheets/dram/sdram/128msdram_f.pdf)

Everything else removed or disconnected.

Problem:
POSTs fine if I set the jumpers to a speed of no higher than 83MHz. Any
higher than that - will not POST (on powerup will beep repeatedly every 2/3
of a second).

Please help me figure out what's wrong.

The chipset is only guaranteed to 66MHz.

I'd take the money and run, myself. That is, leave it at 75Mhz or
83MHz and run it.

RwP

k6-2/100mghz run fine at 66mghz, flaky at 75 or 83!
I ran 350's or 400's at 366(max multiplier).
He's got bad ram or bios set to cas2!!!!!!!!!!!!!!!!
Just cause it worked in another computer don't mean shit!!!!!!!!!

 

[Alex]

well its not 100% guarantee but usually when I can't run the chip at spec or above and I have ruled out memory, its turned out to be
the PSU can't keep up.

It's a 200W PSU that was running an Intel Agate board with a P-MMX/200 (@66x3) full of PCI & ISA cards and drives for the last 4-5 years with no problems. For the P5A, I removed all the cards and disconnected all the drives so there should be no excessive power load.

I haven't ruled out the memory yet, it is just not the prime suspect at this time.

 

[Alex]

Might be a long shot but I haven't read in your posts what you have set
the Vcore at.
2.2v

Also don't know if you have cleared the CMOS(RTC), the
procedure is in the manual but I would add to it, unplug the PC before
beginning.

Yep.
I also booted (at lower bus speed), flashed the latest BIOS and told it to load the setup defaults.

 

[Alex]

Clear cmos, make sure cas is set to 3!

Will try but would you care to explain why?

 

[Alex]

The chipset is only guaranteed to 66MHz.

I'd take the money and run, myself. That is, leave it at 75Mhz or 83MHz and run it.

No, the chipset supports 100MHz. Says so in the manual.
http://www.asus.com/pub/asus/mb/sock7/ali/p5a/p5a-107.pdf

Best regards,
Alex

 

[JAD]

no no no.... I am not referring to the 12v rail(powers the drives).....but the power circuit to the CPU. 4-5 years pulling that
load....I suspect the PSU..

well its not 100% guarantee but usually when I can't run the chip at spec or above and I have ruled out memory, its turned out to be
the PSU can't keep up.

It's a 200W PSU that was running an Intel Agate board with a P-MMX/200 (@66x3) full of PCI & ISA cards and drives for the last 4-5
years with no problems. For the P5A, I removed all the cards and disconnected all the drives so there should be no excessive power
load.

I haven't ruled out the memory yet, it is just not the prime suspect at this time.

 

[BoB]

If bios is set to cas 2(fast memory timing) and you insert pc133
memory that only does cas3(slow memory timing) at 100mghz
the computer won't boot! ctspd, as I told you in the earlier thread
will tell you about the memory!
Just because a certain stick of ram works in one mobo, that
doesn't mean squat in different mobo!
Cheap memory at 133 won't do cas 2 at 100mghz!
It will almost always do cas2 at 66mghz, that's what I am
guessing is your problem!

Clear cmos, make sure cas is set to 3!

Will try but would you care to explain why?

 

[Alex]

Thank you all!

The problem was with the RAM. Swapped the Micron for an Infineon and voila! - works OK.
Even seems to work at CAS2 (the memory is PC133-7.5) although I have not tested it extensively.

Now I just have to figure out why my SB16 ISA (Actually a Vibra16 + Wave Blaster) is not recognized...

 

[JAD]

have you set 'legacy' IRQ for the ISA slot? or exclusions.. all depends on bios make...

Thank you all!

The problem was with the RAM. Swapped the Micron for an Infineon and voila! - works OK.
Even seems to work at CAS2 (the memory is PC133-7.5) although I have not tested it extensively.

Now I just have to figure out why my SB16 ISA (Actually a Vibra16 + Wave Blaster) is not recognized...

 

[Alex]

have you set 'legacy' IRQ for the ISA slot? or exclusions.. all depends on bios make...

The BIOS is based on AWARD 4.51-PG.

On the previous board the card was set as: I/O=220h, IRQ=5, DMA=1, High-DMA=5
I tried setting the "used by ISA" IRQ5, DMA1 and DMA5 to "Yes" and to "No/ICU". No effect.

DIAGNOSE.EXE fails when trying to detect the I/O setting.

 

[JAD]

in the bios (along with an IRQ that isn't shared if possible)...

reset configuration data to YES
PnP OS installed to NO

is there anything in the PCI slot above the ISA where the SC is?

have you set 'legacy' IRQ for the ISA slot? or exclusions.. all depends on bios make...

The BIOS is based on AWARD 4.51-PG.

On the previous board the card was set as: I/O=220h, IRQ=5, DMA=1, High-DMA=5
I tried setting the "used by ISA" IRQ5, DMA1 and DMA5 to "Yes" and to "No/ICU". No effect.

DIAGNOSE.EXE fails when trying to detect the I/O setting.