C566 FCPGA won't overclock. What gives?

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09-19-2000, 01:35 PM
panin

C566 FCPGA won't overclock. What gives?

I bought one of those so called 'pretested' Celeron 566 FCPGA which the seller claimed it can run at 850/100, but I can't get that speed at my system. I tried to yank up the v-core to 1.8v and still no go. I can only clock it at 708/83, and that runs fine at 1.5v v-core. What gives? Anyone else have same experience? Help please.

Will a better HSF help?

If it matters at all, here's the list of all my hardware.
Hardware:
C566 FCPGA
Asus CUBX
Enlight 7237
Micron 128 Cas2 SDRAM
Golden Orb
WD Expert 7200rpm 20 Gig
All PCI cards run fine at 41 Mhz PCI bus speed
Soundblaster AWE 64 ISA
09-19-2000, 01:43 PM
mpitts

Quote:

Originally posted by panin:
I bought one of those so called 'pretested' Celeron 566 FCPGA which the seller claimed it can run at 850/100, but I can't get that speed at my system. I tried to yank up the v-core to 1.8v and still no go. I can only clock it at 708/83, and that runs fine at 1.5v v-core. What gives? Anyone else have same experience? Help please.

Will a better HSF help?

If it matters at all, here's the list of all my hardware.
Hardware:
C566 FCPGA
Asus CUBX
Enlight 7237
Micron 128 Cas2 SDRAM
Golden Orb
WD Expert 7200rpm 20 Gig
All PCI cards run fine at 41 Mhz PCI bus speed
Soundblaster AWE 64 ISA

Make sure the Orb is seated well on the CPU and that you are using Thermal Paste. Have you gotten a temperature reading from the CPU at 708?

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"Everyone knows the best bands are affiliated with Satan."
09-19-2000, 02:05 PM
panin

I'm already using thermal paste, although not sure if it's a good one

Asus PC probe gives temp reading which range from 26-29 C.
09-19-2000, 02:25 PM
mpitts

Quote:

Originally posted by panin:
I'm already using thermal paste, although not sure if it's a good one

Asus PC probe gives temp reading which range from 26-29 C.

Hmm.. You say CAS2 RAM.. Is it PC100?

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"Everyone knows the best bands are affiliated with Satan."
09-19-2000, 03:11 PM
panin

PC-100 it is.

BTW, the temp reading above is when the system's running at 708/83.
09-19-2000, 03:15 PM
mpitts

Quote:

Originally posted by panin:
PC-100 it is.

BTW, the temp reading above is when the system's running at 708/83.

Hmm.. I really don't have any other suggestions for you right now. I wish I could help.. Have you tried the CPU on a different board? Or a different CPU on the CUBX?

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"Everyone knows the best bands are affiliated with Satan."
09-19-2000, 05:44 PM
scary_jeff

mine does this too on cubx, the same hardware, same temp @ 708 @ 1.5, but no 850 :.(, even @ 1.8!, wont even post!
maybee its something with the board cos sandra says something like max CPU = 800, so maybee nothing past 800 works? that would be good cos that would be fixed by a bios update
09-19-2000, 09:47 PM
panin

Quote:

Originally posted by scary_jeff:
mine does this too on cubx, the same hardware, same temp @ 708 @ 1.5, but no 850 :.(, even @ 1.8!, wont even post!
maybee its something with the board cos sandra says something like max CPU = 800, so maybee nothing past 800 works? that would be good cos that would be fixed by a bios update

SCary_Jeff: So umm, what you're trying to say is that we should wait till the next BIOS update??

I'm pretty clueless about this sandra thing, when you say max cpu=800, does this mean, the board won't recognize those 800Mhz CPUs and above?
09-19-2000, 11:23 PM
mpitts

Quote:

Originally posted by panin:
SCary_Jeff: So umm, what you're trying to say is that we should wait till the next BIOS update??

I'm pretty clueless about this sandra thing, when you say max cpu=800, does this mean, the board won't recognize those 800Mhz CPUs and above?

If his board is exhibiting the same behavior as yours, it may be a pretty safe bet that it is the MB. Contact ASUS and ask them what the fastest CPU that can run on your board is.

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"Everyone knows the best bands are affiliated with Satan."
09-20-2000, 02:26 PM
demc

Quote:

Originally posted by panin:
I bought one of those so called 'pretested' Celeron 566 FCPGA which the seller claimed it can run at 850/100, but I can't get that speed at my system. I tried to yank up the v-core to 1.8v and still no go. I can only clock it at 708/83, and that runs fine at 1.5v v-core. What gives? Anyone else have same experience? Help please.

Will a better HSF help?

If it matters at all, here's the list of all my hardware.
Hardware:
C566 FCPGA
Asus CUBX
Enlight 7237
Micron 128 Cas2 SDRAM
Golden Orb
WD Expert 7200rpm 20 Gig
All PCI cards run fine at 41 Mhz PCI bus speed
Soundblaster AWE 64 ISA

By clocking the fsb to 83 you're also clocking the ram up proportionately. I had the same problem and figured out it was my ram limiting me.
Switch the ratio from 66:100:33 to 100:100:33 and you SHOULD be able to hit that magic 850.
09-20-2000, 03:20 PM
mpitts

Quote:

Originally posted by demc:
By clocking the fsb to 83 you're also clocking the ram up proportionately. I had the same problem and figured out it was my ram limiting me.
Switch the ratio from 66:100:33 to 100:100:33 and you SHOULD be able to hit that magic 850.

With the PC100 he has, won't it be running at 83Mhz if the FSB is, or does the CUBX allow you to run the RAM and FSB at different speeds?

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"Everyone knows the best bands are affiliated with Satan."
09-20-2000, 08:17 PM
panin

Quote:

Originally posted by mpitts:

With the PC100 he has, won't it be running at 83Mhz if the FSB is, or does the CUBX allow you to run the RAM and FSB at different speeds?

Yea, I thought the speed of RAM = speed of FSB. I don't find anywhere in the BIOS where I can adjust the speed of the RAM independently, at least that's what I know. Is it in the timing, and CAS delay??
09-21-2000, 05:34 AM
spanky2k

To hit 850 with my cu-celery 566 I had to up the voltage to 2.1 (may be 2.2, can't remember). I had to buy a decent slotket converter because my previous lame unbranded one could do sod all voltage. I got an Abit SlotKET!!! which can whoop up the voltage to like 2.9 or something ridiculous like that.
09-26-2000, 09:21 PM
sapasion

If it was pre-tested do you have a guarantee? If so, just get a new one. Not every 566 will do 850, but if it was pre-tested it definitely should, that's why they charged you probably 40% more $$.
09-27-2000, 05:08 AM
irwin

same here my 566 wont post at 850Mhz i have an aopen ax64pro via mobo.
09-27-2000, 09:12 AM
mpitts

Quote:

Originally posted by spanky2k:
To hit 850 with my cu-celery 566 I had to up the voltage to 2.1 (may be 2.2, can't remember). I had to buy a decent slotket converter because my previous lame unbranded one could do sod all voltage. I got an Abit SlotKET!!! which can whoop up the voltage to like 2.9 or something ridiculous like that.

Holy crap, that is high! 2.1/2.2 on the Coppermine core Celeron's can NOT be good for it..

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"Everyone knows the best bands are affiliated with Satan."
09-27-2000, 09:13 AM
mpitts

Quote:

Originally posted by sapasion:
If it was pre-tested do you have a guarantee? If so, just get a new one. Not every 566 will do 850, but if it was pre-tested it definitely should, that's why they charged you probably 40% more $$.

I totally agree with this. What is the point of paying the extra $$ if you aren't going to get the returns you paid for?

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"Everyone knows the best bands are affiliated with Satan."
09-27-2000, 11:03 AM
Emthon

Usually the pretested CPU sites mention the system that they guarantee the overclock. I had some difficulty o'clocking my guaranteed CPU to 935mhz (Cel2-566). However, I was running the fine edge of overclocking my AGP GF-2 MX at the same time. I finally got everything stable at 922mhz cpu and 190 mem/ 195 core on the MX. Not too shabby! BTW, a key ingredient for the cpu was getting the voltage to 1.85v .
L8r,
Em