G
Guest
Guest
Archived from groups: alt.comp.hardware.overclocking.amd (More info?)
Hi People,
I am overclocking my new system:
MSI Neo2 Platinum
Athlon 64 3000+ Winchester
2 x Corsair 512MB XMS CL2 PC400
Arctic Freezer 64
For my first experiments I set:
CPU mult = 9x
DDR maxclock = 133MHz
PCI/AGP = 66MHz
HT mult = 3x
With this I started looking at different configurations of Vcore
and FSB (hence CPU Freq.). I am pretty much at the beginning
but I plotted an x-y chart of the results so far. Using survival of
the most intensive Prime 95 test for 12 iterations as a criteria, the
red points represent unstable configurations and the blue points
stable configurations:
http://home.arcor.de/david_ffm/oc_res1.jpg
Now it looks to me as if there is a curve close to linear separating
the stable from the unstable area, but that it has a lid on it somewhere
near 2500MHz. Up to this point I didn't need to increase Vcore much,
but above this point even larger increases in Vcore didn't seem to help
stability at all. This suggested to me that something other than the CPU
was causing problems above FSB 275 MHz, so to test this hypothesis
I took a configuration that was just unstable (FSB 285 MHz) and
reduced the CPU multiplier to 6x, so that it was well below spec. This
was also unstable which seems to confirm my idea. But what else could be
causing problems? RAM and HT should be well within spec in this config.
Could it be the board itself?
Now something else weird: the config as above with
CPU mult = 6x and FSB = 275 MHz (CPU 1650 MHz)
is unstable (P95 error after a few minutes at most).
But the IDENTICAL config with CPU mult = 9x (CPU 2475 MHz)
is stable! At least it has survived over 4 hours of P95 torture!
How is that possible? Is the CPU multiplier of 9 particularly
favourable for some reason?
I'm not hell-bent on getting the very last MHz out of this CPU,
but I feel that since I got to 2475 MHz with little effort, moderate
Vcore increase, and reasonable temperatures, it would be a pity
to stop there because of what seems to be a problem with some
other unidentified component.
It seems to me that a higher CPU multiplier would be a good way
to go - is there any (not too risky) way of hacking the lock on that?
I'd be most grateful for any thoughts on these issues or advice,
especially since this is my first go at overclocking!
TIA
David
Hi People,
I am overclocking my new system:
MSI Neo2 Platinum
Athlon 64 3000+ Winchester
2 x Corsair 512MB XMS CL2 PC400
Arctic Freezer 64
For my first experiments I set:
CPU mult = 9x
DDR maxclock = 133MHz
PCI/AGP = 66MHz
HT mult = 3x
With this I started looking at different configurations of Vcore
and FSB (hence CPU Freq.). I am pretty much at the beginning
but I plotted an x-y chart of the results so far. Using survival of
the most intensive Prime 95 test for 12 iterations as a criteria, the
red points represent unstable configurations and the blue points
stable configurations:
http://home.arcor.de/david_ffm/oc_res1.jpg
Now it looks to me as if there is a curve close to linear separating
the stable from the unstable area, but that it has a lid on it somewhere
near 2500MHz. Up to this point I didn't need to increase Vcore much,
but above this point even larger increases in Vcore didn't seem to help
stability at all. This suggested to me that something other than the CPU
was causing problems above FSB 275 MHz, so to test this hypothesis
I took a configuration that was just unstable (FSB 285 MHz) and
reduced the CPU multiplier to 6x, so that it was well below spec. This
was also unstable which seems to confirm my idea. But what else could be
causing problems? RAM and HT should be well within spec in this config.
Could it be the board itself?
Now something else weird: the config as above with
CPU mult = 6x and FSB = 275 MHz (CPU 1650 MHz)
is unstable (P95 error after a few minutes at most).
But the IDENTICAL config with CPU mult = 9x (CPU 2475 MHz)
is stable! At least it has survived over 4 hours of P95 torture!
How is that possible? Is the CPU multiplier of 9 particularly
favourable for some reason?
I'm not hell-bent on getting the very last MHz out of this CPU,
but I feel that since I got to 2475 MHz with little effort, moderate
Vcore increase, and reasonable temperatures, it would be a pity
to stop there because of what seems to be a problem with some
other unidentified component.
It seems to me that a higher CPU multiplier would be a good way
to go - is there any (not too risky) way of hacking the lock on that?
I'd be most grateful for any thoughts on these issues or advice,
especially since this is my first go at overclocking!
TIA
David