little overclock help :(

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I've just overclocked my main rig a little, it's not much (AMD Athlon 64 3200+ ClawHammer) from 2000mhz to 2420mhz.

It's really annoying me because the board will hit 300 FSB fine and I can get into windows at 300 fsb with a divider on the memory to keep it within it's stock speed.

The problem is that I can't put the CPU multiplier back up to 10x :( I have to keep it around 8x (300*8=2400). At 9 or 10 it gets stuck during the POST.

Simply put I can't seem to get it up to 2500 mhz or further no matter what combination of FSB, Divider and Multiplier I use :(

I've got maximum voltage through CPU, RAM and Chipset.

CPU stock voltage is 1.5. The motherboard is set to 1.7 volts and it's currently measuring 1.79 - 1.8.

Memory is upped from 2.6 - 2.8 volts and chipset has an extra 0.3 volts.

I ran a Prime Small FFT Torture Test for 27minutes with no errors, though the Power/Aux temp reported in SiSoftware Sandra Lite was 47 - 57C
 
I am happy with 2420 but if theres anyway I could get a little more then I'd be very happy, 2500 would be a nice round number :)

It's got 1.74-1.8 volts going through it that should mean it could go a little faster?

Well the board defaults to 3*200FSB=600HTT
I've got it at 242*2.5=605.

SiSoftware Sandra Lite reports:
Chipset 2
Model : Advanced Micro Devices (AMD) Athlon 64 / Opteron HyperTransport Technology Configuration
Bus(es) : AGP PCI USB FireWire/1394 i2c/SMBus
Version : 1.02
Front Side Bus Speed : 2x 605MHz (1210MHz data rate)
Maximum FSB Speed / Max Memory Speed : 2x 1000MHz / 2x 200MHz
In/Out Width : 8-bit / 16-bit
IO Queue Depth : 8 request(s)

However even at completely stock speeds I can't get the HTT multiplier up to 5x to create that 1000? Is Sandra reporting incorrectly?
 
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