4:5 multiplier on epox 4g4a+?

[cj420]

i have a 4g4A+ board with p4 2.0A cpu (400 bus) and 512 DDR 333. I can't find the setting to enable 333 memory, it will only default to DDR 2100 (266 mhz). I tried removing (open) cpu clock select jumper, but this results in no boot. Is this combination possible?

 

[LastRide]

You have to overclock your memory to get 333 or higher on the 4G4A+.I bought the P4B533 and have to do the same thing.The P4B533-V and some other boards will run your memory at 333 without overclocking it.I'm new at O/Cing so someone else can help you out or run a search and check out some posts.

 

[P4spooky]

Try this:

Remove JP1 (All open)
Set FSB to 133
This will allow you to select DDR333 (Auto) setting for memory in the BIOS.

Thanks,

 

[LastRide]

P4spooky,does this work for the P5B533 aswell?.

 

[cj420]

p4spooky,

that makes sense, but if i remove the jumper (open), system won't boot. it is set at auto (cpu select), which is 100. do I have to o'clk the fsb to get the proper memory speed? I don't want to fry the cpu, I'm only using stock heatsink and fan (p4). any more info would be greatly appreciated.

 

[P4spooky]

I have heard that 2.0A is not a very good overclocker.

I have a 1.6A on this board running at 2.5Ghz (156FSB) and memory at (156/4*5)*2=DDR390. Vcore at 1.6V and Vmem at 2.8 Corsair XMS-3200. I was unable to go beyond 144FSB with JP1 shorting pins 1&2. Removed it, got the 4:5 divider and had better luck overclocking.

You may want to increase FSB in small steps and keeping memory at 1:1 until you have hit the overclocking limit on the processor.
To summerize from personal experience:

1. Better chance of overclock with JP1 open
2. Worst chance of overclock with JP1 (pins 2&3 shorted)
3. Slightly better chance with JP1 (pins 1&2 shorted) - much lower FSB than option-1.

Memory on second bank.

Lastride: Sorry I don't have the P4B533 so I don't know.
Hope this helps.

 

[crapito]

cj420: there are 2 ways to get your RAM to DDR333 (2x166MHz) with a 2.0a CPU (20x100MHz FSB)...

1) on the 100MHz FSB setting, ie jumper on: hit 125MHz FSB (x20=2500MHz)with the RAM multipler at 3:4 -> 166MHz/DDR333
2) on the 133MHz FSB setting, ie jumper off: hit 133MHz FSB (x20=2660MHz)with the RAM multipler at 4:5 -> 166MHz/DDR333

thus, at a minimum, your CPU has to be able to hit 2500MHz. try the 100MHz FSB setting and work up to 125MHz+, cause that's the magic (minimum) number for you...

tips on overclocking:
1) RAM in slot 2 (middle)
2) AGP/PCI bus locked at 66/33
3) up to ~1.75 CPUv (+0.25v)

and P4spooky is definitely right: the "2.0A is not a very good overclocker. "