Quick FSB:RAM ratio and overclocking question

[caleb2001r]

If your PC-3200 DRR memory is underclocked to 166mhz due to 5:4 ratio with a 533mhz processor (don't ask), can one realistically expect to OC the cpu to bring the memory back to 200mhz as rated while still on a 5:4 ratio and not cause problems?

Note: Assuming CPU temps ok, and chip has a known overclocking potential.

 

[Arcygenical]

Yep, should be fine.

 

[caleb2001r]

What if when doing this it causes the computer to reboot before hitting windows, even crash when it makes it in?

The only thing I can think of is that the mobo has the memory timings on Auto. Perhaps it's changing them and I should manually configure?

 

[caleb2001r]

I was successfully able to get the memory up to 187mhz, but I think I found my problem. It looks like the motherboard I have does not support DDR400, so hitting 200mhz makes the motherboard crap out.

MSI says the 865 only supports up to DDR333. This could be my problem no?

 

[BinarySynapse]

I was successfully able to get the memory up to 187mhz, but I think I found my problem. It looks like the motherboard I have does not support DDR400, so hitting 200mhz makes the motherboard crap out.

MSI says the 865 only supports up to DDR333. This could be my problem no?

Are we talking the Intel i865 chipset? It does indeed support DDR-400. However MSI's bios may not though. And ia 533MHz processor? I assume that's the CPU's FSB speed.

 

[[BRO]Alaskan]

Without knowing exactly what motherboard you have its tough to answer but yes that is probably it.

 

[caleb2001r]

Are we talking the Intel i865 chipset? It does indeed support DDR-400. However MSI's bios may not though. And ia 533MHz processor? I assume that's the CPU's FSB speed.

Here's a snapshot of CPUZ.

It's the i865, so I guess the bios doesn't support it. Yes, it's a Pentium D 805 so only 533 FSB.

Without knowing exactly what motherboard you have its tough to answer but yes that is probably it.

The motherboard is the MSI MS-7101. It's the only I found with a brand I recognized that was affordable and support AGP, DDR, and IDE and not SATA (haven't upgraded that just yet).

 

[BinarySynapse]

When you say 187MHz, is that your FSB or memory clock speed?

 

[caleb2001r]

When you say 187MHz, is that your FSB or memory clock speed?

That's my memory clock speed now. I know it's rated for 200mhz since it's DDR400, but the processor is only a 533FSB so the motherboard ran the cpu:dram at a 5:4 ratio. Hence at stock speeds, my processor was at 133mhz, and the memory was at 166mhz.

I hope I'm not confusing you guys! I need to brush up on my terminology.

 

[BinarySynapse]

That's my memory clock speed now. I know it's rated for 200mhz since it's DDR400, but the processor is only a 533FSB so the motherboard ran the cpu:dram at a 5:4 ratio. Hence at stock speeds, my processor was at 133mhz, and the memory was at 166mhz.

I hope I'm not confusing you guys! I need to brush up on my terminology.

Ok, so if you're still using the 5:4 divider than you FSB is at ~150MHz. that may be the limit the i865 has on the 133 strap.

 

[caleb2001r]

Ok, so if you're still using the 5:4 divider than you FSB is at ~150MHz. that may be the limit the i865 has on the 133 strap.

Gotcha. My motherboard gives me the option to go to 165, but the highest I've tried is 160Mhz to make the processor got to 3.2ghz, and memory at 200mhz, but it won't get to the windows loading screen.

Backed down to 155Mhz and it gave me a blue screen repeatedly.

150mhz has been stable all day today playing BF2, with CPU temps not breaking 50 degrees or so.