|You didn't list anything about the system you're asking about but I know it's not an "Abit Nf7-s2 motherboard" & "Athlon XP 2400+ OC". It would help to know exactly what you're referring to.|
"But if the cpu is not OC'd i.e. its running at the rated fsb of 800Mhz(200x4) then wouldn't it automaticallybe running the memory at 400Mhz(ddr3 - 200x2) ?"
Generally, if the BIOS settings aren't manually configured, both the CPU & RAM will run at their default speeds. And to make things easier/clearer, please refer to actual frequencies, not the bullsh!t QDR & DDR ratings.
"So this would be a 1:2 DRAM:FSB ratio, right ?"
The ratio is CPU frequency:DRAM frequency, not the other way around. But in the example above (fsb of 800Mhz(200x4) / memory at 400Mhz(ddr3 - 200x2)), the ratio would be 1:1 because both the CPU & RAM are running at 200MHz frequency.
Are you sure what your wrote is correct? Could it be CPU at 800MHz FSB (200MHz frequency) & DDR3 at 800MHz (400MHz frequency)? Because that would be 200:400, in other words,1:2.
"What's throwing me off is that CPUID is reporting 1:2 ratio, but why does Everest Ultimate report the DRAM:FSB ratio as 12:6 then ? Can you please help me understand this ? Thanks!"
CPUID is reporting the ratio correctly - CPU:DRAM. It appears Everest has it backwards - DRAM:CPU. But if you reduce 12:6 to 2:1 (which is the same thing), then reverse the order, you have 1:2.