I just installed my Asus P4S533 Motherboard with a P4 2.26 Northwood chip. I also bought Samsung PC3200 Xtreme DDR400 memory.
Question: How do I know if my memory is running at DDR400?
I saw a BIOS setting "CPU/MEMORY FREQUENCY RATIO" and I have no idea what it does (the doc is CRAP)
When this is set to "AUTO" my computer won't post, so I set the ratio to 1:1 and it runs great.
Can anyone please help me understand:
Front Side Bus
As I understood it, my FSB is 133 and my CPU bus is 4 times that at 533. I have no idea how to determine the memory bus.
right now, your memory is running at 133 mhz (266 ddr @ cpu:mem ratio 1:1).
since your ram is rated at pc3200 (ddr400)...it should be able to do 4:6...
anyways...lemme see if i can explain the mem ratios to you...
the P4S533 has the following cpu:mem ratios:
@ FSB < 133:
1:1, 3:4, 3:5 and 3:6.
@ FSB >= 133:
1:1, 4:3, 4:5 and 4:6.
since you have the P4 "B" with 133 FSB...ill talk about the cpu:mem ratios at 133 FSB (1:1, 4:3, 4:5, 4:6).
consider this equation:
CPU FSB / (CPU in CPU:MEMORY ratio) x (MEMORY in CPU:MEMORY ratio) = memory speed
133 / 1 x 1 = 133
so your ram is running at 133mhz (266ddr).
in your case, you should have your ratio at 4:6 because your ram is rated to run at that speed (ddr400)...if it cannot, then try a slower speed like 4:5...if your comp still wont post, then you may want to consider getting new ram...
Wow thanks pr497!!!
That really helped me allot. I now have my memory running at 333Mhz, but can't get it to post at 400. Not sure what the problem is there, the memory should handle it.
Anyway, I'm pretty happy with 333Mhz.
Oh, can anyone recommend a good system spec display?
I would like the SEE the 333Mhz for the memory.
I looked around in Sandra and didn't see where it displayed the memory speed.
Most mainboards aren't really "designed" to work with DDR400 so you may have to increase memory voltage in order to get it to work. Before you do this, however, I'd make sure you have a good power supply and definitely some RAM sinks to cool down your RAM as those things generate a lot of heat. Gone are the days when memory was only 5 degrees above room temperature.
This little cathode light of mine, I'm gonna let it shine!