Basic ram OC question

Reneki

Reneki

New Member
I'm getting a q6600, with these ram --> http://canadacomputers.com/index.php?do=ShowProduct&cmd=pd&pid=013789&cid=RAM.835

Now, i've read that when you OC the cpu fsb, it does it in sync with the ram. So, if by default the q6600 comes in at 333Mhz, the ram will be brought down to that speed?

And if i were to raise the cpu fsb, to say 400, it will still be within the rams specs? Cause the rams rated at ddr2 800, that means 400Mhz, right?

So the purpose of high quality ddr2 ram is just so that i could break that 400Mhz mark, and oc the ram better at higher speeds? (and get good timings in the process)
 
i'm interested in this as i am just getting into overclocking. the way i understand is that to get the full 800mhz out of the ram you have to set the fsb to 800 mhz and set the core multiplier to 3 to get the standart 2.4 ghz that the q6600 runs at. and then to go higher its a better idea to leave the core multiplier and raise the fsb, because lowering the fsb and raising the core multiplier will overclock the processor but it will hurt the ram's performance.

am i right?

edit: ok i think i am wrong
 
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Your RAM clocking will move proportionally. So if you have DDR2-667, every 1MHz you increase on the FSB will increase the RAM by 1MHz as well. But for the sake of easy math, if you have DDR2-1000, every 1MHz of FSB you increase your RAM will go up by 1.5MHz.

It all depends on what your memory divider/multiplier is.
 
ahhh, so the processor and memory will run at the proper fsb speed (say 200mhz for my p4 and 800 mhz for my new ram) and then overclocking by 2 mhz it would go up to 202 mhz and 802.
 
DDR2-800 really runs at 400MHz. So in terms of the DDR speed it would be 804MHz.

Sorry, I kind of screwed up there, I listed the DDR speed but then used the actual speed for the math.

Luckily most new BIOSs will tell you what speed the CPU and RAM will be running at when you increase the FSB. But if yours doesn't all you have to remember is what the ratio is between your RAM speed and FSB. Then you can figure it out your self as you go.
 
Probably a little of both :D

Your question was somewhat related though so it's ok.

My numbers in post 3 are based on 333MHz FSB, I seem to have mixed the original post into it without specifying what FSB it was based on. I think you asked about 800MHz FSB (really 200MHz, but it's quad data rate).
 
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