quick question beginner OC

A

apcor

Limp Gawd
Joined
Feb 24, 2005
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I just gave a tiny bump to CPU 100mz (2.5GHZ from 2.4). Under DRAM my memclock idex value reads 400mhz which is what it was when I was at 2.4ghz. Is my ram oc'd as well. I have read the stickys and I would have thought that my ram would be clocked higher now that CPU is higher. I raised cpu freq from 200 to 210 (I think at is what is supposed to be the HTT). Is there something I am missing?
 
yes, but I have not seen anything in the bios that would allow me to adjust or set(or it is labeled something else in my bios). Unless it is just something I have to account for when setting ram speed vs cpu. I just took it as given the default value is 1:1

gwai lo said:
Do you know what your RAM ratio is?
Click to expand...
 
If it's set 1:1 then basically your RAM will clock itself to whatever the HTT is set at (before taking the 2x from being DDR into account). If you're RAM doesn't overclock well, then use a divider to keep your OC stable (by offsetting how much the RAM OCs in line with the CPU).

If you haven't read it then you might want to look this over: http://hardforum.com/showpost.php?p=1027479689&postcount=2
 
Thanks - I understand that part. Problem is that I dont see anything in my bios that lets me set a ratio. I am only assuming it is 1:1. I looked at all my options in CPU {DRAM CONFIG} and Jumper Free and I just dont see it. I dont know if it is an option on my mobo unless they all have it. Btw I suspect by a divider you mean hardware that is on the RAM which I also suspect I do not have. Using Value RAM

Volkum said:
If it's set 1:1 then basically your RAM will clock itself to whatever the HTT is set at (before taking the 2x from being DDR into account). If you're RAM doesn't overclock well, then use a divider to keep your OC stable (by offsetting how much the RAM OCs in line with the CPU).

If you haven't read it then you might want to look this over: http://hardforum.com/showpost.php?p=1027479689&postcount=2
Click to expand...
 
yeah... took me a while to figure that out also.

basically, 400 is 1:1, 333 is 5:6... so on and so forth. you have to do some math to realize what those numbers are saying, but basically divide 400 by the numbers you see int he dram speed and you get your ratio.

i think my nforce4 had settings from 466 - 200.
 
OK methinks I gets it - thanks.

But shouldnt I try to raise the DRAM speed higher before using a divider (check stability). Then raise CPU frequency to the desired speed. If that fails then use divider?

says in sticky ratios are not the ideal soln
 
Check out the AMD sub forum..and so far it sounds like the on-die memory controller doesn't require 1:1 for ideal performance any more. P4's and AXP's are bandwidth starved, but the A64's aren't in the same position.

 
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