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Half multipliers added to OC Optimizer page!

I'm assuming these are the correct divider speeds:

DRAM MEMCLK Frequency (MemClk)
111b 24/24 * 200 = 200.00MHz aka 1:1
110b 22/24 * 200 = 183.33MHz aka 9:10 (it's 11:12)
101b 20/24 * 200 = 166.66MHz aka 5:6
100b 18/24 * 200 = 150.00MHz aka 3:4
011b 17/24 * 200 = 141.66MHz aka 7:10 (it's 17:24)
010b 16/24 * 200 = 133.33MHz aka 2:3
001b 15/24 * 200 = 125.00MHz aka 3:5 (it's 5:8)
000b 12/24 * 200 = 100.00MHz aka 1:2
 
It's not accurate. My CPU is at 2.6 GHz (236x11) and I have my memory divider at 166 and my real memory speed is 185-186 MHz. Not 162 as that table suggests.
 
Originally posted by: Jeff7181
It's not accurate. My CPU is at 2.6 GHz (236x11) and I have my memory divider at 166 and my real memory speed is 185-186 MHz. Not 162 as that table suggests.
Click to expand...

Thats what he has:

236 11 x 236 = 2596 5:6(166) x 236 = 185.42
 
Originally posted by: Zebo
Originally posted by: Jeff7181
It's not accurate. My CPU is at 2.6 GHz (236x11) and I have my memory divider at 166 and my real memory speed is 185-186 MHz. Not 162 as that table suggests.
Click to expand...

Thats what he has:

236 11 x 236 = 2596 5:6(166) x 236 = 185.42
Click to expand...

The table in the OP's link isn't accurate is what I meant.
 
Pfew 😵;; lol i was calculating my ass off back here .. i get 185.4285714285714285753936536593755590729Mhz to be accurate 😛
 
ok, it seems the memory speed is actually derived from the core frequency divided by an integer.

11*236 / 12 for example

In the bios the dividers available are totally different though

The real divider for 5:6(166) and an 11x multiplier is calculated by doing: (ceil means rounding up)
11*200 / 166.666666 = 13.2
ceil ( 13.2 ) = 14

So for the 11x multiplier and a 166.66 memory divider the REAL memory divider is actually 14

To get the memory speed you divide the cpu speed by it
11*236 / 14 = 185.42MHz
 
Ok, this looks interesting. How about if I have 1.7Ghz cpu and then I set the multiplier at x17 and then I'm using a PC2100 2x256 memory sticks? What should be the divider? I set it up at 2.5-3-3-6 2T. This is an Intel set-up. Teach me MASTER!!!! I'm going to get AMD for gaming. Is the Intel calculation same on AMD?
 
Originally posted by: Gogar
Pfew 😵;; lol i was calculating my ass off back here .. i get 185.4285714285714285753936536593755590729Mhz to be accurate 😛
Click to expand...


Oh I see. Your talking about AMD, I see that you're also having a hard time calculating it that's why you can't help me with the Intel.

 
Originally posted by: cornholio2
Originally posted by: Gogar
Pfew 😵;; lol i was calculating my ass off back here .. i get 185.4285714285714285753936536593755590729Mhz to be accurate 😛
Click to expand...


Oh I see. Your talking about AMD, I see that you're also having a hard time calculating it that's why you can't help me with the Intel.
Click to expand...

He's not having a hard time with anything. You're having a hard time understanding what's going on here. The Athlon 64 is the ONLY processor that figures the memory speed based on the CPU core speed because the memory controller is on die and the FSB doesn't really exist anymore, which is what all previous processors (for all intents and purposes) have used to figure memory speed.
 
Oh, ok so AMD is different in configuring the mem speed and cpu frquency? I'm a noob in OC that's why I want to learn more. Is AMD and DFI-Ultra D using the same principle? So if you're a MASTER, then TEACH ME MASTER!!TEACH ME!! I wish there's a book like OVERCLOCKING FOR DUMMIES.
 
I'm rather confused Gogar, as the equation doesn't seem to work out based on my settings. I am running an A 3200 @ 2510 (251 x 10). Following your formula, 2510/166.666 yeilds an answer of 15.06~. If you divide 2510 by the 15.06~, you get a memory speed of 167.3~. According to CPU-Z, my ram with my current DDR 333 divider (166) is running @ 209.3mhz..The bandwidth tests seem to indicate the ram is indeed running @ 209, as my Sisoft reults are over 6200. Am I missing something here?
 
You're dividing by the cpu frequency with a raised HTT. You should calculate the real memory divider from 10 * 200 / 166.66 which yields 12 exactly so no rounding up required
then you take your cpu frequency as it is with your raised HTT 251*10 / 12 = 209.16MHz 🙂
 
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