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Memory Auto Frequency question (orig. in memory section)

Last response: in Overclocking
January 30, 2008 9:48:16 PM

I posted this in the wrong section earlier. I meant to do it in the overclocking section. Just ignore the other one.

I'm trying my hand at overclocking and followed some instructions I got from a post on Toms Hardware. I'm kind of confused on the memory frequency though. I'm running twin sticks of Crucial Ballistix DDR2 800. According to the post, I should set the system memory multiplier to 2.00. If I do that, the frequency drops ridiculously low. If I leave it on Auto, it goes from 800 to 960 if I change the CPU Frequency from 200 to 240. Which is correct? Should I leave it on Auto? What's the highest the memory frequency should be allowed to go?

By the way I also dropped the timings back from 4-4-4-12 to 5-5-5-15. Is that a good idea, or should I stick with the lower latency? Voltage is at 2.20.

January 30, 2008 9:55:45 PM

Keep the timings loose for the time being...once stable put it back to 4-4-4-12 if you can.

For the memory frequency it is based on your FSB frequency. At 200 with a 2.0 multiplier (all 2.0 means is 1:1, personally for the 800 FSB chips I dont use it) it would make the Ram 400 which is low. Auto will do 4 times so 200 x 4 = 800 and 240 x 4 = 960. For the time being do a multiplier that keeps the Ram at or below 800 and then once done with the CPU do Ram overclocking if you want
January 30, 2008 11:26:08 PM

How high can you usually go with the RAM?
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January 31, 2008 12:01:40 AM

Okay, I don't get it. I just changed my CPU FSB to 240. I then took my Memory Frequency off of Auto and put it at 3.33. My BIOS said that made it's frequency 799. Which matches what Silverion77 says. 3.33 times 240 equals 799.2. I booted the computer and launched CPU-Z. It shows the CPU at 2640.0 MHz with a FSB of 960. I clicked the Memory tab and it shows my memory at 400 MHz and FSB:D RAM at 3:5. Shouldn't it be showing 799 MHz? I don't know what the FSB:D RAM is.
January 31, 2008 1:15:34 AM

FSB is quad pumped so 240 will be 960 (240 x 4)
Memory is dual pumped and CPU is based on the multiplier. (11)

So at 240 FSB, then it would be 960 FSB cpu is 2640 (11 x 240) and Ram is 800 (about, it probably rounded it)
January 31, 2008 1:18:46 AM

Theoretically, there is no difference between 1:1 vs. any other ratio. You just got to tweak the timings correctly.
January 31, 2008 1:38:54 AM

Yeah, I get that part, but why is the Memory tab of CPUID showing 400? Shouldn't it be showing 800? It was showing 960 when I had BIOS set to Auto.
January 31, 2008 2:10:57 AM

it shows 400 because its not dual pumpes...mine only shows like 338 i think
January 31, 2008 8:50:45 AM

I could have sworn it said 960 when I had it set to auto.