RAM timings automatically increased due to ov

June 24, 2010 at 20:46:27
Specs: WINDOWS VISTA ULTIMATE, PENTIUM 4 3066 Mhz
Hi,
the default FSB of my CPU is 533 mhz(P4 524) but the maximum operating freq for the ram is 800 mhz. so naturally the ram operates at 533mhz. i checked through cpuZ software that while in default clock-rate the ram timings remain at 4-4-4-12. but when i overclock the CPU to reach an fsb of 560mhz the timings are increased by the system to 6-6-6-18. then the ram though operates at 560mhz. my question is why the timings change or rather increase? i can manually set the timings at a lower value..but will it hurt my overclocked system anyway?

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#1
June 24, 2010 at 21:29:04
The P4 is based on the outdated & inefficient netburst architecture & performs best when the RAM frequency is higher than the CPU frequency. The prefered CPU:DRAM frequency ratio for a 533MHz FSB P4 is 4:5 (all other P4s should be run at 3:4). The key to understanding the ratio is understanding what "frequency" is.

533MHz is a bogus number based on quad data rate (QDR) technology...the true bus speed (aka frequency) is actually 133MHz (533/4). RAM ratings are based on double data rate (DDR) technology. Knowing that the ideal ratio for your CPU is 4:5 & that its default freq is 133MHz, you can determine the ideal RAM freq simply by dividing the CPU freq by 4/5. In other words:

CPU at 133MHz (533MHz) : RAM at 166MHz (333MHz)
CPU at 140MHz (560MHz) : RAM at 175MHz (350MHz)

So what you *should* be doing is underclocking your RAM & manually tightening the timimngs.


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#2
June 24, 2010 at 22:16:37
hmmm...i got your point jam but how could i underclock the ram? i think there is no useful setting to do this. the motherboard is GA-G31MES2L. i see there is an option called memory multiplier in the bios but it remains constant at 4X all the time. if anything else could be done please suggest.

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#3
June 24, 2010 at 22:36:52
What are the options in MB Intelligent Tweaker(M.I.T.), System Memory Multiplier (SPD), and Memory Frequency (Mhz)?

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Related Solutions

#4
June 24, 2010 at 23:45:03
in memory frequency there is only one option i.e. 533mhz.
memory multiplier- 4X (no other option except it)

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#5
June 25, 2010 at 09:01:26
For a 533mhz system bus, run the RAM at 533mhz. This is QDR on a 64bit channel,


As for the RAM overclocking itself, this is due to changing the FSB settings, which will in turn OC the RAM. The key is to set the ram lower before you overclock the system, then set the RAM speed back to normal after the overclock.

PowerMac 9600(1 ghz G4)
512mb RAM
50gb SCSI
ATi 9200 PCI


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#6
June 25, 2010 at 09:39:09
@Outlander...
Read response # 1. It's all explained there.

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#7
June 25, 2010 at 09:54:33
"the motherboard is GA-G31MES2L"

What you should do is get rid of that piece of sh!t processor & get one that will allow you to take full advantage of your motherboard & RAM.


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#8
June 25, 2010 at 10:09:47
That reminds me. My neighbor chucked an old case on the curb this morning missing side panels and faceplate.

But; with an ABit IC7, P4C 2.4 Northwood, and a 9700Pro that all work! Wonder if I can get another Ghz out of that thng?

Now returning control of this thread to pentium524.

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#9
June 25, 2010 at 10:24:13
I have a couple old Northwoods here that worked when I pulled them. Kept meaning to do something with them and forgot about them :(.

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#10
June 25, 2010 at 10:54:42
Someone needs to throw away some PC4000 or PC4400 memory now. :-)

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