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How do I calculate my FSB:DRAM ratio

post #1 of 14
Thread Starter 
I get a bit confused about this question now
I clocked my RAM frequency at 1066Mhz under dual channel configuration, and FSB @ 1333Mhz
This is also the default setting if I link the FSB with DRAM as 5:4 under BIOS, but my CPU-Z shows my FSBRAM ratio as 5:8, since it takes only the single channel frequency in count.
what is the correct one?
Edited by esufkc - 2/20/09 at 2:23am
    
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post #2 of 14
First off, I think you mean MHz, secondly you should always do 1:1 for maximum stability.
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post #3 of 14
Hi there!
Your DRAM frequency is 533.9 MHz
Your Bus Speed is 333
Your Rated FSB is 1333 MHz

To calculate FSB-DRAM
1333/533= 2.5
1333/333= 4

FSB-DRAM
2.5:4 = 5:8

Somone correct me if im wrong but I believe this is how you calculate your ratio.
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post #4 of 14
Thread Starter 
Quote:
Originally Posted by coollettuce View Post
First off, I think you mean MHz, secondly you should always do 1:1 for maximum stability.
Thanks for correcting me, but do i still get extra performance out of CPU if the fsb/dram exceeds1?

Quote:
Originally Posted by ekser87 View Post
Hi there!
Your DRAM frequency is 533.9 MHz
Your Bus Speed is 333
Your Rated FSB is 1333 MHz

To calculate FSB-DRAM
1333/533= 2.5
1333/333= 4

FSB-DRAM
2.5:4 = 5:8

Somone correct me if im wrong but I believe this is how you calculate your ratio.
Thanks mate, I think this is what I am asking for!
    
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post #5 of 14
Quote:
Originally Posted by ekser87 View Post
Hi there!
Your DRAM frequency is 533.9 MHz
Your Bus Speed is 333
Your Rated FSB is 1333 MHz

To calculate FSB-DRAM
1333/533= 2.5
1333/333= 4

FSB-DRAM
2.5:4 = 5:8

Somone correct me if im wrong but I believe this is how you calculate your ratio.
This is spot on. FSB is "quad pumped" on Intel (socket 775) systems. 333MHz (1333 / 4) is the FSB you should calculate the ratio with, as esker has shown. DDR2 is doubled, so 533MHz (1066 / 2) is the DRAM frequency you should calculate the ratio with, as well.

333MHz FSB : 533MHz DRAM = 5:8 FSB: DRAM ratio
Edited by Choggs396 - 2/20/09 at 2:38am
    
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post #6 of 14
If your FSB is at 1333 with a 10x multiplier, then the FSB is 333.25MHz. The FSB is Quad-Pumped, so you divide 1333 by 4. And then you multiply that by 10.

As for getting more or less performance with different ratios, not really. It's more about stability. It's said that it's a little easier to achieve stability at 1:1 than with other ratios. However, I prefer to leave my memory Unlinked and overclock it as I see fit, or leave it at stock and play with the timings. I don't like things being automated so much.

My ratio is 10:9 right now, but it's stable.
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post #7 of 14
Thread Starter 
You guys really help me out a lot , REP+ for each of you.
By the way, I noticed programs under windows more often to crash since i overclocked my system, does that mean the system is not stable yet since the overclock? seems like I shall do some more work to increase the stability,
    
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post #8 of 14
Quote:
Originally Posted by esufkc View Post
You guys really help me out a lot , REP+ for each of you.
By the way, I noticed programs under windows more often to crash since i overclocked my system, does that mean the system is not stable yet since the overclock? seems like I shall do some more work to increase the stability,
You can test stability with the Prime 95 program. (Scroll down to "Step 3" on the webpage, and download the correct version.) There are multiple tests you can run with P95. I've noticed the "Small FFT's" test stresses the CPU the most and gives me the highest temps. The "Blend Test" will stress RAM to some degree, as well as the CPU. In any case, I stress 10-20 minutes between overclocks, and 8 hours plus for my "final" OC to insure stability.

You can also run the Intel Burn Test. *Warning* ... this will put extreme stress on your CPU and temps will generally be very high. From my experiences, you only have to do 10-20 passes max in order to test stability. It's a harsh test, but takes relatively little time compared to P95. (1 pass generally takes only a couple minutes).

For RAM stability, try Memtest86. (More info). You'll download an ISO image (which you burn to a CD), then boot with it. The test will load upon boot. Let it run one pass for testing purposes. For your "final" overclock, I would let it run for 30 min to an hour to make sure.
    
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post #9 of 14
Quote:
Originally Posted by esufkc View Post
You guys really help me out a lot , REP+ for each of you.
By the way, I noticed programs under windows more often to crash since i overclocked my system, does that mean the system is not stable yet since the overclock? seems like I shall do some more work to increase the stability,
Yeah, it does mean it's not stable. You can test the stability with Prime95 which will definitely test all 4 cores. I'm not sure, but OCCT may as well. But I know Prime95 will. Orthos will not. Well, I tried it on a Q6600, and no matter how many simultaneous instances I ran of Orthos, it still only stressed 2 cores.

Your memory may be unstable as well. You can test it with Memtest (either Memtest 2.11 from www.memtest.org, or Memtest86+ 3.5 from www.memtest86.com). It's strongly recommended to run that for 3-5 hours or more. It will automatically do repeated passes of 8 tests total. If it passes all 8 tests, it is considered 1 pass. 10 passes is kind of preferred. Oh, and just before you start Memtest 3.5, it will provide you with 3 options: Single CPU, Multiple CPUs (Experimental), or Memtest 3.4. Select Multiple CPUs since they actually meant "cores".

Speaking of your memory, what's your memory's stock speed? If it's 800, then 1066MHz might be stretching it too far. But then again, it might not. When you're focusing on testing your memory, it's also very important to run Prime95 using the Blend test.

Also, do you have a vdroop control in the BIOS? If so, then set that so there's no vdroop. Vdroop is when the voltage droops under load. I think you have to enable vdroop control.

Also, it has been recommended to me to disable the following in BIOS:
  • Spread Spectrum
  • Intel SpeedStep (or EIST, or Enhanced Intel Speed Step)
  • C1E Enhanced Halt State
That's about all I can think of right now.
Edited by TwoCables - 2/20/09 at 3:10am
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post #10 of 14
Quote:
Originally Posted by esufkc View Post
By the way, I noticed programs under windows more often to crash since i overclocked my system, does that mean the system is not stable yet since the overclock? seems like I shall do some more work to increase the stability,
Yeah, that means it's not a fully stable overclock. Try running prime95 or IBT like Choggs suggested. Make sure your cooling is working real good on the second one.
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