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Pentium D 820- Need some info please. - Page 2

post #11 of 17
dont i still ask questions too lol but i dont know, i think youll be pretty good on a 1:1 but yes..you will run into a wall and need to run a divider sooner or later
    
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post #12 of 17
running a divider allows the CPU and RAM speeds to run synchronised
for example:
if you run at 200 FSB
1:1, they are the same, 200:200 ddr2-400
4:5 Cpu is at 200 and ram is at 250 ddr3-500
2:3 cpu is at 200 and ram is at 300 ddr2-600
1:2 cpu is at 200 and ram is at 400, ddr2-800
ther wil be weird ones like 18:11 and stuff too

the extra speed on the ram allows for extra memory bandwidth, ECC uses that
but there really any preformance gain, except to keep things stable

if you overclock your fsb to say 270 or higher. start running a 1:1 divider,
and just experimentwith them a little bit, just dont clock your ram too high,
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post #13 of 17
Thread Starter 
Well atm I am only going to try for 3.5GHz once I read up more and get my new hardware. But thanks allot for the info, I'm starting to understand it finally.

And one more question. I have DDR2-533 RAM now does that mean it's running at 266MHz? If so does that mean I could set my FSB to 266 before I have to run a divider or change my RAM speeds or am I completely wrong here? If I'm wrong I'll just forget what I said and continue to read up in guides. lol After this I wont bother you all anymore.
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post #14 of 17
well,
your memory increases with the fsb at the same time so if you up the fsb to 266, which would be a pretty good oc btw, but if you up it there the memory wont be 266 it will increase 66mhz (or the number you increase your fsb by)

but if you run the divider 1 or 2 down from its original speed (depends)
it will oc from there and you can bring your ram up with your cpu
    
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post #15 of 17
You should have good luck, you have a good board and a nice CPU, but the RAM will likely hold you back the most, especially if it's cheap stuff like you said. You will be running it at it's stock speeds to achieve 1:1 at around 3.7, which means you will likely have stock timings. To go 1:1 at higher than 3.7 on the CPU, you would have to overclock that RAM, and cheap stuff doesn;t take kindly to overclocking, and of course, you will have to loosen the timings more to get faster RAM speeds.......

The 9xx series Pentium Ds overclock like mad, the 8xx seires are supposed to be very good (havent played with one myself) but not as good as a 9xx series. With your board and 820, and RAM, I would say 3.5 would be a good goal to try for, but you never know till you try.

Keeping your CPU under 55c is a good general guideline, but it is always best to check the exact thermal specs for your CPU.

Intel Processor Spec Sheet


I checked, and both revisions of your CPU, the A0 and B0 have the same thermal spec and voltage spec.

64.1c and 1.4v max.

So, you want to try to keep it at 55c or under, but it can go to a little over 60c before throttling occurs. With a BT, you shouldn't have much trouble with that.

I'd be very interested in how your OC works out as I have only played with the VM version of your board with an old 533 bus Prescott, I'd love to hear how far the P5LD2 will go with a higher end CPU.
post #16 of 17
Thread Starter 
Oh alright, so if I understand what you're saying (low chance on that, I'm nott hat smart) is that I might not even have to run a divider to get 3.5GHz? Also I will tell you my results when I get the hardware and know wth I'm doing. hehe

So far I know that to OC an intel you raise the FSB and when it fails to boot the OS you raise the voltages a little bit and try again. I still have a few more guides I've found that I am gong to read.
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post #17 of 17
If you run the Ram 1:1 with the cpu at stock sppeds the ram will run at 200mhz. then as you increase the cpu the ram will increase. So lets say you get your computer OC'ed to 266*14 your ram will be running at 266mhz its "actual" speed. That is the reason for buying ram with a higher bus speed than the cpu it gives you head room to work with w/o running a divider. I am curently running my ram faster than my FSB the ram is 378mhz and my CPu fsb is 268. This is a =nother plus for the faster memory when you hit a wall you can set your memory to a higher frequency which with DDR2 is supposed to have improvement ( where as with DDR you want to run a 1:1 ratio). also I believe you won't get past 3.8ghz unfortunately, with your processor due to it being an 8xx series. although that is still a very good OC. If you need any help don't hesitate to ask anyone on the forum that is why we are all here to share info.


EDIT - I concur with thumper he just beat me to the punch!

PS - just to clarify when OC'ing be sure not to raise the FSB by too much at any time, try 3-5 points at a time until reach instability then go back to your last stable OC and increase by one at a time. after that try increasing your vcore a notch and see if you can go any higher. I just thought i'd through that in there as a reminder. Don't want anyone frying there brand new cpu!
    
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