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Help Overcloking a P4 - 3.06 skt 478 - Page 4

post #31 of 35
whats good ddr ram that will hit ddr 700 speeds? im looking to get my fsb up to 300
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post #32 of 35
Thread Starter 
Quote:
Originally Posted by Taeric
The PC number is just a rating of the stock speed of the RAM. To get the equivalent DDR number, divide by 8 (e.g. PC3200 = DDR400). For overclocking you want either 1) good overclocking RAM that has stock speed equal to your CPU's stock speed or 2) decent RAM with stock speed faster than the CPU's stock speed. Case (1) relies on the RAM to overclock along with the CPU, and high quality RAM is needed in order to get the additional bandwith required for a stable overclock. Case (2) uses the "extra" capacity of the RAM (i.e. the difference between the stock speed of the RAM and the stock speed of the CPU) to allow the CPU to overclock before the stock speed of the RAM is reached. Either way will allow for a good OC. The key in picking RAM is determining your expected overclock and matching the RAM you buy to your overclocking goal. There's no need to buy RAM that runs at DDR700 if you're only going to OC to DDR500 level; conversley, if you want to OC to DDR600 speeds, getting RAM that tops out at DDR500 is a waste as well.
=) when you say equal to cpu speed what do you mean (the Bus? or the 3200mhz clock?) My cpu is 3.2 // fsb 139 // BUS 555 , my ram is a 2700... is it that big of a bottleneck? wich one would you recomend... (please consider 2 things - a) A good ram for overclocking now // b) a good ram for overcloking now and future good overcloking potencial for an AMD i will someday hopefully this year own ) i will consider buying a) or b) acording to the price range xD
post #33 of 35
what hes talking about is the bus speed before its quad pumped... so if your current cpu is a 533fsb, then your current fsb is 133.x or something like that. if you get ddr400, then that means that this ram supports a 200fsb at its stock levels. if you get ddr500, that can support up to 250fsb without being overclocked. i have ddr500, and it barely supports over 250fsb and will definately NOT run at anything higher then ddr400. im going to sell this garbage and get some good stuff.
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post #34 of 35
FSB (for P4s) is not 100 MHz, 133 MHz, or 200 MHz as is commonly stated; that's the external clock speed. To get FSB (again, on P4s), multiply by 4 (as they're quad pumped), so P4 FSB is 400 MHz, 533 MHz, or 800 MHz (with some 1066 MHz ones at the high end of the range).

For what I was suggesting, compare the external clock speed of your CPU with the speed of the RAM (DDR rating/2 or PC rating/16). As was stated above, your CPU runs at 133 MHz at stock. In my opinion, it's not worthwhile to buy PC2100 to match that. Your best bet is likely to go with PC3200 (200 MHz). That means you can overclock your CPU 50% before you reach the stock speed of the RAM. Since PC2100 is getting old, the price of it isn't all that different than the more common PC3200. Plus, should you decide to go with a 200 MHz processor in the future, you can use PC3200 without a hitch.
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post #35 of 35
i sit and watched a buddy of mine fiddling with a 3.06 mobile chip, and overclocked it to an unbelievable 5.44 air cooled at 55C!!!!! Hince the reason why I own the same mobo but, i don't do 533 cpu's anymore, won't ever compare to the hyperthreading portion of the higher end cpu's, let alone the 1066 fsb cpu's out now.....if ya need more info i would be glad to help out, just post it.....i've been at the overclocking business for a long while now, kinda pro, and haven't lost a single hardware piece of any sort yet.....needless to say the asus p4s800d-x mobo is the s*it for oc'ing.
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