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ram settings?

post #1 of 4
Thread Starter 
hi there i have just overclocked my rig for the first time and have set my ram at 5-5-5-18 as it states on the sticks and have also set it to 333/800 but wot dose the 333/800 mean?? can i damage my ram?& could some1 explane this to me please?

ps im a noob
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post #2 of 4
333/800? Can you be more specific please? What was the setting called that you chose 333/800?

My guess without further info: that's an option for the FSB : DIMM ratio. In other words, if your FSB is set to 333MHz, then it will run your RAM at 400MHz, or DDR2 800. Hence the 333 represents the FSB and the 800 represents DDR2 800. It's important to note that this is just a ratio, it's not directly controlling the speed of the FSB or the memory, just establishing a FSB : DIMM ratio of 5:6. So if you set your FSB to 266MHz, the memory will run at 320MHz (266*6/5), or DDR2 640 speeds. If you set your FSB to 400MHz, the memory would run at 480MHz (400*6/5), or DDR2 960 speeds. Make sense?

Please give us more info on what the option is called in your BIOS though, and what the available options are. Also please let me know what your FSB is currently set to, and what voltage you're giving your memory. Also, is this your memory? If so, it likes 1.9v, so make sure you're giving it exactly that.

By the way, you know you're in the AMD memory section right...

EDIT: If your board is anything like mine, it has the same ratio for different FSB's. For example, there might be another ratio option that mathematically works out to the same 5/6 ratio, but instead of 333/800 it might be 266/640. Even though the ratio is mathematically equal, the board wants you to run the 266/640 option if your FSB is close to 266MHz, and wants you to run the 333/800 if the FSB is close to 333MHz. It adds stability for some reason.
Edited by durch - 12/24/08 at 9:38am
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post #3 of 4
Thread Starter 
sry for the rubbish info the setting i went into was called dram speed setting and i just picked 333/800 cos im a noob and i dont know wot im doing.lol. my cpu is at 3.0@ fsb of 1333 but wen it was standard it was 1066 @2.4. so how do u controle the speed of the ram i can type the dram timings out in wot ever i want to cos it allows my to and i have already given the ram its required 1.9v. also i read the best devider is 1:1 so that would be 400/800 byt why? sorry if i sound stupid but im really interested in this whole new side to pc's and want to learn. cheers
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post #4 of 4
Well this is a great place to learn

Ok, your FSB is what's called "quad-pumped". So originally it was running at a "quad-pumped" speed of 1066MHz. You have to divide that by 4 to get the actual frequency of the FSB. 1066/4 = 266MHz. You have overclocked the FSB to 1333MHz. 1333/4 = 333MHz, which is the actual frequency of the FSB right now.

DDR and DDR2 memory are "double-data rate", so memory running at DDR2 800 is actually running at 800/2 = 400MHz. It was a marketing gimmick back when DDR was launched to compare slow SDRAM to the new fast DDR memory that transferred data both on the rise and fall of the signal. So DDR memory running at 200MHz would actually give twice the bandwidth as SDRAM running at 200MHz. They thus called it DDR 400 memory, because it was the equivalent of SDRAM running at 400MHz.

As I explained in my previous post, the 333/800 means if the actual FSB frequency is 333MHz (which it is as I just explained), then your memory will be running at DDR2 800 speeds. And as I just explained, DDR2 800 speeds means the memory is running at 400MHz. Now this does not "lock" your FSB at 333Mhz or the memory at 400MHz. It's just a weird way of saying that the computer is setting a relationship between the FSB and memory speed equal to 333/400 = 5/6. So for every 5MHz of FSB speed, it will set 6MHz of memory speed. In other words, you can now find your memory speed by taking the FSB speed and multiplying it by 6/5. So if you increase the FSB from 333MHz to 338MHz (a 5MHz increase), your RAM will go from 400MHz to 406MHz (a 6MHz increase) which would give you DDR2 812 speeds. Make sense?

As for the 1:1 ratio being best, that's true to a certain extent. You definitely want the RAM running at least as fast as the FSB or you will lose performance. You currently have the RAM running a little faster than the FSB, which is perfectly ok. As long as the RAM is running as fast as the FSB or faster, you're good to go.

As for damaging your RAM, the only real way to do that is if you overvolt it too much, so don't give it more than 1.9v and you're fine. However, if you increase the RAM speed too much, your system might not post due to instability. This doesn't hurt the RAM, but you'll have to reset the CMOS and start from scratch with your overclock if this happens. Since the RAM speed goes up as the FSB goes up, make sure you increase the FSB in small increments and stress test with Prime95 after an increase to check for stability.

Keep pushing that CPU further! CPU speed is the most important factor in a good overclock.
Edited by durch - 12/24/08 at 5:45pm
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White Whale
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