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CPU OC difference between DDR400 and say DDR 500

post #1 of 8
Thread Starter 
ok, so say i wanna overclock a new X2 3800+. its got a 10x multi and stock 200mhz FSB, right? why do so many people who wanna overclock this use DDR 400 which runs at 200mhz FSB, instead of using DDR500 or higher that would easily allow 250mhz FSB and theoretically you to hit 2.5 with the CPU? wouldnt the most intelligent purchase be the memory that is rated to run stock at a higher speed so that you dont have to push the memory and possibly void the memory warrantee? i really dont understand. if any of what i said is incorrect, please set me straight.
    
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post #2 of 8
Quote:
Originally Posted by SKAnk9915
ok, so say i wanna overclock a new X2 3800+. its got a 10x multi and stock 200mhz FSB, right? why do so many people who wanna overclock this use DDR 400 which runs at 200mhz FSB, instead of using DDR500 or higher that would easily allow 250mhz FSB and theoretically you to hit 2.5 with the CPU? wouldnt the most intelligent purchase be the memory that is rated to run stock at a higher speed so that you dont have to push the memory and possibly void the memory warrantee? i really dont understand. if any of what i said is incorrect, please set me straight.
If I buy DDR 400 memory and overclock it, how is anyone going to know? See my point, the warranty wouldn't be voided unless you stuck a note to it informing them that you did. Btw, memory won't affect your cpu OC because you can run a divider if your memory can't keep up with 1:1 ratio.
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post #3 of 8
Thread Starter 
does running a divider in any way affect performance, and if your really really super lazy, and you have money, wouldnt it be easier to just buy faster memory? or do the memory timings themselves make more of a difference?
    
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post #4 of 8
Quote:
Originally Posted by SKAnk9915
does running a divider in any way affect performance, and if your really really super lazy, and you have money, wouldnt it be easier to just buy faster memory? or do the memory timings themselves make more of a difference?
As far as buying faster memory, there is plenty of DDR400 that will run at DDR500, Crucial Ballistix is one of them. It's just that DDR500 is guaranteed to run at that speed, it's a crapshoot with DDR400. I'm not sure I'm understanding your question right, but I want to make clear that DDR500 doesn't run at 250 FSB automatically, you have to set it to that speed in BIOS, if you don't it's gonna run at the same ole DDR400 speed. I don't know your experience level, so if it seems condescending for me to say that, I'm sorry.

As far as timings making a difference, DDR400 that will run at 500MHz usually does so at the same timings that rated DDR500 does. My experience with this has only been with Crucial, however. Others may vary. How much of an effect timing has I'm not totally sure,(I.E. will DDR400 at 2-2-2-5 prove better than DDR 480@3-4-4-8?) but someone here probably has an exact figure on how much faster you'd have to run memory to overcome the effect of timing on bandwidth. The consensus seems to be that MHz rule when it comes to memory, so if you can run high speed and tight timings then more power to you, but most here seem to prefer to run the RAM as fast as it will go, even if the timings are loose. I remember having seen memory bandwidth tests with SiSoft Sandra in some memory reviews, and higher speed always had higher bandwidth than slower speeds with tighter timings.

Running a divider doesn't negatively impact performance on an Athlon 64, but you don't get the added benefit of the higher FSB once you stop jacking it up. It is always preferable to run at a 1:1 FSB at the limits of your CPU, that way not only is your processor turning more clocks, but your RAM is transferring data faster, too. But if your CPU has the ability to go a little higher, but your RAM is maxed out, then it's time to look into running a memory divider, if it's that important to you. But if you had two identical setups, both at the same CPU speed, one with the memory at a 1:1 with the FSB at say 500MHz, and the other one running the memory on a divider at 400MHz, you would find that setup A running at 1:1 is indeed faster, and would score higher in benchmarks and the like.

P.S. I love your avatar, I'm a big Subie fan!!
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post #5 of 8
Thread Starter 
ok, thank you, that mostly answered my question. yes, i knew that DDR 500 wouldnt automatically run at 250 FSB, no offense taken. i was just confused as to why most people seemed to have DDR400, other than a slight price difference. so DDR500 would probably be the way to go, since you dont have to push it to reach anything over 200 FSB, and its kindof guaranteed, right? at least up tp 250 FSB. subies for life.
    
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post #6 of 8
Yeah, if you're not concerned about price, you may as well go with DDR500. At least you are sure before you throw it in that it will at least run 250 FSB. You should definitely go with the 500 if you are planning on buying a 2x1GB setup, as not all 1GB sticks will overclock well (see my RAM choice, it's totally maxed out at 227 MHz, no matter what timings or voltages). So I guess that's that, just go for the best advertised timings at DDR500 you can find.

-Sean
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post #7 of 8
Thread Starter 
thanks alot man, you rock. any advice on what kindof memory to get? i know the asus boards can be picky, and thats prolly what ill end up getting. prolly should start a new post
    
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post #8 of 8
Quote:
Originally Posted by RyeDaddy
Yeah, if you're not concerned about price, you may as well go with DDR500. At least you are sure before you throw it in that it will at least run 250 FSB. You should definitely go with the 500 if you are planning on buying a 2x1GB setup, as not all 1GB sticks will overclock well (see my RAM choice, it's totally maxed out at 227 MHz, no matter what timings or voltages). So I guess that's that, just go for the best advertised timings at DDR500 you can find.

-Sean
Actually, if you raise to CAS3, you should hit over 240 and almost 250. Those sticks should max out at CAS 2.5 at 230. I run mine at 230, but have seen them stable over 240.
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